TorDNSEL lacks support for IPv6 addresses
$ dig -x $(dig +short tor-exit0-readme.dfri.se a) | egrep ^[None..None](../compare/None...None).\*PTR
20.193.25.171.in-addr.arpa. 86371 IN PTR tor-exit0-readme.dfri.se.
$ dig -x $(dig +short tor-exit0-readme.dfri.se aaaa | egrep ::) | egrep ^[None..None](../compare/None...None).\*PTR
0.2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.c.9.8.2.c.7.6.0.1.0.0.2.ip6.arpa. 86400 IN PTR tor-exit0-readme.dfri.se.
$ dig -x $(dig +short ipv6.google.com aaaa | egrep ::) | egrep ^[None..None](../compare/None...None).\*PTR
0.0.0.1.0.0.0.0.0.0.0.0.0.0.0.0.2.0.8.0.f.0.0.4.0.5.4.1.0.0.a.2.ip6.arpa. 86356 IN PTR arn02s05-in-x00.1e100.net.
$ dig +short 20.193.25.171.6667.4.3.2.1.ip-port.exitlist.torproject.org
127.0.0.2
$ dig +short 20.193.25.171.6667.e.0.0.2.0.0.0.0.0.0.0.0.0.0.0.0.5.0.8.0.f.0.0.4.0.5.4.1.0.0.a.2.ip-port.exitlist.torproject.org
$ dig +short 0.2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.c.9.8.2.c.7.6.0.1.0.0.2.ip6.arpa.6667.4.3.2.1.ip-port.exitlist.torproject.org
$
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