687 asipregistry - System Port | Service Name:asipregistry

687 is a System Port. Transport Protocol TCP UDP , 687 Service Name asipregistry, Service Name Description: asipregistry.

Port	Protocol	Service Name	Description	Source
687	TCP UDP	asipregistry	asipregistry	IANA
687	TCP UDP		Mac OS X RPC-based services, Used by NetInfo, for example	Apple.com
687	TCP		Server administration, Server administration tools for Mac OS X Server v10.6 and earlier, including AppleShare IP.	Apple.com
687	TCP UDP	asipregistry	asipregistry	bekkoame

Port	Service Name	Description
364	aurora-cmgr	Aurora CMGR
517	talk	like tenex link, but across machine - unfortunately, doesn't use link protocol (this is actually just a rendezvous port from which a tcp connection is established)
643	sanity	SANity
1142	edtools	User Discovery Service
1399	cadkey-licman	Cadkey License Manager
1988	tr-rsrb-p2	cisco RSRB Priority 2 port
2577	scipticslsrvr	Scriptics Lsrvr
3131	netbookmark	Net Book Mark
3673	mediavault-gui	Openview Media Vault GUI
3953	xmlink-connect	Eydeas XMLink Connect

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