I recently added name resolution support to ldap-stats.pl. This was super easy to do, and only required three lines of Perl code:
## Import the required modules
use Socket;
## Convert the IP address string to an Internet address
my $ipaddr = inet_aton($index);
## Resolve the IP address to a hostname
my $host = gethostbyaddr($ipaddr, AF_INET);
Once the conversion and resolution complete, the name will be available in the $host scalar variable. Giddie up!