481 Ph service - System Port

481 is a System Port. Transport Protocol TCP UDP , 481 Service Name ph, Service Name Description: Ph service.

Port	Protocol	Service Name	Description	Source
481	TCP UDP	ph	Ph service	IANA
481	TCP UDP	ph	Ph service	bekkoame

Port	Service Name	Description
1506	utcd	Universal Time daemon (utcd)
1985	hsrp	Hot Standby Router Protocol
2156	trp	Talari Reliable Protocol
2577	scipticslsrvr	Scriptics Lsrvr
2582	argis-ds	ARGIS DS
2755	expresspay	Express Pay
3893	cgi-starapi	CGI StarAPI Server
4593	ipt-anri-anri	IPT (ANRI-ANRI)
4728	capmux	CA Port Multiplexer
5822		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