<div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif">Dan Wing has been tracking these for years. You can see the current set and history of these going back to 2009:</div><div class="gmail_default" style="font-family:tahoma,sans-serif"><a href="https://www.employees.org/~dwing/aaaa-stats/" target="_blank">https://www.employees.org/~dwing/aaaa-stats/</a></div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">Current set from Alexa top-N is <a href="https://www.employees.org/~dwing/aaaa-stats/ipv6-map.2023-07-29_0800.txt">https://www.employees.org/~dwing/aaaa-stats/ipv6-map.2023-07-29_0800.txt</a> <br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">contains mostly this case right now, but also a few others from <a href="http://opendns.com">opendns.com</a>:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="gmail_default" style="font-family:tahoma,sans-serif"><pre><a href="http://bam-cell.cell.nr-data.net">bam-cell.cell.nr-data.net</a> has IPv4 has IPv6 ::ffff:162.247.243.30 (errno=22) (time=0.000037)
<a href="http://bam-cell.nr-data.net">bam-cell.nr-data.net</a> has IPv4 has IPv6 ::ffff:162.247.243.30 (errno=22) (time=0.000005)
<a href="http://bam.cell.nr-data.net">bam.cell.nr-data.net</a> has IPv4 has IPv6 ::ffff:162.247.243.29 (errno=22) (time=0.000007)
<a href="http://bam.eu01.nr-data.net">bam.eu01.nr-data.net</a> has IPv4 has IPv6 ::ffff:185.221.87.23 (errno=22) (time=0.000003)
<a href="http://bam.nr-data.net">bam.nr-data.net</a> has IPv4 has IPv6 ::ffff:162.247.243.29 (errno=22) (time=0.000006)
<a href="http://block.opendns.com">block.opendns.com</a> has IPv4 has IPv6 ::ffff:208.67.219.157 (errno=22) (time=0.000003)
<a href="http://bpb.opendns.com">bpb.opendns.com</a> has IPv4 has IPv6 ::ffff:208.67.219.158 (errno=22) (time=0.000006)
<a href="http://fastly-mobile-collector.newrelic.com">fastly-mobile-collector.newrelic.com</a> has IPv4 has IPv6 ::ffff:162.247.243.24 (errno=22) (time=0.000003)
<a href="http://fastly-tls12-bam-cell.nr-data.net">fastly-tls12-bam-cell.nr-data.net</a> has IPv4 has IPv6 ::ffff:162.247.243.30 (errno=22) (time=0.000002)
<a href="http://fastly-tls12-bam.nr-data.net">fastly-tls12-bam.nr-data.net</a> has IPv4 has IPv6 ::ffff:162.247.243.29 (errno=22) (time=0.000003)
<a href="http://malware.opendns.com">malware.opendns.com</a> has IPv4 has IPv6 ::ffff:208.67.219.152 (errno=22) (time=0.000004)</pre></div></blockquote><div><div style="font-family:tahoma,sans-serif" class="gmail_default">As long as you have IPv4 on a client then most clients seem to just work.</div><div style="font-family:tahoma,sans-serif" class="gmail_default">Amusingly, curl will actually connect to this with "-6" but will just use IPv4 (which might be a bug):</div><div style="font-family:tahoma,sans-serif" class="gmail_default"><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="font-family:tahoma,sans-serif" class="gmail_default"><span style="font-family:monospace">$ curl -v -6 <a href="http://bam-cell.nr-data.net">bam-cell.nr-data.net</a> <br>* Trying ::ffff:162.247.243.30:80...<br>* TCP_NODELAY set<br>* Connected to <a href="http://bam-cell.nr-data.net">bam-cell.nr-data.net</a> (::ffff:162.247.243.30) port 80 (#0)<br>> GET / HTTP/1.1<br>> Host: <a href="http://bam-cell.nr-data.net">bam-cell.nr-data.net</a><br>> User-Agent: curl/7.68.0</span></div><div style="font-family:tahoma,sans-serif" class="gmail_default"><span style="font-family:monospace">[...]</span></div></blockquote><div style="font-family:tahoma,sans-serif" class="gmail_default"><br></div><div style="font-family:tahoma,sans-serif" class="gmail_default"><br></div><br></div><div> </div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jul 28, 2023 at 1:05 AM Thomas Schäfer <<a href="mailto:thomas@cis.uni-muenchen.de" target="_blank">thomas@cis.uni-muenchen.de</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi,<br>
<br>
Thank you for answers so far.<br>
Since the support case is public and you may interested in bad <br>
entertainment (today is SysAdminDay)<br>
<br>
You can read it here:<br>
<br>
<a href="https://forum.newrelic.com/s/hubtopic/aAX8W0000015BUvWAM/bamnrdatanet-resolves-with-wrong-aaaarecords" rel="noreferrer" target="_blank">https://forum.newrelic.com/s/hubtopic/aAX8W0000015BUvWAM/bamnrdatanet-resolves-with-wrong-aaaarecords</a><br>
<br>
My today's highlight is:<br>
<br>
"We did this to drive down the cost with our DNS provider. Queries for <br>
AAAA records that didn't exist, followed by queries for A records, was <br>
costing us significantly and we needed to alleviate that."<br>
<br>
Just one comment to the players there:<br>
<br>
"new relic" is providing that service to Postbank/DeutscheBank (and <br>
probably more)<br>
<br>
ns1, the service with high costs for none existing AAAA-Records, is a <br>
IBM company.<br>
<br>
Big companies big mistakes....<br>
<br>
Have a nice weekend!<br>
<br>
Thomas<br>
<br>
<br>
<br>
<br>
<br>
-- <br>
<br>
There’s no place like ::1<br>
<br>
Thomas Schäfer (Systemverwaltung)<br>
Ludwig-Maximilians-Universität<br>
Centrum für Informations- und Sprachverarbeitung<br>
Oettingenstraße 67 Raum C109<br>
80538 München ☎ +49/89/2180-9706 ℻ +49/89/2180-9701<br>
<br>
<br>
</blockquote></div>