Linux contains a lot of command line tools which make the job of a network administrator easier. One of them is netstat. Netstat is a multi-purpose network information tool. Using netstat, you can find which port is used by which process or user by using the following command:
# netstat -an | more
example : let say i would like to verify that, how own the telnet port
# netstat -nap | grep :23
There is a utility/command and called 'fuser' which also tells you which user and process owns a port
# fuser -v -n tcp 23
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