748 Russell Info Sci Calendar Manager - System Port

748 is a System Port. Transport Protocol TCP UDP , 748 Service Name ris-cm, Service Name Description: Russell Info Sci Calendar Manager.

Port	Protocol	Service Name	Description	Source
748	TCP UDP	ris-cm	Russell Info Sci Calendar Manager	IANA
748	TCP UDP		Mac OS X RPC-based services, Used by NetInfo, for example	Apple.com
748	TCP UDP	ris-cm	Russell Info Sci Calendar Manager	bekkoame

Port	Service Name	Description
1008		Unassigned
1905	sugp	Secure UP.Link Gateway Protocol
2088	ip-blf	IP Busy Lamp Field
2768	uacs	UACS
3445	monp	Media Object Network
3691	magaya-network	Magaya Network Port
3892	pcc-image-port	PCC-image-port
3950	namemunge	Name Munging
5531		Unassigned
5849		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