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// Other services

Port 2676: SIMSLink

Port 2676 is assigned by IANA to simslink (SIMSLink).

2676

How simslink works

Other services
client:2676simslinkresponse client:2676simslinkresponse

The client sends a request to port 2676 and the simslink 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 2676 dangerous?

We have no specific security note for port 2676. 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 2676

ServicePortTransportDescriptionReferenceUpdated
simslink 2676 TCP, UDP SIMSLink - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2676, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2676'      # process listening on 2676
sudo lsof -nP -i :2676

macOS

sudo lsof -nP -i :2676

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2676 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2676
netstat -ano | findstr :2676

From another machine

nmap -p 2676 -sV <host>
sudo nmap -sU -p 2676 <host>
nc -zv <host> 2676

Block it in the firewall

sudo ufw deny 2676/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2676" -Direction Inbound -LocalPort 2676 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2676 used for?

Port 2676 is assigned by IANA to simslink (SIMSLink).

Is port 2676 TCP or UDP?

Port 2676 is registered for TCP and UDP.

Is it safe to open port 2676?

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 2676 is open?

On Linux run "ss -ltnup 'sport = :2676'", on macOS "lsof -nP -i :2676", and on Windows "netstat -ano | findstr :2676" to see the local process. From another machine, "nmap -p 2676 <host>" shows whether it is reachable.

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