2881 NDSP - User Port | Service Name:ndsp

2881 is a User Port. Transport Protocol TCP UDP , 2881 Service Name ndsp, Service Name Description: NDSP.

Port	Protocol	Service Name	Description	Source
2881	TCP UDP	ndsp	NDSP	IANA
2881	TCP UDP	ndsp	NDSP	bekkoame

Port	Service Name	Description
194	irc	Internet Relay Chat Protocol
208	at-8	AppleTalk Unused
754	tell	send
929		Unassigned
2722	proactivesrvr	Proactive Server
3078	orbix-cfg-ssl	Orbix 2000 Locator SSL
3339	anet-l	OMF data l
3644	ssowatch	ssowatch
3752	vipremoteagent	Vigil-IP RemoteAgent
4128	nufw	NuFW decision delegation protocol

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