open ports checker

I need tool or software to check the open ports in some IPs or websites..
I tried the online checker..but i didn't find my goal...

please any help ???
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yousef_adAsked:
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jahboiteCommented:
Take a look at Nmap http://nmap.org
Once you've installed it, you can use the Nmap GUI (known as Zenmap) which has pre-defined scan configurations which you might find useful or you can simply simply perform scans from the command line.
Documentation at http://nmap.org/book/man.html
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IanThCommented:
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IanThCommented:
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IanThCommented:
sorry i didn't see your trying external ip and websites
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IanThCommented:
what is your issue
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up_grayed_outCommented:
Well, the real question is what sites/IPs. Are they ones you own, or that you have permission to scan?
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yousef_adAuthor Commented:
I want to check the healthy for my system in my work..I want to know if any gap or any weak security in my system...
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Muhammed-RummanehCommented:

Dear yousef_ad

Information:
A port scanner is a software application designed to probe a network host for open ports. This is often used by administrators to verify security policies of their networks and by attackers to identify running services on a host with the view to compromise it. To portscan a host is to scan for listening ports on a single target host. To portsweep is to scan multiple hosts for a specific listening port. The latter is typically used in searching for a specific service, for example, an SQL-based computer worm may portsweep looking for hosts listening on TCP port 1433.

Please download this program :
http://www.radmin.com/products/utilities/portscanner.php
http://www.t1shopper.com/tools/port-scan/
http://www.angryip.org/w/Home

Good Luck
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yousef_adAuthor Commented:
thanx
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