Port 558 SDNSKMP - System Port | Service Name:sdnskmp

Port 558 is a System Port. Transport Protocol TCP UDP , Port 558 Service Name sdnskmp, Service Name Description: SDNSKMP.

Port	Protocol	Service Name	Description	Source
558	TCP UDP	sdnskmp	SDNSKMP	IANA
558	TCP UDP	sdnskmp	SDNSKMP	bekkoame

Port	Service Name	Description
108	snagas	SNA Gateway Access Server
358	shrinkwrap	Shrinkwrap
360	scoi2odialog	scoi2odialog
1005		Unassigned
1592	commonspace	commonspace
1922	tapestry	Tapestry
1999	tcp-id-port	cisco identification port
2517	call-sig-trans	H.323 Annex E Call Control Signalling Transport
4129	nuauth	NuFW authentication protocol
4440		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