Getting the FQDN given an IP address

[Taz]

I have been tasked to find the FQDN (Fully Qualified Domain Name) associated with a given IP address.

For example, if a machine has two NICs with the following IP addresses:

- 1.1.1.1

- 1.1.1.2

Then the FQDN may be registered as:

- external.acme.com (for 1.1.1.1)

- internal.acme.com (for 1.1.1.2)

Is there a way to determine the FQDN associated with an IP address across a range of platforms (wg. Windows, Solaris, Linux, HP-UX, etc)? I would imagine that 'nslookup' would be a useful command for this?

[TiG]

You are using internal DNS servers?.

If so go look at those....

TiG

[directhex]

i think "host" is the usual command these days

[TheAnimus]

there are ports for DIG for practically every platform. More powerful than NSlookup.

dig -x 1.1.1.1

[TheAnimus]

hex, Host won't return multiple adapters will it? and depending on the config, not the FQDN.

[Taz]

Nice one directhex. 'Host' is available on Linux and Solaris so that will be very useful.

[Taz]

there are ports for DIG for practically every platform. More powerful than NSlookup.

dig -x 1.1.1.1

Thanks for that. Very useful too.

[Jay]

if your using DNS you could use look@LAN

[badass]

A quick and dirty way that works on windows is type ping -a x.x.x.x