Re: Lookup of IP Address

[Jeffery.Gieser () minnesotamutual com]

Mohamed,

nslookup is an excellent tool for this.  Do the following.

nslookup

This will put you in interactive mode.

> 10.1.1.1

Insert your IP address in the place of 10.1.1.1.  If there is a PTR record
for that IP address you will be given the host name.  You probably will not
find a PTR record since they are not done for dial-up accounts or most DSL,
Cable Modem, ect. accounts.

So do the following instead.

> set query=ns

> 1.1.10.in-addr.arpa

Insert your reversed class c network in the place of 1.1.10.  Here you are
looking for the authoritative name server of the class c address space for
the 10.1.1.1 address.  If you find nothing then try the class b address
space

> 1.10.in-addr.arpa

If you find nothing then try the class a address space.

> 10.in-addr.arpa

This has always helped me when trying to track down an IP address on the
Internet.  If you want to learn more about DNS and nslookup try DNS and
Bind 3rd Edition by O'Reilly (nslookup chapter 12).  You can also read the
man page (man nslookup) on a UNIX box.  nslookup is supported by all UNIXes
I have worked on and Windows.

Regards,
Jeffery Gieser



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