Continuing this thread:
Long pointer records like the following aren't easily resolvable
by dig but their embedded IPv6 addresses are plainly visible:
2001-1c05-0001-e6e5-99c1-3191-b0e7-aca8.cable.dynamic.v6.ziggo.nl
2806-1000-0001-ae95-7768-0cea-3f9e-7ba0.ipv6.infinitum.net.mx
2603-6000-0001-60a5-1f58-fd79-7344-53fc.res6.spectrum.com
2a02-8388-57ba-fb8e-f2f7-e78c-7468-2b2c.cable.dynamic.v6.surfer.at
2001-b011-0001-4a39-6db8-b711-8a27-3281.dynamic-ip6.hinet.net
dynamic-2a00-1028-7f41-b8de-5e49-2809-729d-0736.ipv6.broadband.iol.cz
These addresses can be recovered with an awk script and some obvious editing:
awk '{print $1}' 'LongNames.txt' | sed 's/\-/\:/g' > LongNamesIPv6.txt
Here's one from which the separators (:) have been removed:
2a01cb0c000110f46cbc7ba4c95fcb23.ipv6.abo.wanadoo.fr
That's a bit more challenging and can be solved by trial-and-error
relocation of the separators until dig -x returns the original hostname:
dig -x 2a01:cb0c:0001:10f4:6cbc:7ba4:c95f:cb23 ==> IN
PTR 2a01cb0c000110f46cbc7ba4c95fcb23.ipv6.abo.wanadoo.fr
