PTR using DIG

[Kevin Darcy]

BIJU KURIAN wrote:

>How can i see the PTR record for a host..
>
>dig host1.doma.com @ns1.domain.com PTR doesn't show the details..
>
>Is there someother ways to see the PTR recoring working fine or not?
>
If host1.doma.com owns a PTR record, then dig host1.doma.com will show 
it. But, normally PTR records exist solely for reverse lookups and are 
therefore found under the in-addr.arpa tree; you typically wouldn't see 
one under the .com tree unless it is aliased from somewhere under the 
in-addr.arpa tree.

You can simulate a reverse lookup in dig by reversing the octets of the 
address,  appending ".in-addr.arpa" to the result, and then querying 
whether that name owns any PTR records, e.g. reverse lookup of 1.2.3.4 
-> dig 4.3.2.1.in-addr.arpa ptr. Most versions of dig also have a -x 
option that does the grunt work of reversing and appending, e.g. dig -x 
1.2.3.4 ptr, and some versions of dig even default to looking up PTR 
records when the -x option is used, so maybe the command is as simple as 
dig -x 1.2.3.4. Give it a try.

                                                                         
                                                - Kevin