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Open Port Check

Created: 27 Apr 2012 • Updated: 27 Apr 2012
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This Open Port Check will serve as a free utility for remotely verifying a port is open or closed. This online tool help you to check your external IP address and detect open ports on your connection or you can check if your server applications are being blocked by a firewall.

For more a comprehensive list of TCP and UDP ports, check this Wikipedia article.

Link :  Open Port Check