CyberHunter
Local dataset, no network
// Other services

Port 2881: NDSP

Port 2881 is assigned by IANA to ndsp (NDSP).

2881

How ndsp works

Other services
client:2881ndspresponse client:2881ndspresponse

The client sends a request to port 2881 and the ndsp service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 2881 dangerous?

We have no specific security note for port 2881. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 2881

ServicePortTransportDescriptionReferenceUpdated
ndsp 2881 TCP, UDP NDSP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2881, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2881'      # process listening on 2881
sudo lsof -nP -i :2881

macOS

sudo lsof -nP -i :2881

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2881 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2881
netstat -ano | findstr :2881

From another machine

nmap -p 2881 -sV <host>
sudo nmap -sU -p 2881 <host>
nc -zv <host> 2881

Block it in the firewall

sudo ufw deny 2881/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2881" -Direction Inbound -LocalPort 2881 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2881 used for?

Port 2881 is assigned by IANA to ndsp (NDSP).

Is port 2881 TCP or UDP?

Port 2881 is registered for TCP and UDP.

Is it safe to open port 2881?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 2881 is open?

On Linux run "ss -ltnup 'sport = :2881'", on macOS "lsof -nP -i :2881", and on Windows "netstat -ano | findstr :2881" to see the local process. From another machine, "nmap -p 2881 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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