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: 138.246.224.249
Hostname: mediatum.ub.tum.de
Hostname: tuzebib-mediatum1.srv.mwn.de
Hostname: tuzebib.mediatum1.srv.mwn.de