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IP Port Scanner
IP Port Scanner allows you to find security holes and check a host or IP for an open or listening port in their own sysmtes. To scan a host just enter the host name or the IP address in the box and give a range of ports to scan.
IP Port Scanner is a small, fast, robust and easy-to-use port scanner for Windows platform. It contains descriptions for common ports, and can perform scans on predefined port ranges. You can test your ports to make sure they are accessable from the outside world with this free tool.