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
2041	interbase
3087	asoki-sma	Asoki SMA
3663	dtp	DIRECWAY Tunnel Protocol
4320	fdt-rcatp	FDT Remote Categorization Protocol
4328	jaxer-manager	Jaxer Manager Command Protocol
5341		Unassigned
5417	sns-agent	SNS Agent
5431	park-agent	PARK AGENT
5789		Unassigned
6419	svdrp	Simple VDR Protocol

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