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: 46.255.231.129
Hostname: static-redir.v.eint.cz
Hostname: prace-pool.centrum.cz
Hostname: centrum.cz
Hostname: ella-cz-fe.centrum.cz