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";
}