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// Other services

Port 2974: Signal

Port 2974 is assigned by IANA to signal (Signal).

2974

How signal works

Other services
client:2974signalresponse client:2974signalresponse

The client sends a request to port 2974 and the signal 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 2974 dangerous?

We have no specific security note for port 2974. 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 2974

ServicePortTransportDescriptionReferenceUpdated
signal 2974 TCP, UDP Signal - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2974, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2974'      # process listening on 2974
sudo lsof -nP -i :2974

macOS

sudo lsof -nP -i :2974

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2974 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2974
netstat -ano | findstr :2974

From another machine

nmap -p 2974 -sV <host>
sudo nmap -sU -p 2974 <host>
nc -zv <host> 2974

Block it in the firewall

sudo ufw deny 2974/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2974" -Direction Inbound -LocalPort 2974 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2974 used for?

Port 2974 is assigned by IANA to signal (Signal).

Is port 2974 TCP or UDP?

Port 2974 is registered for TCP and UDP.

Is it safe to open port 2974?

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 2974 is open?

On Linux run "ss -ltnup 'sport = :2974'", on macOS "lsof -nP -i :2974", and on Windows "netstat -ano | findstr :2974" to see the local process. From another machine, "nmap -p 2974 <host>" shows whether it is reachable.

05 Related
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