637 lanserver - System Port | Service Name:lanserver

637 is a System Port. Transport Protocol TCP UDP , 637 Service Name lanserver, Service Name Description: lanserver.

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

Port	Service Name	Description
264	bgmp	BGMP
1639	cert-initiator	cert-initiator
2515	facsys-router	Facsys Router
5685		Unassigned
6821		Unassigned
7083		Unassigned
7114		Unassigned
9040		Unassigned
9171		Unassigned
9336		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