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Sample Download : http://code.msdn.microsoft.com/How-to-list-active-network-daf8ff48

This sample shows the TCP and UDP endpoints on the current system. This sample only covers IPv4 endpoints.

The sample output is similar to output from netstat (-aon)

Sample output -

 Number of TCP end points (IPv4) - 38

 PID      LocalAddr      LocalPort      RemoteAddr      RemotePort      ConnState
 ===      =========      =========      ==========      ===========     ========

    4            0.0.0.0        80            0.0.0.0         0     LISTEN
 1004            0.0.0.0       135            0.0.0.0         0     LISTEN
    4            0.0.0.0       445            0.0.0.0         0     LISTEN
  668            0.0.0.0      1026            0.0.0.0         0     LISTEN
 1036            0.0.0.0      1027            0.0.0.0         0     LISTEN
 1144            0.0.0.0      1029            0.0.0.0         0     LISTEN
  744            0.0.0.0      1030            0.0.0.0         0     LISTEN
    4            0.0.0.0      5357            0.0.0.0         0     LISTEN
    4            0.0.0.0     47001            0.0.0.0         0     LISTEN
  728            0.0.0.0     65166            0.0.0.0         0     LISTEN

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 Number of UDP end points (IPv4)- 61

 PID            LocalAddr       LocalPort
 ===            =========       ==========
 1100            0.0.0.0        123
 1144            0.0.0.0        500
 1352            0.0.0.0        3702
 4896            0.0.0.0        3702
 1352            0.0.0.0        3702
 4896            0.0.0.0        3702
 1144            0.0.0.0        4500
 1228            0.0.0.0        5355
 1352            0.0.0.0        54225 

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