- 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.
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 servicesThe 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
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:
IANA registry entries for port 4936
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| an-signaling | 4936 | UDP | Signal protocol port for autonomic networking | - | 2014-06-06 |
| - | 4936 | - | Reserved | - | - |
// source: IANA service name and port number registry
Which program uses port 4936, and is it reachable?
Linux
sudo ss -ltnup 'sport = :4936' # process listening on 4936
sudo lsof -nP -i :4936macOS
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
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.
Other other services ports
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp