"Whois" for Windows 95/98/NT V1.5.0.15
URL: http://www.netservs.com/library/

If you've got any sort of trouble with an Internet domain, "Whois" is useful. It indicates if the domain actually exists, the people or organization behind it and often gives their alternative contact details. It's useful for more advanced spam tracking but it's handy in its own right. 

It requires an Internet connection and 32 bit Windows.