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eri
Asked: 2014-01-03 04:19:07 +0800 CST

How to find if there is ....in-addr.arpa delegated?

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I have a pool of IP addresses, but reverse DNS does not works. It works if lookup on namserver but does not work on Internet.

I requested registrar to delegate this pool to ns1.example.com. I added net IN NS ns1.example.com on domain dns-hosting. I added PTRs to ipXXX.net.example.com to bind running on ns1.example.com.

# host a.b.c.17
Host 17.26.18.37.in-addr.arpa. not found: 3(NXDOMAIN)
# dig +short 17.b.c.a.in-addr.arpa.
# dig +short b.c.a.in-addr.arpa.
# dig +short b.c.in-addr.arpa.

dig +short is empty, without short it points to RIPE.

bind

1 Answers

  1. Best Answer

    It depends a bit on the size of your subnet and the policies of your ISP if they will actually delegate the PTR records to your name servers or only allow you to supply your desired hostnames for the reverse records and they will manage the reverse zone themselves.

    Either way you can use the trace option in dig to check/verify if the delegation is set up as you expected with: dig +trace -x your.ip.address

    +[no]trace .... Toggle tracing of the delegation path from the root name servers for the name being looked up. >snip< When tracing is enabled, dig makes iterative queries to resolve the name being looked up. It will follow referrals from the root servers, showing the answer from each server that was used to resolve the lookup.

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