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I have an IP address, xx.xx.xx.xx, for which ping works. But when I do an nslookup for that IP address it is failing. Is there a way to find the domain name of the machine with the IP address xx.xx.xx.xx?

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  1. The machine will not necesserily have a domain name.
  2. Try traceroute
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The only way to do this is via a reverse DNS lookup. However, if you are saying that nslookup is failing then (unless there is a local issue with you having bad DNS servers listed on your local machine), then a reverse lookup will not work.

The various tools that other posters have mentioned, all ultimately do exactly the same the nslookup will do from your machine. They do a reverse DNS lookup via the "in-addr.arpa" address range (this is a special domain reserved in DNS for reverse lookups).

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You need to use a "reverse DNS lookup". Try this one online, or Google further for other options.

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Yep, it's called Reverse DNS! Perhaps try: http://remote.12dt.com/

Also consider DNSStuff: http://www.dnsstuff.com/ great website for troubleshooting DNS issues.

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  • I doubt this will work. nslookup is doing exactly this type of reverse lookup when yu type in an ip address. Unless there is a local issue on the client with DNS entries, it will yield the same results. – Rob Levine Jan 5 '10 at 13:19
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In order for an IP address to resolve to a hostname, a PTR record must exist in DNS. For example:

234.9.96.65.in-addr.arpa. 3570  IN      PTR     h00c0f06bacf1.ne.client2.attbi.com.

The ISP that owns the netblock including your IP (or its delegated zone authority) must set this up.

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