To view the ports in Windows 2000/XP/Server 2003, you can use the Netstat command:

Click "Start → Run" in turn, enter "cmd" and press enter to open the command prompt window. Type "netstat -a -n" at the command prompt, and then press Enter to view the port number and status of TCP and UDP connections displayed in digital form.

Tip: the usage of Netstat command

Command format: Netstat -a -e -n -o -s

-a shows all active TCP connections and TCP and UDP ports that the computer listens to.

-e indicates the number of bytes and packets sent and received by Ethernet.

-n indicates that only the addresses and port numbers of all active TCP connections are displayed in digital form.

-o displays the active TCP connections, including the process ID(PID) of each connection.

-s indicates that statistics of various connections, including port numbers, are displayed by protocol.