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Document: TXT records return querier's IP address

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I didn't mention <https://wtfismyip.com/> because I felt the _wtf_
portion wasn't what I wanted on my website.
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Brian Cunnie
2021-06-19 20:02:27 -07:00
parent b066b8821c
commit 69972df833
1 changed files with 26 additions and 6 deletions
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@@ -203,6 +203,27 @@ dig @localhost 127-0-0-1.sslip.io +short # returns "127.0.0.1"</pre>
local addresses.
</li>
</ul>
<h3 id="whatismyip">Determining Your External IP Address</h3>
<p>You can use sslip.io's DNS servers (ns-aws.nono.io, ns-azure.nono.io, ns-gce.nono.io) to determine your public
IP address by querying the `TXT` record of the root domain:</p>
<pre>
dig @ns-aws.nono.io txt . +short # sample reply "2607:fb90:464:ae1e:ed60:29c:884c:4b52"
dig @ns-aws.nono.io txt . +short -4 # forces IPv4 lookup; sample reply "172.58.35.231"
dig @ns-aws.nono.io txt . +short -6 # forces IPv6 lookup; sample reply "2607:fb90:464:ae1e:ed60:29c:884c:4b52"</pre>
<p>This feature was inspired by Google's DNS lookup, i.e. <code>dig txt o-o.myaddr.l.google.com @8.8.8.8
+short</code>. There are also popular HTTP-based services for determining your public IP address:</p>
<ul>
<li>
<a href="http://icanhazip.com/">icanhazip.com</a> (<a href=
"https://major.io/2021/06/06/a-new-future-for-icanhazip/">backstory</a>)
</li>
<li>
<a href="https://ipify.org/">ipify.org</a>
</li>
<li>
<a href="https://ipinfo.io/">ipinfo.io (commercial)</a>
</li>
</ul>
<hr>
<h4 id="footnotes">Footnotes</h4>
<p><a id="status"><sup>[Status]</sup></a> A status of “build failing” rarely means the system is failing. It’s
@@ -229,16 +250,15 @@ Bootstrap core JavaScript ================================================== -->
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