Show which process/program is listening to what port using netstat and lsof

lsof -Pnl +M -i4
lsof -Pnl +M -i6

or

netstat -tulpn
netstat -npl

There are obviously a number of ways to accomplish this, but these variations will cover a lot of ground. You can also combine this with grep to filter out things you don’t need to see, or to only include specific processes and/or ports.

See post from @geek1968 on Instagram

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