Linux – find listening ports

Sometimes it is useful to find what ports a machine is listening to. Here are some use cases:

Display listening ports

$ netstat -l

Display listening ports with numeric address/port values

$ netstat -nl

Display listening tcp ports

Use -t for tcp

$ netstat -nlt

Display listening udp ports

Use -u for udp

$ netstat -nlu

Display IP v6 ports

Use -6 for IP v6

$ netstat -nl -6

Display IP v4 ports

Use -4 for IP v4

$ netstat -nl -4
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