545 appleqtcsrvr - System Port | Service Name:appleqtcsrvr

545 is a System Port. Transport Protocol TCP UDP , 545 Service Name appleqtcsrvr, Service Name Description: appleqtcsrvr.

Port	Protocol	Service Name	Description	Source
545	TCP UDP	appleqtcsrvr	appleqtcsrvr	IANA
545	TCP		OSIsoft PI (VMS), OSISoft PI Server Client Access,Unofficial	wikipedia
545	TCP UDP	appleqtcsrvr	appleqtcsrvr	bekkoame

Port	Service Name	Description
784		Unassigned
1255	de-cache-query	de-cache-query
1304	boomerang	Boomerang
1395	iclpv-wsm	PC Workstation Manager software
1566	corelvideo	CORELVIDEO
3228	dwmsgserver	DiamondWave MSG Server
3694		Unassigned
5387		Unassigned
6079		Unassigned
7357	swx	The Swiss Exchange

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