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21lessons.com Open in urlscan Pro
185.199.110.153  Public Scan

Go To Rescan Add Verdict Report
Submitted URL: http://21lessons.com/
Effective URL: https://21lessons.com/
Submission: On September 05 via api from US — Scanned from DE
 Behaviour Indicators
Similar DOM Content API
Verdicts

Summary

This website contacted 4 IPs in 3 countries across 4 domains to perform 13 HTTP transactions. The main IP is 185.199.110.153, located in United States and belongs to FASTLY, US. The main domain is 21lessons.com.
TLS certificate: Issued by R10 on September 1st 2024. Valid for: 3 months.
This is the only time 21lessons.com was scanned on urlscan.io!

urlscan.io Verdict: No classification

Domain & IP information

IP Address AS Autonomous System
8 185.199.110.153 54113 (FASTLY)
2 104.17.24.14 13335 (CLOUDFLAR...)
2 2a00:1450:400... 15169 (GOOGLE)
13 4
Apex Domain
Subdomains		 Transfer
8 21lessons.com
21lessons.com
201 KB
2 gstatic.com
fonts.gstatic.com
31 KB
2 cloudflare.com
cdnjs.cloudflare.com — Cisco Umbrella Rank: 336
86 KB
0 amazon-adsystem.com Failed
z-na.amazon-adsystem.com Failed
13 4
Domain Requested by
8 21lessons.com 21lessons.com
2 fonts.gstatic.com 21lessons.com
2 cdnjs.cloudflare.com 21lessons.com
cdnjs.cloudflare.com
0 z-na.amazon-adsystem.com Failed 21lessons.com
13 4
Subject Issuer Validity Valid
21lessons.com
R10		 2024-09-01 -
2024-11-30		 3 months crt.sh
cdnjs.cloudflare.com
WE1		 2024-07-31 -
2024-10-29		 3 months crt.sh
*.gstatic.com
WR2		 2024-08-12 -
2024-11-04		 3 months crt.sh

This page contains 1 frames:

Primary Page: https://21lessons.com/
Frame ID: 002544DB5A3120FD6B20DEC33419C658
Requests: 13 HTTP requests in this frame

Screenshot
Live screenshot
Full Image

Page Title

21 Lessons - What I've Learned from Falling Down the Bitcoin Rabbit Hole - 21Lessons.com

Page URL History Show full URLs

  1. http://21lessons.com/ HTTP 307
    https://21lessons.com/ Page URL

Detected technologies

Overall confidence: 100%
Detected patterns
  • <link[^>]* href=[^>]*?(?:F|f)o(?:n|r)t-?(?:A|a)wesome(?:[^>]*?([0-9a-fA-F]{7,40}|[\d]+(?:.[\d]+(?:.[\d]+)?)?)|)
  • (?:F|f)o(?:n|r)t-?(?:A|a)wesome(?:.*?([0-9a-fA-F]{7,40}|[\d]+(?:.[\d]+(?:.[\d]+)?)?)|)

Page Statistics

13
Requests

92 %
HTTPS

33 %
IPv6

4
Domains

4
Subdomains

4
IPs

3
Countries

317 kB
Transfer

482 kB
Size

0
Cookies

Page URL History

This captures the URL locations of the websites, including HTTP redirects and client-side redirects via JavaScript or Meta fields.

  1. http://21lessons.com/ HTTP 307
    https://21lessons.com/ Page URL

Redirected requests

There were HTTP redirect chains for the following requests:

13 HTTP transactions

Resource
Path		 Size
x-fer		 Type
MIME-Type
Primary Request /
21lessons.com/
Redirect Chain
  • http://21lessons.com/
  • https://21lessons.com/
8 KB
3 KB 		Document
General
Check archive.org
Download Go to
Full URL
https://21lessons.com/
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
185.199.110.153 , United States, ASN54113 (FASTLY, US),
Reverse DNS
cdn-185-199-110-153.github.com
Software
GitHub.com /
Resource Hash
76e93f0c2e0ad58d2b3b46eaea2bd27830a5b4699f25fc0b17c2d32c7241c2e2
Security Headers
Name Value
Strict-Transport-Security max-age=31556952

Request headers

Upgrade-Insecure-Requests
1
User-Agent
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Response headers

accept-ranges
bytes
access-control-allow-origin
*
age
0
cache-control
max-age=600
content-encoding
gzip
content-length
2618
content-type
text/html; charset=utf-8
date
Thu, 05 Sep 2024 12:47:27 GMT
etag
W/"664fbc15-2005"
expires
Thu, 05 Sep 2024 12:57:27 GMT
last-modified
Thu, 23 May 2024 21:58:45 GMT
server
GitHub.com
strict-transport-security
max-age=31556952
vary
Accept-Encoding
via
1.1 varnish
x-cache
MISS
x-cache-hits
0
x-fastly-request-id
7d17f476b5bffb7d5640e74a8bd59b8df6f85a44
x-github-request-id
EA74:12BA08:5050FA:517E3E:66D9A85F
x-proxy-cache
MISS
x-served-by
cache-fra-etou8220085-FRA
x-timer
S1725540448.883313,VS0,VE110

Redirect headers

Location
https://21lessons.com/
Non-Authoritative-Reason
HttpsUpgrades
app.min.css
21lessons.com/assets/css/ 		43 KB
8 KB 		Stylesheet
General
Check archive.org
Download Go to
Full URL
https://21lessons.com/assets/css/app.min.css
Requested by
Host: 21lessons.com
URL: https://21lessons.com/
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
185.199.110.153 , United States, ASN54113 (FASTLY, US),
Reverse DNS
cdn-185-199-110-153.github.com
Software
GitHub.com /
Resource Hash
e27f5791eb8cc3d91206e36686698b3cd54d7b055c890f8770005375b0488577
Security Headers
Name Value
Strict-Transport-Security max-age=31556952

Request headers

Referer
https://21lessons.com/
User-Agent
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Response headers

expires
Thu, 05 Sep 2024 12:57:28 GMT
x-fastly-request-id
80d9139576d370860f9cfd1ce00cfcfc932c0915
strict-transport-security
max-age=31556952
content-encoding
gzip
via
1.1 varnish
date
Thu, 05 Sep 2024 12:47:28 GMT
age
0
x-cache
MISS
x-cache-hits
0
content-length
7587
x-served-by
cache-fra-etou8220085-FRA
last-modified
Thu, 23 May 2024 21:58:45 GMT
server
GitHub.com
x-github-request-id
088C:890DB:52B3E4:53E21E:66D9A860
x-timer
S1725540448.014046,VS0,VE102
etag
W/"664fbc15-ada8"
vary
Accept-Encoding
content-type
text/css; charset=utf-8
access-control-allow-origin
*
cache-control
max-age=600
accept-ranges
bytes
x-proxy-cache
MISS
all.min.css
cdnjs.cloudflare.com/ajax/libs/font-awesome/5.13.0/css/ 		57 KB
11 KB 		Stylesheet
General
Check archive.org
Download Go to
Full URL
https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.13.0/css/all.min.css
Requested by
Host: 21lessons.com
URL: https://21lessons.com/
Protocol
H3
Security
QUIC, , AES_128_GCM
Server
104.17.24.14 -, , ASN13335 (CLOUDFLARENET, US),
Reverse DNS
Software
cloudflare /
Resource Hash
876d023d9d10c97941b80c3b03e2a5b94631ff7a4af9cee5604a6a2d39718d84
Security Headers
Name Value
Strict-Transport-Security max-age=15780000
X-Content-Type-Options nosniff

Request headers

Referer
https://21lessons.com/
User-Agent
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Response headers

date
Thu, 05 Sep 2024 12:47:28 GMT
content-encoding
br
x-content-type-options
nosniff
cf-cache-status
HIT
nel
{"success_fraction":0.01,"report_to":"cf-nel","max_age":604800}
strict-transport-security
max-age=15780000
age
652194
cross-origin-resource-policy
cross-origin
alt-svc
h3=":443"; ma=86400
content-length
10301
last-modified
Mon, 04 May 2020 16:10:08 GMT
server
cloudflare
cf-cdnjs-via
cfworker/kv
etag
"5eb03e60-e4d2"
vary
Accept-Encoding
report-to
{"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v4?s=LyifZ3kQKMOQ3AVhxsS2N6%2FS7WW7ZW5HGojA6CxVnH%2BfmZ3RmyqSoQgOQ7%2B5%2FLBX9EP8HKzepQcIcqn%2BNgEjvCryFleOK10VaHRR6nXFSWJtTGS57msOz0KXHhlYpBlM1jF4UnFg"}],"group":"cf-nel","max_age":604800}
content-type
text/css; charset=utf-8
access-control-allow-origin
*
cache-control
public, max-age=30672000
accept-ranges
bytes
timing-allow-origin
*
cf-ray
8be653f829abd385-FRA
expires
Tue, 26 Aug 2025 12:47:28 GMT
avatar.jpg
21lessons.com/assets/images/ 		42 KB
42 KB 		Image
General
Check archive.org
Download Go to Show image
Full URL
https://21lessons.com/assets/images/avatar.jpg
Requested by
Host: 21lessons.com
URL: https://21lessons.com/
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
185.199.110.153 , United States, ASN54113 (FASTLY, US),
Reverse DNS
cdn-185-199-110-153.github.com
Software
GitHub.com /
Resource Hash
d386aa765ad87c2b9ad87f6b09f61ba6819cc514d956b8d281816d390ac7e900
Security Headers
Name Value
Strict-Transport-Security max-age=31556952

Request headers

Referer
https://21lessons.com/
User-Agent
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Response headers

expires
Thu, 05 Sep 2024 12:57:28 GMT
x-fastly-request-id
aafbc9c50494ed6b05f43f25c77d800139f297c2
strict-transport-security
max-age=31556952
date
Thu, 05 Sep 2024 12:47:28 GMT
via
1.1 varnish
x-cache-hits
0
age
0
x-cache
MISS
content-length
43032
x-served-by
cache-fra-etou8220085-FRA
last-modified
Thu, 23 May 2024 21:58:45 GMT
server
GitHub.com
x-github-request-id
5897:145290:4DB716:4EE5E5:66D9A85E
x-timer
S1725540448.015023,VS0,VE101
etag
"664fbc15-a818"
vary
Accept-Encoding
content-type
image/jpeg
access-control-allow-origin
*
cache-control
max-age=600
accept-ranges
bytes
x-proxy-cache
MISS
21-lessons-book-ebook-audiobook.webp
21lessons.com/assets/images/ 		84 KB
84 KB 		Image
General
Check archive.org
Download Go to Show image
Full URL
https://21lessons.com/assets/images/21-lessons-book-ebook-audiobook.webp
Requested by
Host: 21lessons.com
URL: https://21lessons.com/
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
185.199.110.153 , United States, ASN54113 (FASTLY, US),
Reverse DNS
cdn-185-199-110-153.github.com
Software
GitHub.com /
Resource Hash
87dab5b4b2618536ee0eb06257c3906d77c9a85ada495bb6d88a8e8dce2586ba
Security Headers
Name Value
Strict-Transport-Security max-age=31556952

Request headers

Referer
https://21lessons.com/
User-Agent
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Response headers

expires
Thu, 05 Sep 2024 12:57:28 GMT
x-fastly-request-id
080a399515805d558f2c577dc829d7482b7a684a
strict-transport-security
max-age=31556952
date
Thu, 05 Sep 2024 12:47:28 GMT
via
1.1 varnish
x-cache-hits
0
age
0
x-cache
MISS
content-length
86078
x-served-by
cache-fra-etou8220085-FRA
last-modified
Thu, 23 May 2024 21:58:45 GMT
server
GitHub.com
x-github-request-id
99B6:890DB:52B3EB:53E223:66D9A85F
x-timer
S1725540448.026083,VS0,VE103
etag
"664fbc15-1503e"
vary
Accept-Encoding
content-type
image/webp
access-control-allow-origin
*
cache-control
max-age=600
accept-ranges
bytes
x-proxy-cache
MISS
flags.webp
21lessons.com/assets/images/ 		5 KB
5 KB 		Image
General
Check archive.org
Download Go to Show image
Full URL
https://21lessons.com/assets/images/flags.webp
Requested by
Host: 21lessons.com
URL: https://21lessons.com/
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
185.199.110.153 , United States, ASN54113 (FASTLY, US),
Reverse DNS
cdn-185-199-110-153.github.com
Software
GitHub.com /
Resource Hash
ed1ee546f9df6060ecc580c4dc1dccf5933d6a47c5ea5010eff77327e600288a
Security Headers
Name Value
Strict-Transport-Security max-age=31556952

Request headers

Referer
https://21lessons.com/
User-Agent
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Response headers

expires
Thu, 05 Sep 2024 12:57:28 GMT
x-fastly-request-id
9c4b3084f325d3f0408cb6d36d9d401f7fda7670
strict-transport-security
max-age=31556952
date
Thu, 05 Sep 2024 12:47:28 GMT
via
1.1 varnish
x-cache-hits
0
age
0
x-cache
MISS
content-length
5242
x-served-by
cache-fra-etou8220085-FRA
last-modified
Thu, 23 May 2024 21:58:45 GMT
server
GitHub.com
x-github-request-id
8560:12BA08:505137:517E64:66D9A85F
x-timer
S1725540448.046705,VS0,VE106
etag
"664fbc15-147a"
vary
Accept-Encoding
content-type
image/webp
access-control-allow-origin
*
cache-control
max-age=600
accept-ranges
bytes
x-origin-cache
HIT
x-proxy-cache
MISS
rabbit.png
21lessons.com/assets/images/ 		6 KB
6 KB 		Image
General
Check archive.org
Download Go to Show image
Full URL
https://21lessons.com/assets/images/rabbit.png
Requested by
Host: 21lessons.com
URL: https://21lessons.com/
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
185.199.110.153 , United States, ASN54113 (FASTLY, US),
Reverse DNS
cdn-185-199-110-153.github.com
Software
GitHub.com /
Resource Hash
69ab0cab559370983fe90b8e96bb776bba14cd117d68089a84b2f2a96379c8c0
Security Headers
Name Value
Strict-Transport-Security max-age=31556952

Request headers

Referer
https://21lessons.com/
User-Agent
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Response headers

expires
Thu, 05 Sep 2024 12:57:28 GMT
x-fastly-request-id
99756dd4ec4cb7c2d834245b298ba08c4ee595b3
strict-transport-security
max-age=31556952
date
Thu, 05 Sep 2024 12:47:28 GMT
via
1.1 varnish
x-cache-hits
0
age
0
x-cache
MISS
content-length
5831
x-served-by
cache-fra-etou8220085-FRA
last-modified
Thu, 23 May 2024 21:58:45 GMT
server
GitHub.com
x-github-request-id
3F04:3BE082:5259E0:5387C2:66D9A860
x-timer
S1725540448.046519,VS0,VE109
etag
"664fbc15-16c7"
vary
Accept-Encoding
content-type
image/png
access-control-allow-origin
*
cache-control
max-age=600
accept-ranges
bytes
x-origin-cache
HIT
x-proxy-cache
MISS
app.min.js
21lessons.com/assets/js/ 		119 KB
40 KB 		Script
General
Check archive.org
Download Go to
Full URL
https://21lessons.com/assets/js/app.min.js
Requested by
Host: 21lessons.com
URL: https://21lessons.com/
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
185.199.110.153 , United States, ASN54113 (FASTLY, US),
Reverse DNS
cdn-185-199-110-153.github.com
Software
GitHub.com /
Resource Hash
769813e91870ac47dbcc6943c5dd127167cb16aed527908cc1515655c1eef3c8
Security Headers
Name Value
Strict-Transport-Security max-age=31556952

Request headers

Referer
https://21lessons.com/
User-Agent
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Response headers

expires
Thu, 05 Sep 2024 12:57:28 GMT
x-fastly-request-id
8b4b1cd95e0a6f6413a5b517081166fd63ab1175
strict-transport-security
max-age=31556952
content-encoding
gzip
via
1.1 varnish
date
Thu, 05 Sep 2024 12:47:28 GMT
age
0
x-cache
MISS
x-cache-hits
0
content-length
40735
x-served-by
cache-fra-etou8220085-FRA
last-modified
Thu, 23 May 2024 21:58:45 GMT
server
GitHub.com
x-github-request-id
4DE2:554FE:5148CA:52763D:66D9A85B
x-timer
S1725540448.046700,VS0,VE96
etag
W/"664fbc15-1dc08"
vary
Accept-Encoding
content-type
application/javascript; charset=utf-8
access-control-allow-origin
*
cache-control
max-age=600
accept-ranges
bytes
x-proxy-cache
MISS
onejs
z-na.amazon-adsystem.com/widgets/ 		0
0
mlTYdpdDwCepOR2s5kS2CwLUuEpTyoUstqEm5AMlJo4.woff2
fonts.gstatic.com/s/lora/v12/ 		15 KB
15 KB 		Font
General
Check archive.org
Download Go to
Full URL
https://fonts.gstatic.com/s/lora/v12/mlTYdpdDwCepOR2s5kS2CwLUuEpTyoUstqEm5AMlJo4.woff2
Requested by
Host: 21lessons.com
URL: https://21lessons.com/assets/css/app.min.css
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
2a00:1450:4001:830::2003 Frankfurt am Main, Germany, ASN15169 (GOOGLE, US),
Reverse DNS
Software
sffe /
Resource Hash
5c44be7bf1b0b598851d837b7c40b3f0675fe7ec8db084c11a9789ecab57bd30
Security Headers
Name Value
X-Content-Type-Options nosniff
X-Xss-Protection 0

Request headers

Referer
https://21lessons.com/
Origin
https://21lessons.com
User-Agent
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Response headers

date
Thu, 29 Aug 2024 17:29:15 GMT
x-content-type-options
nosniff
age
587893
content-security-policy-report-only
require-trusted-types-for 'script'; report-uri https://csp.withgoogle.com/csp/apps-themes
cross-origin-resource-policy
cross-origin
alt-svc
h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
content-length
15316
x-xss-protection
0
last-modified
Tue, 07 Nov 2017 15:25:14 GMT
server
sffe
cross-origin-opener-policy
same-origin; report-to="apps-themes"
report-to
{"group":"apps-themes","max_age":2592000,"endpoints":[{"url":"https://csp.withgoogle.com/csp/report-to/apps-themes"}]}
content-type
font/woff2
access-control-allow-origin
*
cache-control
public, max-age=31536000
accept-ranges
bytes
timing-allow-origin
*
expires
Fri, 29 Aug 2025 17:29:15 GMT
rAXKWvABQNHjPUk26ixVvvesZW2xOQ-xsNqO47m55DA.woff2
fonts.gstatic.com/s/lora/v12/ 		15 KB
15 KB 		Font
General
Check archive.org
Download Go to
Full URL
https://fonts.gstatic.com/s/lora/v12/rAXKWvABQNHjPUk26ixVvvesZW2xOQ-xsNqO47m55DA.woff2
Requested by
Host: 21lessons.com
URL: https://21lessons.com/assets/css/app.min.css
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
2a00:1450:4001:830::2003 Frankfurt am Main, Germany, ASN15169 (GOOGLE, US),
Reverse DNS
Software
sffe /
Resource Hash
3f275b5815ecd7259e3edc7f777fd0f51bd64f644ac361cc0cc74adc7f5807e1
Security Headers
Name Value
X-Content-Type-Options nosniff
X-Xss-Protection 0

Request headers

Referer
https://21lessons.com/
Origin
https://21lessons.com
User-Agent
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Response headers

date
Thu, 29 Aug 2024 18:37:30 GMT
x-content-type-options
nosniff
age
583798
content-security-policy-report-only
require-trusted-types-for 'script'; report-uri https://csp.withgoogle.com/csp/apps-themes
cross-origin-resource-policy
cross-origin
alt-svc
h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
content-length
15292
x-xss-protection
0
last-modified
Tue, 07 Nov 2017 15:24:37 GMT
server
sffe
cross-origin-opener-policy
same-origin; report-to="apps-themes"
report-to
{"group":"apps-themes","max_age":2592000,"endpoints":[{"url":"https://csp.withgoogle.com/csp/report-to/apps-themes"}]}
content-type
font/woff2
access-control-allow-origin
*
cache-control
public, max-age=31536000
accept-ranges
bytes
timing-allow-origin
*
expires
Fri, 29 Aug 2025 18:37:30 GMT
fa-brands-400.woff2
cdnjs.cloudflare.com/ajax/libs/font-awesome/5.13.0/webfonts/ 		75 KB
75 KB 		Font
General
Check archive.org
Download Go to
Full URL
https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.13.0/webfonts/fa-brands-400.woff2
Requested by
Host: cdnjs.cloudflare.com
URL: https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.13.0/css/all.min.css
Protocol
H3
Security
QUIC, , AES_128_GCM
Server
104.17.24.14 -, , ASN13335 (CLOUDFLARENET, US),
Reverse DNS
Software
cloudflare /
Resource Hash
5d9190292acdd48ba0fc35080f7e7448f3cdf0d79199a4d23f0f49b5341fdf29
Security Headers
Name Value
Strict-Transport-Security max-age=15780000
X-Content-Type-Options nosniff

Request headers

Referer
https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.13.0/css/all.min.css
Origin
https://21lessons.com
User-Agent
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Response headers

date
Thu, 05 Sep 2024 12:47:28 GMT
strict-transport-security
max-age=15780000
x-content-type-options
nosniff
cf-cache-status
HIT
nel
{"success_fraction":0.01,"report_to":"cf-nel","max_age":604800}
age
1177054
cross-origin-resource-policy
cross-origin
alt-svc
h3=":443"; ma=86400
content-length
76612
last-modified
Mon, 04 May 2020 16:10:08 GMT
server
cloudflare
cf-cdnjs-via
cfworker/kv
etag
"5eb03e60-12b44"
vary
Accept-Encoding
report-to
{"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v4?s=Mb33U5eikgeK5zEOhzWModZYpjtoKC5hgUijj0ly%2BSx%2BVlS6kFz0y7Xm3glMeuhqyWjkZkULKwWzamlrqJ6SpvZj%2BJ%2FMxrLypew12xRkh%2BbUtij1hNmQWq3NmeUwTTZ0mP6PaJEy"}],"group":"cf-nel","max_age":604800}
content-type
application/octet-stream; charset=utf-8
access-control-allow-origin
*
cache-control
public, max-age=30672000
accept-ranges
bytes
timing-allow-origin
*
cf-ray
8be653f90b906964-FRA
expires
Tue, 26 Aug 2025 12:47:28 GMT
favicon-32x32.png
21lessons.com/ 		12 KB
12 KB 		Other
General
Check archive.org
Download Go to
Full URL
https://21lessons.com/favicon-32x32.png
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
185.199.110.153 , United States, ASN54113 (FASTLY, US),
Reverse DNS
cdn-185-199-110-153.github.com
Software
GitHub.com /
Resource Hash
ba98ebb1242f0d66cfd9d33c297ea660a67f349b2eaefc8feb03875cf1f9f06a
Security Headers
Name Value
Strict-Transport-Security max-age=31556952

Request headers

Referer
https://21lessons.com/
User-Agent
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Response headers

expires
Thu, 05 Sep 2024 12:57:28 GMT
x-fastly-request-id
0e3926a81d111f03cccebe306a850e6963b67647
strict-transport-security
max-age=31556952
date
Thu, 05 Sep 2024 12:47:28 GMT
via
1.1 varnish
x-cache-hits
0
age
0
x-cache
MISS
content-length
12558
x-served-by
cache-fra-etou8220085-FRA
last-modified
Thu, 23 May 2024 21:58:45 GMT
server
GitHub.com
x-github-request-id
DD7D:2F9524:52152B:53444C:66D9A85F
x-timer
S1725540448.220183,VS0,VE101
etag
"664fbc15-310e"
vary
Accept-Encoding
content-type
image/png
access-control-allow-origin
*
cache-control
max-age=600
accept-ranges
bytes
x-origin-cache
HIT
x-proxy-cache
MISS

Failed requests

These URLs were requested, but there was no response received. You will also see them in the list above.

Domain
z-na.amazon-adsystem.com
URL
https://z-na.amazon-adsystem.com/widgets/onejs?MarketPlace=US&adInstanceId=24d60e4a-ce4c-42a0-9d88-40f766b2d4f4

Verdicts & Comments Add Verdict or Comment

2 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.

function| jQuery function| $

0 Cookies

1 Console Messages

Source Level URL
Text
network error URL: https://z-na.amazon-adsystem.com/widgets/onejs?MarketPlace=US&adInstanceId=24d60e4a-ce4c-42a0-9d88-40f766b2d4f4
Message:
Failed to load resource: net::ERR_NAME_NOT_RESOLVED

Security Headers

This page lists any security headers set by the main page. If you want to understand what these mean and how to use them, head on over to this page

Header Value
Strict-Transport-Security max-age=31556952