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: 134.147.250.184
Hostname: dp.ruhr-uni-bochum.de
Hostname: www.physik.ruhr-uni-bochum.de
Hostname: tp3.ruhr-uni-bochum.de
Hostname: physik.ruhr-uni-bochum.de