martin.kleppmann.com Open in urlscan Pro
188.114.97.3 Public Scan

Go To Rescan
Add Verdict Report

URL:
https://martin.kleppmann.com/2016/02/08/how-to-do-distributed-locking.html
Submission: On October 21 via api (October 21st 2024, 2:36:26 am UTC) from RU — Scanned from NL

Summary HTTP 35 Redirects Links 55 Behaviour Indicators

Summary

This website contacted 8 IPs in 3 countries across 6 domains to perform 35 HTTP transactions. The main IP is 188.114.97.3, located in Amsterdam, Netherlands and belongs to CLOUDFLARENET, US. The main domain is martin.kleppmann.com.
TLS certificate: Issued by WE1 on September 24th 2024. Valid for: 3 months.

This is the only time martin.kleppmann.com was scanned on urlscan.io!

urlscan.io Verdict: No classification

Domain & IP information

	IP Address	AS Autonomous System
21	188.114.97.3 188.114.97.3	13335 (CLOUDFLAR...) (CLOUDFLARENET)
1	2606:4700:20:... 2606:4700:20::681a:ddc	13335 (CLOUDFLAR...) (CLOUDFLARENET)
1	172.64.150.56 172.64.150.56	13335 (CLOUDFLAR...) (CLOUDFLARENET)
5	199.232.192.134 199.232.192.134	54113 (FASTLY) (FASTLY)
2	104.17.24.14 104.17.24.14	13335 (CLOUDFLAR...) (CLOUDFLARENET)
1	151.101.192.134 151.101.192.134	54113 (FASTLY) (FASTLY)
2	199.232.192.64 199.232.192.64	54113 (FASTLY) (FASTLY)
2	2600:9000:205... 2600:9000:2057:6e00:6:8656:f5c0:93a1	16509 (AMAZON-02) (AMAZON-02)
35	8

21 188.114.97.3 (Amsterdam, Netherlands)

ASN13335 (CLOUDFLARENET, US)

martin.kleppmann.com	Domain lookup VirusTotal SecurityTrails crt.sh Censys Domaintools

1 2606:4700:20::681a:ddc (United States)

ASN13335 (CLOUDFLARENET, US)

cdn.mathjax.org	Domain lookup VirusTotal SecurityTrails crt.sh Censys Domaintools

1 172.64.150.56 (San Francisco, United States)

ASN13335 (CLOUDFLARENET, US)

martinkl.substack.com	Domain lookup VirusTotal SecurityTrails crt.sh Censys Domaintools

5 199.232.192.134 (United States)

ASN54113 (FASTLY, US)

martinkl.disqus.com	Domain lookup VirusTotal SecurityTrails crt.sh Censys Domaintools
referrer.disqus.com	Domain lookup VirusTotal SecurityTrails crt.sh Censys Domaintools

2 104.17.24.14 (None, )

ASN13335 (CLOUDFLARENET, US)

cdnjs.cloudflare.com	Domain lookup VirusTotal SecurityTrails crt.sh Censys Domaintools

1 151.101.192.134 (San Francisco, United States)

ASN54113 (FASTLY, US)

disqus.com	Domain lookup VirusTotal SecurityTrails crt.sh Censys Domaintools

2 199.232.192.64 (United States)

ASN54113 (FASTLY, US)

tempest.services.disqus.com	Domain lookup VirusTotal SecurityTrails crt.sh Censys Domaintools

2 2600:9000:2057:6e00:6:8656:f5c0:93a1 (United States)

ASN16509 (AMAZON-02, US)

c.disquscdn.com	Domain lookup VirusTotal SecurityTrails crt.sh Censys Domaintools

	Apex Domain Subdomains	Transfer
21	kleppmann.com martin.kleppmann.com	304 KB
8	disqus.com martinkl.disqus.com disqus.com — Cisco Umbrella Rank: 1153 tempest.services.disqus.com — Cisco Umbrella Rank: 17654 referrer.disqus.com — Cisco Umbrella Rank: 9022	28 KB
2	disquscdn.com c.disquscdn.com — Cisco Umbrella Rank: 6654	839 B
2	cloudflare.com cdnjs.cloudflare.com — Cisco Umbrella Rank: 220	70 KB
1	substack.com martinkl.substack.com
1	mathjax.org cdn.mathjax.org — Cisco Umbrella Rank: 33828	1 KB
35	6

	Domain	Requested by
21	martin.kleppmann.com	martin.kleppmann.com
4	referrer.disqus.com	martin.kleppmann.com
2	c.disquscdn.com	martinkl.disqus.com
2	tempest.services.disqus.com	martinkl.disqus.com
2	cdnjs.cloudflare.com	cdn.mathjax.org cdnjs.cloudflare.com
1	disqus.com	martinkl.disqus.com
1	martinkl.disqus.com	martin.kleppmann.com
1	martinkl.substack.com	martin.kleppmann.com
1	cdn.mathjax.org	martin.kleppmann.com
35	9

This site contains links to these domains. Also see Links.

Domain
dataintensive.net
redis.io
pdfs.semanticscholar.org
aphyr.com
research.google.com
www.slideshare.net
blog.cloudera.com
mechanical-sympathy.blogspot.co.uk
twitter.com
queue.acm.org
github.com
courses.csail.mit.edu
www.cs.princeton.edu
cs.brown.edu
linux.die.net
www.eecis.udel.edu
www.net.t-labs.tu-berlin.de
xenia.media.mit.edu
zookeeper.apache.org
curator.apache.org
www.postgresql.org
antirez.com
shop.oreilly.com
www.distributedprogramming.net
news.ycombinator.com
dx.doi.org
www.patreon.com
bsky.app
nondeterministic.computer
feeds.feedburner.com
martinkl.substack.com
www.goodreads.com
www.inkandswitch.com
www.cst.cam.ac.uk
creativecommons.org
carringtontheme.com

Subject Issuer	Validity	Valid
kleppmann.com WE1	`2024-09-24` - `2024-12-23`	3 months	crt.sh
mathjax.org WE1	`2024-10-20` - `2025-01-18`	3 months	crt.sh
substack.com WE1	`2024-10-11` - `2025-01-09`	3 months	crt.sh
*.disqus.com Sectigo RSA Domain Validation Secure Server CA	`2024-04-16` - `2025-04-16`	a year	crt.sh
cdnjs.cloudflare.com WE1	`2024-09-28` - `2024-12-27`	3 months	crt.sh
*.services.disqus.com GlobalSign Atlas R3 DV TLS CA 2024 Q2	`2024-06-10` - `2025-07-12`	a year	crt.sh
a.disquscdn.com Amazon RSA 2048 M02	`2024-07-30` - `2025-08-27`	a year	crt.sh

This page contains 7 frames:

Primary Page: https://martin.kleppmann.com/2016/02/08/how-to-do-distributed-locking.html
Frame ID: DBA0FA2BA45A25DB13E1C425B49E6094
Requests: 29 HTTP requests in this frame

Frame: https://martinkl.substack.com/embed
Frame ID: 7761C252024C4EAF7A3456611AC8271D
Requests: 1 HTTP requests in this frame

Frame: https://disqus.com/embed/comments/?base=default&f=martinkl&t_i=http%3A%2F%2Fmartin.kleppmann.com%2F2016%2F02%2F08%2Fhow-to-do-distributed-locking.html&t_u=http%3A%2F%2Fmartin.kleppmann.com%2F2016%2F02%2F08%2Fhow-to-do-distributed-locking.html&t_d=How%20to%20do%20distributed%20locking%20%E2%80%94%20Martin%20Kleppmann%E2%80%99s%20blog&t_t=How%20to%20do%20distributed%20locking%20%E2%80%94%20Martin%20Kleppmann%E2%80%99s%20blog&s_o=default
Frame ID: F2C85A011D08E6CDEB396664DEFC2713
Requests: 1 HTTP requests in this frame

Frame: https://tempest.services.disqus.com/ads-iframe/taboola/?position=top&shortname=martinkl&experiment=network_default&variant=fallthrough&service=dynamic&anchorColor=%23a00004&colorScheme=light&sourceUrl=http%3A%2F%2Fmartin.kleppmann.com%2F2016%2F02%2F08%2Fhow-to-do-distributed-locking.html&typeface=sans-serif&disqus_version=current
Frame ID: 22383DA2B9A16310E69055868E7010F7
Requests: 1 HTTP requests in this frame

Frame: https://tempest.services.disqus.com/ads-iframe/taboola/?position=bottom&shortname=martinkl&experiment=network_default&variant=fallthrough&service=dynamic&anchorColor=%23a00004&colorScheme=light&sourceUrl=http%3A%2F%2Fmartin.kleppmann.com%2F2016%2F02%2F08%2Fhow-to-do-distributed-locking.html&typeface=sans-serif&disqus_version=current
Frame ID: 3D13FD5501148D915872B0492128DDDC
Requests: 1 HTTP requests in this frame

Frame: https://c.disquscdn.com/next/embed/styles/realtime.b23ff3c36dd0169627f8e54ca1621eca.css
Frame ID: 46C91850001E3E402EA6DCCF25099B4F
Requests: 1 HTTP requests in this frame

Frame: https://c.disquscdn.com/next/embed/styles/realtime.b23ff3c36dd0169627f8e54ca1621eca.css
Frame ID: 1BDAB517986BB1CEE60D95057BBE89E6
Requests: 1 HTTP requests in this frame

Screenshot
Live screenshot

Full Image

Page Title

How to do distributed locking — Martin Kleppmann’s blog

Detected technologies

MathJax (JavaScript Graphics) Expand

Overall confidence: 100%
Detected patterns

([\d.]+)?/mathjax\.js

Page Statistics

35
Requests

100 %
HTTPS

25 %
IPv6

6
Domains

9
Subdomains

8
IPs

3
Countries

404 kB
Transfer

702 kB
Size

1
Cookies

55 Outgoing links

These are links going to different origins than the main page.

URL: http://dataintensive.net/
Title: my book

Search URL Search Domain Scan URL

URL: http://redis.io/topics/distlock
Title: Redlock

Search URL Search Domain Scan URL

URL: http://redis.io/
Title: Redis

Search URL Search Domain Scan URL

URL: https://pdfs.semanticscholar.org/a25e/ee836dbd2a5ae680f835309a484c9f39ae4e.pdf
Title: leases

Search URL Search Domain Scan URL

URL: https://aphyr.com/tags/Redis
Title: elsewhere

Search URL Search Domain Scan URL

URL: https://research.google.com/archive/chubby.html
Title: for efficiency or for correctness

Search URL Search Domain Scan URL

URL: http://www.slideshare.net/enissoz/hbase-and-hdfs-understanding-filesystem-usage
Title: have this problem

Search URL Search Domain Scan URL

URL: https://blog.cloudera.com/blog/2011/02/avoiding-full-gcs-in-hbase-with-memstore-local-allocation-buffers-part-1/
Title: several minutes

Search URL Search Domain Scan URL

URL: http://mechanical-sympathy.blogspot.co.uk/2013/07/java-garbage-collection-distilled.html
Title: need to stop the world

Search URL Search Domain Scan URL

URL: https://twitter.com/aphyr/status/682077908953792512
Title: black node in your scheduler tree

Search URL Search Domain Scan URL

URL: https://queue.acm.org/detail.cfm?id=2655736
Title: they do

Search URL Search Domain Scan URL

URL: https://github.com/blog/1364-downtime-last-saturday
Title: incident at GitHub

Search URL Search Domain Scan URL

URL: https://twitter.com/lindsey/status/575006945213485056
Title: incrementing a counter

Search URL Search Domain Scan URL

URL: http://courses.csail.mit.edu/6.852/08/papers/CT96-JACM.pdf
Title: asynchronous model with unreliable failure detectors

Search URL Search Domain Scan URL

URL: http://www.cs.princeton.edu/courses/archive/fall07/cos518/papers/flp.pdf
Title: consensus becomes impossible

Search URL Search Domain Scan URL

URL: https://cs.brown.edu/~mph/Herlihy91/p124-herlihy.pdf
Title: requires consensus

Search URL Search Domain Scan URL

URL: https://github.com/antirez/redis/blob/edd4d555df57dc84265fdfb4ef59a4678832f6da/src/server.c#L390-L404
Title: uses gettimeofday

Search URL Search Domain Scan URL

URL: http://linux.die.net/man/2/clock_gettime
Title: monotonic clock

Search URL Search Domain Scan URL

URL: https://github.com/antirez/redis/blob/f0b168e8944af41c4161249040f01ece227cfc0c/src/db.c#L933-L959
Title: expiry of keys

Search URL Search Domain Scan URL

URL: http://linux.die.net/man/2/gettimeofday
Title: explicitly says

Search URL Search Domain Scan URL

URL: https://www.eecis.udel.edu/~mills/ntp/html/clock.html
Title: stepped by NTP

Search URL Search Domain Scan URL

URL: http://www.net.t-labs.tu-berlin.de/~petr/ADC-07/papers/DLS88.pdf
Title: without making any timing assumptions

Search URL Search Domain Scan URL

URL: http://redis.io/topics/distlock#performance-crash-recovery-and-fsync
Title: recommends delaying restarts

Search URL Search Domain Scan URL

URL: http://xenia.media.mit.edu/~nelson/research/ntp-survey99/
Title: bad NTP server

Search URL Search Domain Scan URL

URL: https://aphyr.com/tags/jepsen
Title: Jepsen

Search URL Search Domain Scan URL

URL: http://redis.io/commands/set
Title: straightforward single-node locking algorithm

Search URL Search Domain Scan URL

URL: https://zookeeper.apache.org/
Title: ZooKeeper

Search URL Search Domain Scan URL

URL: http://curator.apache.org/curator-recipes/index.html
Title: Curator recipes

Search URL Search Domain Scan URL

URL: http://www.postgresql.org/
Title: database with reasonable transactional guarantees

Search URL Search Domain Scan URL

URL: http://antirez.com/
Title: Salvatore

Search URL Search Domain Scan URL

URL: http://shop.oreilly.com/product/0636920028901.do
Title: Junqueira and Reed’s book

Search URL Search Domain Scan URL

URL: http://www.distributedprogramming.net/
Title: Cachin, Guerraoui and Rodrigues’ textbook

Search URL Search Domain Scan URL

URL: https://aphyr.com/
Title: Kyle Kingsbury

Search URL Search Domain Scan URL

URL: https://twitter.com/skamille
Title: Camille Fournier

Search URL Search Domain Scan URL

URL: https://twitter.com/fpjunqueira
Title: Flavio Junqueira

Search URL Search Domain Scan URL

URL: http://antirez.com/news/101
Title: posted a rebuttal

Search URL Search Domain Scan URL

URL: https://news.ycombinator.com/item?id=11065933
Title: HN discussion

Search URL Search Domain Scan URL

URL: https://dx.doi.org/10.1145/74850.74870
Title: doi:10.1145/74850.74870

Search URL Search Domain Scan URL

URL: https://dx.doi.org/10.1145/2639988.2639988
Title: doi:10.1145/2639988.2639988

Search URL Search Domain Scan URL

URL: https://dx.doi.org/10.1145/226643.226647
Title: doi:10.1145/226643.226647

Search URL Search Domain Scan URL

URL: https://dx.doi.org/10.1145/3149.214121
Title: doi:10.1145/3149.214121

Search URL Search Domain Scan URL

URL: https://dx.doi.org/10.1145/114005.102808
Title: doi:10.1145/114005.102808

Search URL Search Domain Scan URL

URL: https://dx.doi.org/10.1145/42282.42283
Title: doi:10.1145/42282.42283

Search URL Search Domain Scan URL

URL: https://dx.doi.org/10.1007/978-3-642-15260-3
Title: doi:10.1007/978-3-642-15260-3

Search URL Search Domain Scan URL

URL: https://www.patreon.com/martinkl
Title: support me on Patreon

Search URL Search Domain Scan URL

URL: https://bsky.app/profile/martin.kleppmann.com
Title: follow me on Bluesky

Search URL Search Domain Scan URL

URL: https://nondeterministic.computer/@martin
Title: Mastodon

Search URL Search Domain Scan URL

URL: http://feeds.feedburner.com/martinkl
Title: Site RSS feed

Search URL Search Domain Scan URL

URL: https://martinkl.substack.com/
Title: email notification

Search URL Search Domain Scan URL

URL: https://www.goodreads.com/book/show/23466395-designing-data-intensive-applications
Title: thousands

Search URL Search Domain Scan URL

URL: https://www.inkandswitch.com/local-first/
Title: local-first software

Search URL Search Domain Scan URL

URL: http://www.cst.cam.ac.uk/
Title: University of Cambridge

Search URL Search Domain Scan URL

URL: http://creativecommons.org/licenses/by/3.0/

Search URL Search Domain Scan URL

URL: http://carringtontheme.com/
Title: Carrington

Search URL Search Domain Scan URL

URL: https://github.com/mojombo/jekyll
Title: Jekyll

Search URL Search Domain Scan URL

Redirected requests

There were HTTP redirect chains for the following requests:

35 HTTP transactions
0 data transactions

Method
Protocol Status Resource
Path Size
x-fer Time
Latency Type
MIME-Type IP
Location

GET
H3 200 Primary Request how-to-do-distributed-locking.html Show response
martin.kleppmann.com/2016/02/08/ 41 KB
16 KB 105ms
54ms Document
text/html 188.114.97.3
CLOUDFLARENET

General

Check archive.org

Show headers Download Go to

Full URL: https://martin.kleppmann.com/2016/02/08/how-to-do-distributed-locking.html
Protocol: H3
Security: QUIC, , AES_128_GCM
Server: 188.114.97.3 Amsterdam, Netherlands, ASN13335 (CLOUDFLARENET, US),
Reverse DNS
Software: cloudflare /
Resource Hash: 3b7f38b48680e31c4315d9961e874c12c5d457deac6a893120f693ee016cbde2

Request headers

Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Response headers

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server: cloudflare
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x-amz-request-id: HDC4B3YFXR3ZBH4F

GET
H3 200 typography.css
martin.kleppmann.com/css/ 3 KB
2 KB 30ms
28ms Stylesheet
text/css 188.114.97.3
CLOUDFLARENET

General

Check archive.org

Show headers Download Go to

Full URL: https://martin.kleppmann.com/css/typography.css
Requested by: Host: martin.kleppmann.com
URL: https://martin.kleppmann.com/2016/02/08/how-to-do-distributed-locking.html
Protocol: H3
Security: QUIC, , AES_128_GCM
Server: 188.114.97.3 Amsterdam, Netherlands, ASN13335 (CLOUDFLARENET, US),
Reverse DNS
Software: cloudflare /
Resource Hash: 171e61c7ebb645c2f14033bdd57342d6dff5bf5138b4346f538d0bcf1cb25d44

Request headers

User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36
Referer: https://martin.kleppmann.com/2016/02/08/how-to-do-distributed-locking.html

Response headers

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cf-cache-status: HIT
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report-to: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v4?s=Qw7P6itig%2F7J9HK8GQOH%2F6Jh2dcECHo%2FDPGbFgYDLQI2kqP%2FmmbSHH7SXF9OCGrYL8vqzZA%2Bjm%2BSlkTaL0c1x%2BiVx7TkiGFimXelbA1MTk1ZIBMG%2FHRX1UA5qjoRYVmY0pFSz8cEew%3D%3D"}],"group":"cf-nel","max_age":604800}
alt-svc: h3=":443"; ma=86400
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date: Mon, 21 Oct 2024 02:36:20 GMT
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vary: Accept-Encoding
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x-amz-request-id: QMW765X2CEAH2HAQ
cf-ray: 8d5ddc065c935d39-FRA
server: cloudflare

GET
H3 200 style.css
martin.kleppmann.com/css/ 2 KB
2 KB 31ms
28ms Stylesheet
text/css 188.114.97.3
CLOUDFLARENET

General

Check archive.org

Show headers Download Go to

Full URL: https://martin.kleppmann.com/css/style.css
Requested by: Host: martin.kleppmann.com
URL: https://martin.kleppmann.com/2016/02/08/how-to-do-distributed-locking.html
Protocol: H3
Security: QUIC, , AES_128_GCM
Server: 188.114.97.3 Amsterdam, Netherlands, ASN13335 (CLOUDFLARENET, US),
Reverse DNS
Software: cloudflare /
Resource Hash: 2b9d71d09a1c9e0a5c7f48eda784b0e6fd2ead8c3d91b999eb24c5aa9ffe0f11

Request headers

User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36
Referer: https://martin.kleppmann.com/2016/02/08/how-to-do-distributed-locking.html

Response headers

content-encoding: zstd
cf-cache-status: HIT
etag: W/"0103ec659f4d931874959b46ce520434"
age: 10167
report-to: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v4?s=fp%2Bl7DRNB9BZtHusJIgSMsAid6QviK7E3wMkEZIPVSlHs3AJ%2F9OUOi0N7qx29q8i2HPn%2B0YdWQeH4meJ2SocNig4HKS4WCEH06KuEJkG6rF76wyaEvH%2F9JrVcyk9MR%2BTCGhKBOhtgg%3D%3D"}],"group":"cf-nel","max_age":604800}
alt-svc: h3=":443"; ma=86400
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date: Mon, 21 Oct 2024 02:36:20 GMT
content-type: text/css
last-modified: Thu, 15 Sep 2022 11:00:50 GMT
vary: Accept-Encoding
priority: u=0,i=?0
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x-amz-request-id: W7E08S3NVPBKZCWA
cf-ray: 8d5ddc066c945d39-FRA
server: cloudflare

GET
H3 200 pygments-default.css
martin.kleppmann.com/css/ 3 KB
2 KB 291ms
289ms Stylesheet
text/css 188.114.97.3
CLOUDFLARENET

General

Check archive.org

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martinkl.substack.com/ Frame 7761 0
0 220ms
144ms Document
text/html 172.64.150.56
CLOUDFLARENET

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https://martinkl.substack.com/embed

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Host: martin.kleppmann.com
URL: https://martin.kleppmann.com/2016/02/08/how-to-do-distributed-locking.html

Protocol

Security

QUIC, , AES_128_GCM

Server

172.64.150.56 San Francisco, United States, ASN13335 (CLOUDFLARENET, US),

Reverse DNS

Software

cloudflare / Express

Resource Hash

Security Headers

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Request headers

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GET
H/1.1 200
OK embed.js Show response
martinkl.disqus.com/ 80 KB
26 KB 350ms
228ms Script
application/javascript 199.232.192.134
FASTLY

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https://martinkl.disqus.com/embed.js

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Host: martin.kleppmann.com
URL: https://martin.kleppmann.com/2016/02/08/how-to-do-distributed-locking.html

Protocol

HTTP/1.1

Security

TLS 1.3, , AES_128_GCM

Server

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Reverse DNS

Software

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server: openresty

GET
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martin.kleppmann.com/images/ 330 B
1 KB 62ms
57ms Image
image/gif 188.114.97.3
CLOUDFLARENET

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Full URL: https://martin.kleppmann.com/images/header-gradient.gif
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URL: https://martin.kleppmann.com/css/carrington-blog.css
Protocol: H3
Security: QUIC, , AES_128_GCM
Server: 188.114.97.3 Amsterdam, Netherlands, ASN13335 (CLOUDFLARENET, US),
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Request headers

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GET
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martin.kleppmann.com/images/ 47 KB
47 KB 63ms
58ms Image
image/jpeg 188.114.97.3
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Full URL: https://martin.kleppmann.com/images/header-texture.jpg
Requested by: Host: martin.kleppmann.com
URL: https://martin.kleppmann.com/css/carrington-blog.css
Protocol: H3
Security: QUIC, , AES_128_GCM
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Request headers

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Response headers

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GET
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martin.kleppmann.com/images/ 43 B
854 B 60ms
57ms Image
image/gif 188.114.97.3
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Full URL: https://martin.kleppmann.com/images/sub-header-border-bottom.gif
Requested by: Host: martin.kleppmann.com
URL: https://martin.kleppmann.com/css/carrington-blog.css
Protocol: H3
Security: QUIC, , AES_128_GCM
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Request headers

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GET
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831 B 52ms
50ms Image
image/gif 188.114.97.3
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Full URL: https://martin.kleppmann.com/images/arrow-bullet.gif
Requested by: Host: martin.kleppmann.com
URL: https://martin.kleppmann.com/css/typography.css
Protocol: H3
Security: QUIC, , AES_128_GCM
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Reverse DNS
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Request headers

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2 KB 46ms
45ms Image
image/gif 188.114.97.3
CLOUDFLARENET

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Full URL: https://martin.kleppmann.com/images/sidebar-background.gif
Requested by: Host: martin.kleppmann.com
URL: https://martin.kleppmann.com/css/carrington-blog.css
Protocol: H3
Security: QUIC, , AES_128_GCM
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Response headers

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2 KB 50ms
49ms Image
image/gif 188.114.97.3
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Full URL: https://martin.kleppmann.com/images/divider-ornament.gif
Requested by: Host: martin.kleppmann.com
URL: https://martin.kleppmann.com/css/carrington-blog.css
Protocol: H3
Security: QUIC, , AES_128_GCM
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3 KB 51ms
49ms Image
image/gif 188.114.97.3
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Full URL: https://martin.kleppmann.com/images/rss-button.gif
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URL: https://martin.kleppmann.com/css/carrington-blog.css
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1 KB 54ms
53ms Image
image/gif 188.114.97.3
CLOUDFLARENET

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Full URL: https://martin.kleppmann.com/images/footer-gradient.gif
Requested by: Host: martin.kleppmann.com
URL: https://martin.kleppmann.com/css/carrington-blog.css
Protocol: H3
Security: QUIC, , AES_128_GCM
Server: 188.114.97.3 Amsterdam, Netherlands, ASN13335 (CLOUDFLARENET, US),
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Request headers

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https://referrer.disqus.com/juggler/event.gif?imp=8p350fvbc2sn0&experiment=network_default&variant=fallthrough&service=dynamic&area=bottom&product=embed&forum=martinkl&zone=thread&version=b040cc4fb9749f836fa39cae48953897&page_url=https%3A%2F%2Fmartin.kleppmann.com%2F2016%2F02%2F08%2Fhow-to-do-distributed-locking.html&page_referrer=&object_type=advertisement&provider=taboola&event=activity&ad_product_name=iab_display&ad_product_layout=iab_display&bin=embed%3Apromoted_discovery%3Adynamic%3Anetwork_default%3Afallthrough&object_id=%5B184193%5D&section=default&verb=load&advertisement_id=184193&forum_id=407339

Requested by

Host: martin.kleppmann.com
URL: https://martin.kleppmann.com/2016/02/08/how-to-do-distributed-locking.html

Protocol

HTTP/1.1

Security

TLS 1.3, , AES_128_GCM

Server

199.232.192.134 , United States, ASN54113 (FASTLY, US),

Reverse DNS

Software

nginx /

Resource Hash

cf4724b2f736ed1a0ae6bc28f1ead963d9cd2c1fd87b6ef32e7799fc1c5c8bda

Security Headers

Name	Value
X-Content-Type-Options	nosniff
X-Xss-Protection	1; mode=block

Request headers

User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36
Referer: https://martin.kleppmann.com/

Response headers

Connection: keep-alive
Cross-Origin-Resource-Policy: cross-origin
x-content-type-options: nosniff
Content-Length: 43
x-xss-protection: 1; mode=block
Date: Mon, 21 Oct 2024 02:36:23 GMT
content-type: image/gif
last-modified: Mon, 28 Sep 1970 06:00:00 GMT
server: nginx

GET
H/1.1 200
OK event.gif
referrer.disqus.com/juggler/ 43 B
339 B 392ms
382ms Image
image/gif 199.232.192.134
FASTLY

General

Check archive.org

Show headers Download Go to Show image

Full URL

https://referrer.disqus.com/juggler/event.gif?imp=8p350fvbc2sn0&experiment=network_default&variant=fallthrough&service=dynamic&area=top&product=embed&forum=martinkl&zone=thread&version=b040cc4fb9749f836fa39cae48953897&page_url=https%3A%2F%2Fmartin.kleppmann.com%2F2016%2F02%2F08%2Fhow-to-do-distributed-locking.html&page_referrer=&object_type=advertisement&provider=taboola&event=activity&ad_product_name=iab_display&ad_product_layout=iab_display&bin=embed%3Apromoted_discovery%3Adynamic%3Anetwork_default%3Afallthrough&object_id=%5B184193%5D&section=default&verb=load&advertisement_id=184193&forum_id=407339

Requested by

Host: martin.kleppmann.com
URL: https://martin.kleppmann.com/2016/02/08/how-to-do-distributed-locking.html

Protocol

HTTP/1.1

Security

TLS 1.3, , AES_128_GCM

Server

199.232.192.134 , United States, ASN54113 (FASTLY, US),

Reverse DNS

Software

nginx /

Resource Hash

cf4724b2f736ed1a0ae6bc28f1ead963d9cd2c1fd87b6ef32e7799fc1c5c8bda

Security Headers

Name	Value
X-Content-Type-Options	nosniff
X-Xss-Protection	1; mode=block

Request headers

User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36
Referer: https://martin.kleppmann.com/

Response headers

Connection: keep-alive
Cross-Origin-Resource-Policy: cross-origin
x-content-type-options: nosniff
Content-Length: 43
x-xss-protection: 1; mode=block
Date: Mon, 21 Oct 2024 02:36:24 GMT
content-type: image/gif
last-modified: Mon, 28 Sep 1970 06:00:00 GMT
server: nginx

GET
H3 404 favicon.ico
martin.kleppmann.com/ 346 B
1007 B 236ms
235ms Other
text/html 188.114.97.3
CLOUDFLARENET

General

Check archive.org

Show headers Download Go to

Full URL: https://martin.kleppmann.com/favicon.ico
Protocol: H3
Security: QUIC, , AES_128_GCM
Server: 188.114.97.3 Amsterdam, Netherlands, ASN13335 (CLOUDFLARENET, US),
Reverse DNS
Software: cloudflare /
Resource Hash: 8b4e4bf18b9dd5f2918bfb0ddd854b6d03707a10d7adfae1169c6be612feb69b

Request headers

User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36
Referer: https://martin.kleppmann.com/2016/02/08/how-to-do-distributed-locking.html

Response headers

cache-control: max-age=14400
nel: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
content-encoding: zstd
cf-cache-status: EXPIRED
report-to: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v4?s=OELvj5IIBclmUqwjFlc01IvHKVx194JsppVCCxo6HOHdsOBGCGhdLe0kZxc6ejLSki8M9Pj%2FNqF6k0jIdiowZmTRgr3gVmAX%2B53WnvqKJknJxvYdJJwzYG%2Fb3iQdlrKQ%2FB9rbJOiLw%3D%3D"}],"group":"cf-nel","max_age":604800}
x-amz-request-id: V81A38976WR86NKW
cf-ray: 8d5ddc1dea2b5d39-FRA
alt-svc: h3=":443"; ma=86400
server-timing: cfL4;desc="?proto=QUIC&rtt=28071&sent=300&recv=97&lost=0&retrans=1&sent_bytes=322878&recv_bytes=14854&delivery_rate=1548076&cwnd=130200&unsent_bytes=0&cid=85beeca153ae8e10&ts=4128&x=1", cfExtPri, cfHdrFlush;dur=0
date: Mon, 21 Oct 2024 02:36:24 GMT
content-type: text/html; charset=utf-8
vary: Accept-Encoding
server: cloudflare
priority: u=1,i
x-amz-id-2: M2SjXIUds9ArG4VRIp0ZSRfYFRFG3Ec7qCMEIl/AjD22qveMUL7xdNTkBXOM/uh8lUjjYPAEOA4=

Verdicts & Comments Add Verdict or Comment

13 JavaScript Global Variables

These are the non-standard "global" variables defined on the window object. These can be helpful in identifying possible client-side frameworks and code.

1 Cookies

Cookies are little pieces of information stored in the browser of a user. Whenever a user visits the site again, he will also send his cookie values, thus allowing the website to re-identify him even if he changed locations. This is how permanent logins work.

			Domain/Path	Expires	Name / Value
			.substack.com/	1970-01-21 00:24:39	Name: __cf_bm Value: Gk4dBFVYPOaJ1YAonlV61L2ovZqblfeFxWbvHg2G_00-1729478181-1.0.1.1-reZvz2cEOTzIjLvx4NjvBfhxyTUIRnXoHOJiYdwBlgEW.nRr3pO34oawPET1q6pbyZEDxvUh_IhiaKhWiBpSCg

1 Console Messages

A page may trigger messages to the console to be logged. These are often error messages about being unable to load a resource or execute a piece of JavaScript. Sometimes they also provide insight into the technology behind a website.

Source	Level	URL Text
network	error	URL: https://martin.kleppmann.com/favicon.ico Message: Failed to load resource: the server responded with a status of 404 ()

Indicators

This is a term in the security industry to describe indicators such as IPs, Domains, Hashes, etc. This does not imply that any of these indicate malicious activity.

c.disquscdn.com
cdn.mathjax.org
cdnjs.cloudflare.com
disqus.com
martin.kleppmann.com
martinkl.disqus.com
martinkl.substack.com
referrer.disqus.com
tempest.services.disqus.com
104.17.24.14
151.101.192.134
172.64.150.56
188.114.97.3
199.232.192.134
199.232.192.64
2600:9000:2057:6e00:6:8656:f5c0:93a1
2606:4700:20::681a:ddc
171e61c7ebb645c2f14033bdd57342d6dff5bf5138b4346f538d0bcf1cb25d44
18a3b14911b63366b6c239d7a43304912f58e5421aa594bbe096485430412687
231d1acd4be71020140c1e76e2f157bd4bfc576530dda2352f45a6bfa3d8cccd
2b9d71d09a1c9e0a5c7f48eda784b0e6fd2ead8c3d91b999eb24c5aa9ffe0f11
2cf5114c7df9a3b9939bb6df5b86b901ac9bd481b4b7dd3a064fe57c8ac2bea5
33923f3026ae78f3c6b6494578a8c475d6644bb6ece8a5257b545def10cd46bc
3b7f38b48680e31c4315d9961e874c12c5d457deac6a893120f693ee016cbde2
48344fd55558bbeb600062a175d052979f9ece87c7299788f8ecf16a46c87bf6
53549b73af9eca63d428a3478653366666c9a1dbb5c984d806dc35fcc80214b6
5d4042580c44453423ffec2272f1a438ff857e7cb2a72bb01288dc09fa4d003b
6be9e405f21ff0ec5b15910fd219682046c3d8329358234508cadd1726ebccbf
8b4e4bf18b9dd5f2918bfb0ddd854b6d03707a10d7adfae1169c6be612feb69b
91300728c3f9e7643b90d58a7c3a4d2cdaf8141cc1dd2484851e6bfd3315b4aa
9f5181dd7951b73c997801312cc3ac887e5b91d0c15af144c25f3c4256fb969e
b3d6d780fb4497070549652fdefc4d16a7ac000725563c9e2d743fd1e054f77a
b51d249e2d16231efeb0f4a544fef9904a8234f10c73468f9facfe5b3440b91e
b9407ed3ca1eb73f0dd96cd5e8e8ef324611e84931bf9033e156724722b7dab8
bbbdf0bdfb5a004d5a6f61ebd4199655021ebb144e2928f1859f4dc2dad45f2f
c284dcb06ef882b1b45e11e0a16baa223b4117eca94e243c8e725c4ce3f909b3
ce372101bf334f748a70419a332397e434e50f3d1eb8fb1f4a118fd298c50a18
cf4724b2f736ed1a0ae6bc28f1ead963d9cd2c1fd87b6ef32e7799fc1c5c8bda
d1736c1913826a6e8755c7954c213816b4158071bf1a994030cb4e659ad436e9
d55087a7fb6e41ea2a83ab87ea1c3892e8736b662d999292cb161f98e2fc5f8d
db9c439d55a66032d09df5742aed74ed08b49403d8e5ea681be3452b0144fa95
dfc0a0a1ab1256b1b1cb90edebd371c5e3fd2087059ec0b92ee91653cc665400
e051cd7977581d1d5c441dceebaa5e01bf4ca7bcaf615f55b75c70c13a75b62c
ffb55525bcd3811c92e884be6f48e295ce01d8e44e5ea3da096a1e365e40e654

martin.kleppmann.com Open in urlscan Pro 188.114.97.3 Public Scan

Summary

urlscan.io Verdict: No classification

Domain & IP information

Screenshot Live screenshot Full Image

Page Title

Detected technologies

Page Statistics

35 Requests

100 %HTTPS

25 %IPv6

6 Domains

9 Subdomains

8 IPs

3 Countries

404 kBTransfer

702 kBSize

1 Cookies

55 Outgoing links

Redirected requests

35 HTTP transactions Everything HTML Script AJAX CSS Image Expand all 0 data transactions

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martin.kleppmann.com Open in urlscan Pro
188.114.97.3 Public Scan

Screenshot
Live screenshot

Full Image

35
Requests

100 %
HTTPS

25 %
IPv6

6
Domains

9
Subdomains

8
IPs

3
Countries

404 kB
Transfer

702 kB
Size

1
Cookies

35 HTTP transactions
0 data transactions