528 Customer IXChange - System Port

528 is a System Port. Transport Protocol TCP UDP , 528 Service Name custix, Service Name Description: Customer IXChange.

Port	Protocol	Service Name	Description	Source
528	TCP UDP	custix	Customer IXChange	IANA
528	TCP UDP	custix	Customer IXChange	bekkoame

Port	Service Name	Description
82	xfer	XFER Utility
200	src	IBM System Resource Controller
567	banyan-rpc	banyan-rpc
3021	agriserver	AGRI Server
3589	isomair	isomair
4205	vrml-multi-use	VRML Multi User Systems
4462		Unassigned
4992		Unassigned
5293		Unassigned
6304		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