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// Other services

Port 8981: Network of Devices Client

Port 8981 is assigned by IANA to nod-client (Network of Devices Client).

8981

How nod-client works

Other services
client:8981nod-clientresponse client:8981nod-clientresponse

The client sends a request to port 8981 and the nod-client service answers.

Transport
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 8981 dangerous?

We have no specific security note for port 8981. 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 8981

ServicePortTransportDescriptionReferenceUpdated
nod-client 8981 UDP Network of Devices Client - 2015-02-22
-8981-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 8981, and is it reachable?

Linux

sudo ss -ltnup 'sport = :8981'      # process listening on 8981
sudo lsof -nP -i :8981

macOS

sudo lsof -nP -i :8981

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8981 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 8981
netstat -ano | findstr :8981

From another machine

nmap -p 8981 -sV <host>
sudo nmap -sU -p 8981 <host>
nc -zv <host> 8981

Block it in the firewall

sudo ufw deny 8981/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 8981" -Direction Inbound -LocalPort 8981 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 8981 used for?

Port 8981 is assigned by IANA to nod-client (Network of Devices Client).

Is port 8981 TCP or UDP?

Port 8981 is registered for UDP.

Is it safe to open port 8981?

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 8981 is open?

On Linux run "ss -ltnup 'sport = :8981'", on macOS "lsof -nP -i :8981", and on Windows "netstat -ano | findstr :8981" to see the local process. From another machine, "nmap -p 8981 <host>" shows whether it is reachable.

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