How to check Port status under Linux

This article will explain in detail how to check the port status under Linux. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

1. View the status of a specific port number. If you are a non-root user, add sudo before the command.

Netstat-anp | grep port number

Assuming that the port number is 3306, the result of executing the command is as follows:

Tcp 0 0 0.0.0.0 3306 0.0.0.015 * LISTEN 26661/mysqld

As shown above, the monitoring status of LISTEN indicates that it is occupied, and the last column shows that it is occupied by the service mysqld. two。 View the status of all ports that are currently in use.

Netstat-nultp

The result after executing the command is as follows:

Tcp 0 0 0.0.0. 0 LISTEN 2136/sshdudp 3306 0.0.0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0 of the LISTEN 1973/dhclient of LISTEN 2136/sshdudp 0 0. 0. 0. 0. 0. 0. 0. 0.

As shown above, we can see that ports 3306, 22, and 68 are all occupied, while ports that are not displayed or whose monitoring status is not LISTEN indicate that they are not occupied.

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