# To view which users/processes are listening to which ports: sudo netstat -lnptu # To view routing table (use -n flag to disable DNS lookups): netstat -r # Which process is listening to port <port> netstat -pln | grep <port> | awk '{print $NF}' Example output: 1507/python # Fast display of ipv4 tcp listening programs sudo netstat -vtlnp --listening -4