netstat (network statistics) is a command-line tool that displays network connections (both incoming and outgoing), routing tables, and a number of network interface statistics.

It is used for finding problems in the network and to determine the amount of traffic on the network as a performance measurement. It can also be used to find the open / listening ports on your system.

Using Netstat

Display all active TCP connections and the TCP and UDP ports on which the computer is listening.

$ netstat -a

Show only listening sockets (TCP and UDP)

$ netstat -l

Display open ports and established TCP connections

$ netstat -vatn

Same for UDP connections

$ netstat -vaun

-n option shows the numeric address. If you want to see the Fully Qualified Domain Name (FQDN) addresses instead, omit the option n from the above commands.

Display a table of all network interfaces

$ netstat -i

Display a table of kernel routing tables

$ netstat -r

Netstat is a cross platform tool and is available for Windows, Linux and Mac OS X.

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