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Just as the title reads: How do I discover what nameserver is the authoritative nameserver for PTR records for a specific IP?

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4 Answers

up vote 3 down vote accepted

Or another way using nslookup on an address in the 216.239.32.0 subnet:

set type=ns
32.239.216.in-addr.arpa

Which will give you a list of name-servers for that reverse-lookup domain.

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Thanks, might need that someday. –  CarpeNoctem Nov 29 '10 at 6:44
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Sorry it's kind of obvious, it's late give me a break.

dig XX.XX.XX.in-addr.arpa. will reply with the SOA if one has been assigned.

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DNSStuff.com is a great place - their free tool will show this - as well as some other information for who is responsible for the IP Space - in case you need abuse contact details.

Don't worry - we all know how those late nights go...

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IF you are using Linux, try 'dig -x '.

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Please read the question again if you could. I don't want to perform a reverse lookup. I want to know who the authoritative nameserver is given a specific delegation of IP space. –  CarpeNoctem Nov 29 '10 at 6:37
    
dig -x would show you that, might not be the best solution but as far as I know it gives you the NS handling the address.<br>dig -x 8.8.8.8 tells ns1 and ns3.level3.net. dig SOA -x 8.8.8.8 will show same information as a dig in-addr.arpa. –  3molo Nov 29 '10 at 17:34
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