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Form analysis
2 forms found in the DOM

<form class="" id="f">
  <h1 class="h5 text-uppercase text-primary">DNS Check</h1>
  <div class="input-group input-group-sm">
    <input type="text" id="q" class="form-control form-control-input" placeholder="example.com">
    <select class="custom-select" id="t">
      <option selected="selected" title="Host address (dotted quad)" value="A">A</option>
      <option title="IP v6 address (address spec with colons)" value="AAAA">AAAA</option>
      <option title="Canonical name for an alias (domain name)" value="CNAME">CNAME</option>
      <option title="Mail exchanger (preference value, domain name)" value="MX">MX</option>
      <option title="Authoritative nameserver (domain name)" value="NS">NS</option>
      <option title="Domain name pointer (domain name)" value="PTR">PTR</option>
      <option value="SRV" title="Service record">SRV</option>
      <option title="Start of Authority" value="SOA">SOA</option>
      <option title="Descriptive text (one or more strings)" value="TXT">TXT</option>
      <option value="CAA" title="Certification Authority Authorization">CAA</option>
      <option value="DS" title="Delegation Signer">DS</option>
      <option value="DNSKEY" title="ZSK / KSK Public Keys">DNSKEY</option>
    </select>
    <div class="input-group-append">
      <button class="btn btn-primary" id="s" type="submit"><i class="icon icon-search icon-lg-2"></i> Search</button>
      <button class="btn btn-dark" type="button" id="o" data-toggle="collapse" data-target="#collapseSetting" aria-expanded="false" aria-controls="collapseSetting"><i class="icon icon-settings"></i></button>
      <button class="btn btn-dark" type="button" data-toggle="modal" data-target="#AddDNSModal"><span data-toggle="tooltip" data-placement="top" title="" data-original-title="Add a custom DNS server"><i class="icon icon-plus"></i></span></button>
    </div>
  </div>
  <div class="collapse text-left" id="collapseSetting">
    <ul class="list-group my-1">
      <li class="list-group-item bg-dark text-light rounded-0">
        <div class="form-group form-group-sm">
          <label for="c">Expected Value:</label>
          <div class="form-check float-right ml-2">
            <input class="form-check-input comp_opt" type="radio" name="camp_opt" id="exact_match" value="exact_match" checked="">
            <label class="form-check-label" for="exact_match"> Exact Match </label>
          </div>
          <div class="form-check float-right ml-2">
            <input class="form-check-input comp_opt" type="radio" name="camp_opt" id="contains" value="contains">
            <label class="form-check-label" for="contains"> Contains </label>
          </div>
          <div class="form-check float-right">
            <input class="form-check-input comp_opt" type="radio" name="camp_opt" id="reg_match" value="reg_match">
            <label class="form-check-label" for="reg_match"> RegExp </label>
          </div>
          <input type="text" class="form-control form-control-sm" id="c" placeholder="1.2.3.4">
        </div>
        <div class="row d-none" id="resolved_unresolved_results">
          <div class="col-lg-6"><span class="btn btn-sm btn-success btn-block ev-btn" id="ev_resolved">Resolved DNS: <span>--</span></span></div>
          <div class="col-lg-6"><span class="btn btn-sm btn-danger btn-block ev-btn" id="ev_unresolved">Unresolved DNS: <span>--</span></span></div>
        </div>
      </li>
    </ul>
  </div>
</form>

<form id="add_dns_form" action="" onsubmit="return false;">
  <div class="modal-header rounded-0 bg-primary">
    <h5 class="modal-title text-light" id="AddDNSModalTitle">Add Your Custom DNS</h5>
    <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">×</span></button>
  </div>
  <div class="modal-body">
    <div class="row">
      <div class="col-lg-12" id="AddDNSModalAlert"></div>
      <div class="col-lg-12">
        <div class="form-group">
          <label for="add_dns_name">DNS Name <span class="text-danger">*</span></label>
          <input name="add_dns_name" id="add_dns_name" value="" class="form-control form-control-sm" type="text" placeholder="Mountain View CA, United States">
        </div>
      </div>
      <div class="col-lg-12">
        <div class="row">
          <div class="col-lg-6">
            <div class="form-group">
              <label for="add_dns_ip">DNS IP <span class="text-danger">*</span></label>
              <input name="add_dns_ip" id="add_dns_ip" value="" class="form-control form-control-sm" type="text" placeholder="8.8.8.8">
            </div>
          </div>
          <div class="col-lg-6">
            <div class="form-group">
              <label for="add_dns_ip">DNS Provider</label>
              <input name="add_dns_provider" id="add_dns_provider" value="" class="form-control form-control-sm" type="text" placeholder="Sprint">
            </div>
          </div>
        </div>
      </div>
      <div class="col-lg-12">
        <div class="row">
          <div class="col-lg-6">
            <div class="form-group">
              <label for="add_dns_latitude">DNS Map Latitude</label>
              <input name="add_dns_latitude" id="add_dns_latitude" value="" class="form-control form-control-sm" type="text" placeholder="37">
            </div>
          </div>
          <div class="col-lg-6">
            <div class="form-group">
              <label for="add_dns_longitude">DNS Map Longitude</label>
              <input name="add_dns_longitude" id="add_dns_longitude" value="" class="form-control form-control-sm" type="text" placeholder="-122">
            </div>
          </div>
        </div>
      </div>
      <div class="col-lg-12"><small><span class="text-danger">*</span> <em>Should not be empty</em></small></div>
      <div class="col-lg-12 pt-2">
        <div class="form-check">
          <input class="form-check-input" type="checkbox" value="" id="add_dns_public" checked="">
          <label class="form-check-label font-weight-normal" for="add_dns_public"> Add this DNS server to public DNS List </label>
        </div>
      </div>
    </div>
  </div>
  <div class="modal-footer rounded-0">
    <button type="button" class="btn btn-sm btn-secondary" data-dismiss="modal">Close</button>
    <button type="submit" class="btn btn-sm btn-success" id="add_custom_dns_form_button" style="min-width:150px;">Yes, Add this DNS</button>
  </div>
</form>

Text Content

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 * DNS CHECK
   
   A AAAA CNAME MX NS PTR SRV SOA TXT CAA DS DNSKEY
   Search
    * Expected Value:
      Exact Match
      Contains
      RegExp
      Resolved DNS: --
      Unresolved DNS: --
   
   CD Flag
    
   Refresh: sec.

Holtsville NY, United States
OpenDNS 208.67.222.220 - Mountain View CA, United States
Google 8.8.8.8 - Berkeley, US
Quad9 9.9.9.9 - Miami, United States
AT&T Services 12.121.117.201 - Canoga Park, CA, United States
Sprint 204.117.214.10 - Virginia, United States
VeriSign Global Registry Services 64.6.64.6 - San Jose, United States
Corporate West Computer Systems 66.206.166.2 - Burnaby, Canada
Fortinet Inc 208.91.112.53 - Tuymazy, Russia
MTU Kristall JSC 94.232.184.146 - Cullinan, South Africa
Liquid Telecommunications Ltd 5.11.11.5 - Amsterdam, Netherlands
OpenTLD BV 80.80.80.80 - Paris, France
Online S.A.S. 163.172.107.158 - Madrid, Spain
Prioritytelecom Spain S.A. 212.230.255.1 - Zizers, Switzerland
Oskar Emmenegger 194.209.157.109 - Innsbruck, Austria
nemox.net 83.137.41.9 - Exeter, United Kingdom
South West Communications Group Ltd 81.17.66.13 - Glostrup, Denmark
Nianet A/S 93.176.83.154 - Oberhausen, Germany
Deutsche Telekom AG 195.243.214.4 - Culiacan, Mexico
Megacable 200.52.177.186 - Santa Cruz do Sul, Brazil
Claro S.A 200.248.178.54 - Kuala Lumpur, Malaysia
Ohana Communications Sdn Bhd 103.26.250.4 - Research, Australia
Cloudflare Inc 1.1.1.1 - Melbourne, Australia
Pacific Internet 61.8.0.113 - Auckland, New Zealand
ICONZ Ltd 210.48.77.68 - Singapore
Tefincom S.A. 103.86.99.100 - Seoul, South Korea
LG Dacom Corporation 164.124.101.2 - Hangzhou, China
Aliyun Computing Co. Ltd 223.5.5.5 - Izmir, Turkey
Turk Telekom 212.175.192.114 - Mumbai, India
Aegis Customer Support Services Private Limited 114.31.251.190 - Islamabad,
Pakistan
CMPak Limited 209.150.154.1 - Viana do Castelo, Portugal
CLOUDITY Network 185.83.212.30 - Ireland
Daniel Cid 185.228.168.9 - Dhaka, Bangladesh
Kloud Technologies Limited 103.146.221.20 -

Add A Custom DNS Server Note: Complete DNS Resolution may take up to 48 hours.


CHECK DNS PROPAGATION

Recently changed your DNS records, switched web host, or started a new website:
then you are at the right place! DNS Checker provides a free DNS lookup service
to check Domain Name System records against a selected list of DNS servers
located in multiple regions worldwide. Perform a quick DNS propagation lookup
for any hostname, and check DNS data collected from all available DNS Servers to
confirm that the DNS records are fully propagated.

Ads keep servers running. Donate instead?


 * Created with Highmaps 6.0.7Chart context menuDNS Propagation Map by
   DNSChecker.orgServer LocationResolvedNot Resolved

DNS LISTS

IPS

Public IPv4
Public IPv6

CONTINENTS

Africa
Antarctica
Asia
Europe
North America
Australia
South America

COUNTRIES

United States
Canada
Germany
Russian Federation
Denmark
United Kingdom
Netherlands
Pakistan
Switzerland
Turkey
Spain
South Africa
Japan
Malaysia
India
France
Mexico
China
Brazil
Australia
Singapore
Austria
Ireland
South Korea
New Zealand
Saudia Arabia
Bangladesh
Portugal



WHAT IS DNS PROPAGATION?

DNS propagation is the time DNS changes take to be updated across the internet
on the globe. It can take up to 72 hours to propagate worldwide. You can check
your DNS propagation results from here.


WHAT IS DNS RESOLUTION?

DNS resolution translates the domain name into the site's IP address. You need a
site's IP address to know where it's on the internet. A website could have IPv4
or IPv6 addresses or both. Where the IPv4 address comes in the form of an A
record and the IPv6 address comes in an AAAA record.


HOW DO DNS RECORDS PROPAGATE?

When you update your DNS records, it may take up to 72 hours for the changes to
take effect. During this period, the ISPs worldwide update their DNS cache with
new DNS information for your domain.

However, due to different DNS cache level, after DNS records changes, some of
the visitors might be redirected to the old DNS server, for some time, and other
can see the website from new DNS server, shortly after the changes. You can
perform the A, AAAA, CNAME, and additional DNS records lookup.


WHY DNS PROPAGATION TAKES TIME?

Suppose you changed your domain's nameservers, and you requested to open your
domain on the web browser. Your request will not go to the hosting directly.

Each of the ISP nodes first checks its DNS cache, whether it has the DNS
information for that domain. If it is not there, it will look it up to save it
for future use to speed up the DNA lookup process.

Thus, the new nameservers will not propagate instantly - ISPs have different
cache refreshing levels, so some will still have the old DNS information in
their cache.

But if after that time interval, still, your new DNS changes are not reflecting,
then you go for a DNS health check to ensure that your DNS changes are up to the
mark and are following the standards.


HOW DOES THE DNS PROCESS WORK?

Suppose you request to open the URL https://abc.com in your web browser's bar.

 1. The web browser first checks in its local cache whether it has the requested
    domain's IP address. If it's not present, then it will send the request to
    the Name Resolving Server.
 2. The Name Resolving Server checks its cache against that request. If it fails
    to find the requested domain's IP address, it will send that request to the
    Root Server.
 3. The Root Server only contains the server's IP address with TLD (Top Level
    Domain) related information. It will redirect the Name Resolving Server to
    the TLD server containing .com information.
 4. The TLD server provides the server's IP address (authoritative servers for
    requested URL https://abc.com) to the Name Resolving Server.
 5. The Name Resolving Server caches that information for a specific period
    (TTL) and passes that information to the requested's computer.
 6. The client's computer builds the connection with the authoritative server
    (containing the requested URL https://abc.com) for the requested content and
    caches the IP address's information in its browser for further use.


WHY IS DNS NOT PROPAGATING?

The ISPs across the world have a different caching level. The DNS client or the
server may cache the information the DNS records in its DNS cache. That
information is temporarily cached, and DNS servers will go for the updated DNS
information when TTL (Time to Live) expires.


WHAT WILL HAPPEN IF THE DOMAIN NAME DOES NOT EXIST?

The DNS server will return a name error, also known as an NXDomain response (for
non-existent domain), to symbolize that the query's domain name does not exist.


WHAT IS THE PORT USED BY DNS?

DNS uses both TCP and UDP port 53. However, the most frequently used port for
DNS is UDP 53. That is used when the client's computer communicates with the DNS
server for resolving the specific domain name. Be sure, when using the UDP 53
for DNS, the maximum size of the query packet is 512 bytes.

TCP 53 is used primarily for Zone Transfers and when the query packet exceeds
512 bytes. That is true when DNSSEC is used, which adds extra overhead to the
DNS query packet.


WHAT IS DNS FAILURE?

DNS failure means that the DNS server cannot convert the domain name into an IP
address in a TCP/IP network. That failure may occur within the company's private
network or the internet.


WHICH ARE THE BEST DNS SERVERS?

Some of the best public DNS servers are

 1. Google Public DNS:
    * IPv4:
      * Primary: 8.8.8.8
      * Secondary: 8.8.4.4
    * IPv6:
      * Primary: 2001:4860:4860::8888
      * Secondary: 2001:4860:4860::8844
 2. OpenDNS:
    * IPv4:
      * Primary: 208.67.222.222
      * Secondary: 208.67.220.220
 3. Quad9 (Malware Blocking Enabled):
    * IPv4:
      * Primary: 9.9.9.9
      * Secondary: 149.112.112.112
    * IPv6:
      * Primary: 2620:fe::fe
      * Secondary: 2620:fe::9
 4. DNS.Watch:
    * IPv4:
      * Primary: 84.200.69.80
      * Secondary: 84.200.70.40
    * IPv6:
      * Primary: 2001:1608:10:25::1c04:b12f
      * Secondary: 2001:1608:10:25::9249:d69b
 5. Comodo Secure DNS:
    * IPv4:
      * Primary: 8.26.56.26
      * Secondary: 8.20.247.20
 6. Cloudflare:
    * IPv4:
      * Primary: 1.1.1.1
      * Secondary: 1.0.0.1



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ADD YOUR CUSTOM DNS

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* Should not be empty
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