Ever few weeks, I see some post about people asking for service scanners and vulnerability scanners.

Well, I found one. Its called "Service Spy" and its a command-line utility, and it will scan for any application servers, or common services running on your computer. It has good reporting, and a generally great utility. I recommend it for everyone who uses Windows NT/2K/XP.

Service Spy

Check the website out, pilanet.com

Also, check out their 'IP Subnet Calculator ', by the same company.