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// Other services

Port 4936: Signal protocol port for autonomic networking

Port 4936 is assigned by IANA to an-signaling (Signal protocol port for autonomic networking).

4936

How an-signaling works

Other services
client:4936an-signalingresponse client:4936an-signalingresponse

The client sends a request to port 4936 and the an-signaling 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 4936 dangerous?

We have no specific security note for port 4936. 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 4936

ServicePortTransportDescriptionReferenceUpdated
an-signaling 4936 UDP Signal protocol port for autonomic networking - 2014-06-06
-4936-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 4936, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4936'      # process listening on 4936
sudo lsof -nP -i :4936

macOS

sudo lsof -nP -i :4936

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4936 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4936
netstat -ano | findstr :4936

From another machine

nmap -p 4936 -sV <host>
sudo nmap -sU -p 4936 <host>
nc -zv <host> 4936

Block it in the firewall

sudo ufw deny 4936/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4936" -Direction Inbound -LocalPort 4936 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 4936 used for?

Port 4936 is assigned by IANA to an-signaling (Signal protocol port for autonomic networking).

Is port 4936 TCP or UDP?

Port 4936 is registered for UDP.

Is it safe to open port 4936?

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 4936 is open?

On Linux run "ss -ltnup 'sport = :4936'", on macOS "lsof -nP -i :4936", and on Windows "netstat -ano | findstr :4936" to see the local process. From another machine, "nmap -p 4936 <host>" shows whether it is reachable.

05 Related
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