What are the standard IANA port range categories, and which range do web proxy servers like Squid typically use when configured on port 3128?

• A.IANA has only two ranges: well-known (0-1023) and dynamic (1024-65535). Port 3128 is dynamic.
• B.Port 3128 falls in the Well-Known range (0-1023); Squid must run as root to use it.
• C.Port 3128 is in the Ephemeral range (49152-65535); it is randomly assigned to Squid each time it starts.
• D.IANA defines: 0-1023 (System/Well-Known ports, reserved for standard services, requires root/admin privileges); 1024-49151 (Registered/User ports, for applications registered with IANA); 49152-65535 (Dynamic/Ephemeral/Private ports, for client source ports). Port 3128 falls in the Registered port range (1024-49151) and is the default port for Squid proxy server.