Port 406 Interactive Mail Support Protocol - System Port

Port 406 is a System Port. Transport Protocol TCP UDP , Port 406 Service Name imsp, Service Name Description: Interactive Mail Support Protocol.

Port	Protocol	Service Name	Description	Source
406	TCP UDP	imsp	Interactive Mail Support Protocol	IANA
406	TCP UDP	imsp	Interactive Mail Support Protocol	bekkoame

Port	Service Name	Description
270		Reserved
681	entrust-aams	entrust-aams
1894	o2server-port	O2Server Port
2039	prizma	Prizma Monitoring Service
2235	sercomm-wlink	Sercomm-WLink
3864	asap-tcp-tls	asap/tls tcp port
4008	netcheque	NetCheque accounting
4551	ieee-mih	MIH Services
5110		Unassigned
6099	raxa-mgmt	RAXA Management

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