750 - System Port | Service Name:rfile

750 is a System Port. Transport Protocol TCP , 750 Service Name rfile, Service Name Description: .

Port	Protocol	Service Name	Description	Source
750	TCP	rfile		IANA
750	UDP	loadav		IANA
750	UDP	kerberos-iv	kerberos version iv	IANA
750	UDP		kerberos-iv, Kerberos version IV,Official	wikipedia
750	TCP UDP		Mac OS X RPC-based services, Used by NetInfo, for example	Apple.com
750	UDP	kerberos-iv	kerberos version iv	bekkoame
750	UDP	loadav		bekkoame
750	TCP	rfile		bekkoame

Port	Service Name	Description
722		Unassigned
753	rrh
1477	ms-sna-server	ms-sna-server
2840	l3-exprt	l3-exprt
3297	cytel-lm	Cytel License Manager
5307	sco-aip	SCO AIP
7221		Unassigned
8671		Unassigned
8733	ibus	iBus
8884		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