I agree with you that Net::DNS is the way to go, but I also agree with the poster above that there's, many times, more than one PTR. Also, it would seem the parent poster is looking for PTR records, not A records. I sometimes lookup the A records for a PTR to see if they match...

UPDATE: After reading the update to the question I deleted much of this post and put this instead. It might even be what the asker wants, or close to it...

use strict;
use Net::DNS;

my $res = new Net::DNS::Resolver;
for my $rr ($res->axfr('domain.name')) {
    next unless $rr->type eq "A";

    my $host = $rr->name;
    my $ip   = $rr->address;

    next unless $ip eq "ip.ip.ip.ip";

    print "$host\n";
}

[download]

In reply to Re^2: Retrieving all hostnames for an IP address... by jettero
in thread Retrieving all hostnames for an IP address... by RMaxwell

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.