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// Other services

Port 2683: NCDLoadBalance

Port 2683 is assigned by IANA to ncdloadbalance (NCDLoadBalance).

2683

How ncdloadbalance works

Other services
client:2683ncdloadbalanceresponse client:2683ncdloadbalanceresponse

The client sends a request to port 2683 and the ncdloadbalance 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 2683 dangerous?

We have no specific security note for port 2683. 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 2683

ServicePortTransportDescriptionReferenceUpdated
ncdloadbalance 2683 TCP, UDP NCDLoadBalance - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2683, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2683'      # process listening on 2683
sudo lsof -nP -i :2683

macOS

sudo lsof -nP -i :2683

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2683 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2683
netstat -ano | findstr :2683

From another machine

nmap -p 2683 -sV <host>
sudo nmap -sU -p 2683 <host>
nc -zv <host> 2683

Block it in the firewall

sudo ufw deny 2683/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2683" -Direction Inbound -LocalPort 2683 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2683 used for?

Port 2683 is assigned by IANA to ncdloadbalance (NCDLoadBalance).

Is port 2683 TCP or UDP?

Port 2683 is registered for TCP and UDP.

Is it safe to open port 2683?

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 2683 is open?

On Linux run "ss -ltnup 'sport = :2683'", on macOS "lsof -nP -i :2683", and on Windows "netstat -ano | findstr :2683" to see the local process. From another machine, "nmap -p 2683 <host>" shows whether it is reachable.

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