525 timeserver - System Port | Service Name:timed

525 is a System Port. Transport Protocol TCP UDP , 525 Service Name timed, Service Name Description: timeserver.

Port	Protocol	Service Name	Description	Source
525	TCP UDP	timed	timeserver	IANA
525	UDP		Timed, Timeserver,Official	wikipedia
525	TCP UDP	timed	timeserver	bekkoame

Port	Service Name	Description
583	philips-vc	Philips Video-Conferencing
724		Unassigned
1040	netarx	Netarx Netcare
1623	jaleosnd	jaleosnd
1630	oraclenet8cman	Oracle Net8 Cman
1995	perf-port	cisco perf port
2395	lan900-remote	LAN900 Remote IANA assigned this well-formed service name as a replacement for "lan900_remote".
2590	idotdist	idotdist
2701	sms-rcinfo	SMS RCINFO
2849	fxp	FXP

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