TCP Port Interrogator

TCP Port Interrogator is a user-friendly network tool with a graphical user interface designed to help you determine whether a number of TCP ports are open or allowing persistent connections to a remote destination.

After specifying the destination IP address to scan, you can optionally specify individual ports to scan (comma separated) and/or specify a range of ports to scan (hyphenated).
For example: to scan ports 80, 1080, and 400 to 800, you would specify "80,1080,400-800" in any order, the priority does not depend on the software and only those ports will be scanned.