Port 965 Unassigned - System Port

Port 965 is a System Port. Transport Protocol , Port 965 Service Name , Service Name Description: Unassigned.

Port	Protocol	Service Name	Description	Source
965			Unassigned	IANA
965	TCP UDP		Mac OS X RPC-based services, Used by NetInfo, for example	Apple.com

Port	Service Name	Description
880		Unassigned
916		Unassigned
3220	xnm-ssl	XML NM over SSL
4803	notateit	Notateit Messaging
5684		Reserved
6356		Unassigned
7013	microtalon-dis	Microtalon Discovery
7789	office-tools	Office Tools Pro Receive
8021	intu-ec-client	Intuit Entitlement Client
9606		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