This is a quick reference on how to check what ports are listening using the netstat – l command on Linux Based Operating Systems.
1. netstat -l
Proto refers to network protocol either tcp or udp, local address you will see the port that is currently listening and under state it will advise that the port is listening (LISTEN).
root@GNS3-Server:/tmp# netstat -l Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 *:3080 *:* LISTEN tcp 0 0 *:http *:* LISTEN tcp 0 0 192.168.122.1:domain *:* LISTEN tcp 0 0 *:ssh *:* LISTEN tcp 0 0 *:8003 *:* LISTEN tcp6 0 0 [::]:http [::]:* LISTEN tcp6 0 0 [::]:ssh [::]:* LISTEN
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