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think my brain's gone to sleep! thankyou...

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closed as not a real question by Lucas Kauffman, Tim Brigham, voretaq7 Jul 29 '12 at 8:21

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

Can you be more specific? – Khaled Dec 13 '10 at 17:15

If they don't have reverse dns pointing to them then you can't. It is a one way lookup.

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There is no single database with all DNS records. There are several tools out of here (mostly not free) which shows a list of domains associated with an IP address.

One of them is has IP-address gives:

Reverse IP: 31 websites use this address. (examples:

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Robtex is a pretty good site for that but you cannot have any guarantee another dns server dosen't have a different record for it.

Any DNS server can have a record for a zone even if it has no authority on it, the "small" drawback is, only clients of this DNS server will get this particular record, no replication will occur outside this particular authority.

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