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
844		Unassigned
880		Unassigned
1666	netview-aix-6	netview-aix-6
1724	csbphonemaster	csbphonemaster
2463	lsi-raid-mgmt	LSI RAID Management
2659	sns-query	SNS Query
3297	cytel-lm	Cytel License Manager
3547	symantec-sim	Symantec SIM
4304	owserver	One-Wire Filesystem Server
4603	menandmice-upg	Men & Mice Upgrade Agent

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