It has some cool options too. For example: http://sharingmyip.com/?site=ycombinator.com http://sharingmyip.com/?site=ycombinator.com It finds related sub-doma

It has some cool options too. For example: http://sharingmyip.com/?site=ycombinator.com http://sharingmyip.com/?site=ycombinator.com It finds related sub-domains being used, like wiki.ycombinator.com Or for Cisco: http://sharingmyip.com/?site=cisco.com http://sharingmyip.com/?site=cisco.com It shows that some of their external domains are pointed to internal addresses (in the 10.0 range).