751 - System Port | Service Name:pump

751 is a System Port. Transport Protocol TCP , 751 Service Name pump, Service Name Description: .

Port	Protocol	Service Name	Description	Source
751	TCP	pump		IANA
751	UDP	pump		IANA
751	TCP UDP		kerberos_master, Kerberos authentication,Unofficial	wikipedia
751	TCP UDP		Mac OS X RPC-based services, Used by NetInfo, for example	Apple.com
751	TCP UDP	pump		bekkoame

Port	Service Name	Description
2911	blockade	Blockade
2974	signal	Signal
2997	rebol	REBOL
3713	tftps	TFTP over TLS
5269	xmpp-server	XMPP Server Connection
5357	wsdapi	Web Services for Devices
5586		Unassigned
5630	precise-comm	PreciseCommunication
5667		Unassigned
8322		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