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First, obtain the Process ID (PID) of the service in question. Please consult this article to obtain the PID of a specific service.

Once you've obtained the PID, visit a command prompt and type:

netstat -ano

The output will look similar to this:

  Proto  Local Address          Foreign Address        State          PID
  TCP    0.0.0.0:80            0.0.0.0:0              LISTENING      2656
  TCP    0.0.0.0:135            0.0.0.0:0              LISTENING      332
  TCP    0.0.0.0:443            0.0.0.0:0              LISTENING      2656
  TCP    0.0.0.0:445            0.0.0.0:0              LISTENING      4
  TCP    0.0.0.0:1025          0.0.0.0:0              LISTENING      796
  TCP    0.0.0.0:2869          0.0.0.0:0              LISTENING      660
  TCP    0.0.0.0:3389          0.0.0.0:0              LISTENING      372
  TCP    0.0.0.0:5298          0.0.0.0:0              LISTENING      2900
  TCP    0.0.0.0:46074          0.0.0.0:0              LISTENING      2656
  TCP    127.0.0.1:4061        127.0.0.1:4062        ESTABLISHED    2388
  TCP    127.0.0.1:4062        127.0.0.1:4061        ESTABLISHED    2388

Look for the lines in the state LISTENING. Then match the PID against the process list to find out which process is listening on which ports. Alternately you can type:

netstat -anob

This will give you a listing similar to the following:

Active Connections
 
  Proto  Local Address          Foreign Address        State          PID
  TCP    0.0.0.0:80            0.0.0.0:0              LISTENING      2656
  [Skype.exe]
 
  TCP    0.0.0.0:135            0.0.0.0:0              LISTENING      332
  RpcSs
  [svchost.exe]
 
  TCP    0.0.0.0:443            0.0.0.0:0              LISTENING      2656
  [Skype.exe]
 
  TCP    0.0.0.0:445            0.0.0.0:0              LISTENING      4
  [System]
 
  TCP    0.0.0.0:1025          0.0.0.0:0              LISTENING      796
  [lsass.exe]