900 OMG Initial Refs - System Port | Service Name:omginitialrefs

900 is a System Port. Transport Protocol TCP UDP , 900 Service Name omginitialrefs, Service Name Description: OMG Initial Refs.

Port	Protocol	Service Name	Description	Source
900	TCP UDP	omginitialrefs	OMG Initial Refs	IANA
900	TCP UDP		Mac OS X RPC-based services, Used by NetInfo, for example	Apple.com
900	TCP UDP	omginitialrefs	OMG Initial Refs	bekkoame

Port	Service Name	Description
2830	silkp2	silkp2
5576		Unassigned
6046	x11	X Window System
6861		Unassigned
7154		Unassigned
9813		Unassigned
10216		Unassigned
10267		Unassigned
10588		Unassigned
11144		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