Oct 9th, 2009
How to check if the port is associated with the official list of known services
How to check if the port is associated with the official list of known services.
Example:
This command returns no output. This indicates that while the port is in the reserved range (meaning 0 through 1023) and requires root access to open, it is not associated with a known service.
Next, check for information about the port using netstat or lsof. To check for port 834 using netstat, use the following command:
The lsof command reveals similar information since it is also capable of linking open ports to services:
These tools reveal a great deal about the status of the services running on a machine. These tools are flexible and can provide a wealth of information about network services and configuration. Consulting the man pages for lsof, netstat, nmap, and services is therefore highly recommended.
