617 SCO Desktop Administration Server - System Port

617 is a System Port. Transport Protocol TCP UDP , 617 Service Name sco-dtmgr, Service Name Description: SCO Desktop Administration Server.

Port	Protocol	Service Name	Description	Source
617	TCP UDP	sco-dtmgr	SCO Desktop Administration Server	IANA
617	TCP UDP		Mac OS X RPC-based services, Used by NetInfo, for example	Apple.com
617	TCP UDP	sco-dtmgr	SCO Desktop Administration Server	bekkoame

Port	Service Name	Description
3735	pwdis	Password Distribution
4833		Unassigned
5516		Unassigned
6094		Unassigned
6386		Unassigned
6392		Unassigned
7323	swx	The Swiss Exchange
7693		Unassigned
7811		Unassigned
8229		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