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The Netstat.exe utility has a new switch, the -o switch, that an be used to determine which process identifier (ID) (program) listens on a given port. For example, the netstat -ano command can produce the following output:

C:\Documents and Settings\blin>netstat -ano

Active Connections

Proto Local Address Foreign Address State PID
TCP 0.0.0.0:25 0.0.0.0:0 LISTENING 388
TCP 0.0.0.0:80 0.0.0.0:0 LISTENING 388
TCP 0.0.0.0:135 0.0.0.0:0 LISTENING 980
TCP 0.0.0.0:443 0.0.0.0:0 LISTENING 388
TCP 0.0.0.0:445 0.0.0.0:0 LISTENING 4
TCP 0.0.0.0:1029 0.0.0.0:0 LISTENING 388
TCP 0.0.0.0:3389 0.0.0.0:0 LISTENING 920
TCP 0.0.0.0:5800 0.0.0.0:0 LISTENING 1264
TCP 0.0.0.0:5900 0.0.0.0:0 LISTENING 1264

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How to find open ports on a computer Windows Tools The 2003 Netstat.exe utility has a new switch, the -o switch, that can display ... For example, the netstat -ano command can produce the following output: ... www.howtonetworking.com/Windows/wintools.htm