Port Scanner Websites
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Nmap: the Network Mapper - Free Security Scanner
Nmap Free Security Scanner, Port Scanner, & Network Exploration Tool. Download open source software for Linux, Windows, UNIX, FreeBSD, etc.
Not Applicable 
$ 8.95
Advanced Port Scanner – free and fast port scanner
Advanced Port Scanner is a free port scanner allowing you to quickly find open ports on network computers and retrieve versions of programs running on the detected ports
307,812 $ 30,240.00