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: 68.15.100.25
Hostname: wsip-68-15-100-25.ok.ok.cox.net
Hostname: OKCNC1-UBR1-3-hfc-0251-d1dbf42b.rdc1.ok.coxatwork.com
Hostname: mail.delcoelectric.com