common_netstat_cmds.md

Common Netstat Commands

Basic

netstat                     # show active connections

Listening Ports

netstat -l                  # show listening ports
netstat -ln                 # listening ports (no DNS)
netstat -lpn                # listening + process info

TCP / UDP

netstat -t                  # TCP connections
netstat -u                  # UDP connections
netstat -tu                 # TCP + UDP

Most Used

netstat -tulnp              # all listening ports with process

Established Connections

netstat -an | grep ESTABLISHED   # active established connections

By Port

netstat -tulnp | grep :80        # filter by port

By Process

netstat -tulnp | grep nginx      # filter by process

Routing

netstat -r                  # routing table

Interfaces

netstat -i                  # network interfaces

Statistics

netstat -s                  # protocol statistics

Continuous

netstat -c                  # live monitoring

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Note

netstat is deprecated on most modern systems

Use:

ss -tulnp