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: 74.12.3.45
Hostname: bras-base-toroon0964w-grc-47-74-12-3-45.dsl.bell.ca
Hostname: bras-base-toroon2176w-grc-36-74-12-3-45.dsl.bell.ca
Hostname: bras-base-otwaon1093w-grc-15-74-12-3-45.dsl.bell.ca