Reverse DNS Lookup
This tool will provide you the hostname (ie www.yahoo.com) of the IP address that you enter below.
Results:
Lookup on IPv4 Address: 129.187.254.228
Hostname: cs.tum.de
Hostname: tum.de
Hostname: idpx.lfe.ed.tum.de
Hostname: warr.de
Hostname: warr.space
Hostname: rehyb.eu
Hostname: wwwv4.tum.de
Hostname: living.tum.de
Hostname: move2space.de
Hostname: tu-muenchen.de