What is the maximum port number for privileged ports?

Privileged ports are defined by the Internet Assigned Numbers Authority (IANA) and are specifically designated for use by network services that run with administrative or root privileges. The range for privileged ports is from 0 to 1023. This means that any port number from 0 to 1023 requires elevated privileges to be used by processes.

In various operating systems, including Linux, this convention ensures that standard and well-known services like HTTP (port 80), FTP (port 21), and SSH (port 22) can operate properly and securely, preventing unprivileged users from starting services on these ports without authorization.

Therefore, the correct answer is that the maximum port number for privileged ports is indeed 1023.