Free Port Scanning Software

Does anyone know of a good free port scanning software package?  It will need to be compatible with Windows XP and/or 7.
deklinmAsked:
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pony10usConnect With a Mentor Commented:
nmap   http://nmap.org/

However you may want to move to the "free" version of Nessus as it will do vulnerability scan as well as port scan

http://www.tenable.com/products/nessus?gclid=CLKE-5Tw8rcCFSeCQgodxjMALg
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TvMptConnect With a Mentor Commented:
Angry ip Scanner
http://angryip.org/w/Download

No installation is needed - just save the program anywhere you like and run it from there.
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pony10usCommented:
@TvMpt:

Is this more an answer to the authors other question looking for an IP scanner?

It does look like a good product though.  :)
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TvMptCommented:
LOL. Your right its asking for port scanner and not ip scanner :D

Thats one of the tools i use and i make confusion.

Now the real alternative for your portscanner ( nessus is much more than a simple port scanner... )

Free Port Scanner 3.1.1
http://www.majorgeeks.com/files/details/free_port_scanner.html
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Darr247Commented:
Try TCPView, which is part of the SysInternals Suite.
It will show the status of all endpoints (sockets, which = IP+port#), including what the socket is on the other end of the connection.
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piyushranusriConnect With a Mentor System Cloud SpecialistCommented:
the best is PortQueryUI from Microsoft.
this is GUI and easy to use.

let me know if need download link.
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