902 self documenting Telnet Door - System Port

902 is a System Port. Transport Protocol TCP , 902 Service Name ideafarm-door, Service Name Description: self documenting Telnet Door.

Port	Protocol	Service Name	Description	Source
902	TCP	ideafarm-door	self documenting Telnet Door	IANA
902	UDP	ideafarm-door	self documenting Door: send 0x00 for info	IANA
902	TCP UDP		ideafarm-door,Official	wikipedia
902	TCP UDP		VMware Server Console (from management console to managed device),Unofficial	wikipedia
902	TCP UDP		Mac OS X RPC-based services, Used by NetInfo, for example	Apple.com
902			Net-Devil, Pest	simovits.com
902	TCP UDP	ideafarm-chat	IDEAFARM-CHAT	bekkoame

Port	Service Name	Description
740		Unassigned
773	submit
1530	rap-service	rap-service
2086	gnunet	GNUnet
2848	amt-blc-port	AMT-BLC-PORT
2901	allstorcns	ALLSTORCNS
4466		Unassigned
4768		Unassigned
4899	radmin-port	RAdmin Port
5130		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