3939 Anti-virus Application Management Port - User Port

3939 is a User Port. Transport Protocol TCP UDP , 3939 Service Name aamp, Service Name Description: Anti-virus Application Management Port.

Port	Protocol	Service Name	Description	Source
3939	TCP UDP	aamp	Anti-virus Application Management Port	IANA
3939	TCP UDP	aamp	Anti-virus Application Management Port	bekkoame

Port	Service Name	Description
2664	patrol-mq-gm	Patrol for MQ GM
3797	idps	idps
3809	apocd	Java Desktop System Configuration Agent
4163	silverpeakpeer	Silver Peak Peer Protocol
5124		Unassigned
6023	x11	X Window System
6880		Unassigned
7121	virprot-lm	Virtual Prototypes License Manager
7177		Unassigned
7822		Unassigned

A port is an endpoint of communication in an operating system. While the term is also used for hardware devices, in software it is a logical construct that identifies a specific process or a type of service.

Port numbers are assigned in various ways, based on three ranges: System Ports (0-1023), User Ports (1024-49151), and the Dynamic and/or Private Ports (49152-65535);

The Well Known Ports are assigned by the IANA and on most systems can only be used by system (or root) processes or by programs executed by privileged users. Ports are used in the TCP [RFC793] to name the ends of logical connections which carry long term conversations. For the purpose of providing services to unknown callers, a service contact port is defined. This list specifies the port used by the server process as its contact port. The contact port is sometimes called the "well-known port". To the extent possible, these same port assignments are used with the UDP [RFC768]. The range for well-known ports managed by the IANA is 0-1023.
DYNAMIC AND/OR PRIVATE PORTS Registered Ports are those from 1024 through 49151.
The Dynamic and/or Private Ports are those from 49152 through 65535