581 Bundle Discovery Protocol - System Port

581 is a System Port. Transport Protocol TCP UDP , 581 Service Name bdp, Service Name Description: Bundle Discovery Protocol.

Port	Protocol	Service Name	Description	Source
581	TCP UDP	bdp	Bundle Discovery Protocol	IANA
581	TCP UDP	bdp	Bundle Discovery Protocol	bekkoame

Port	Service Name	Description
938		Unassigned
2105	minipay	MiniPay
2115	kdm	Key Distribution Manager
2953	ovalarmsrv	OVALARMSRV
2993	veritas-vis1	VERITAS VIS1
3219	wms-messenger	WMS Messenger
5690		Unassigned
5864		Unassigned
6468		Unassigned
7659		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