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// Other services

Port 5912: Aeronautical Information Service/Meteorological applications using ACARS

Port 5912 is assigned by IANA to ais-met (Aeronautical Information Service/Meteorological applications using ACARS), fis (Flight Information Services).

5912

How ais-met works

Other services
client:5912ais-metresponse client:5912ais-metresponse

The client sends a request to port 5912 and the ais-met service answers.

Transport
TCP · UDP · SCTP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 5912 dangerous?

We have no specific security note for port 5912. 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 5912

ServicePortTransportDescriptionReferenceUpdated
ais-met 5912 TCP, UDP Aeronautical Information Service/Meteorological applications using ACARS - 2022-08-08
fis 5912 SCTP Flight Information Services - 2011-05-25

// source: IANA service name and port number registry

03 Check it

Which program uses port 5912, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5912'      # process listening on 5912
sudo lsof -nP -i :5912

macOS

sudo lsof -nP -i :5912

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5912 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5912
netstat -ano | findstr :5912

From another machine

nmap -p 5912 -sV <host>
sudo nmap -sU -p 5912 <host>
nc -zv <host> 5912

Block it in the firewall

sudo ufw deny 5912/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5912" -Direction Inbound -LocalPort 5912 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5912 used for?

Port 5912 is assigned by IANA to ais-met (Aeronautical Information Service/Meteorological applications using ACARS), fis (Flight Information Services).

Is port 5912 TCP or UDP?

Port 5912 is registered for TCP and UDP and SCTP.

Is it safe to open port 5912?

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 5912 is open?

On Linux run "ss -ltnup 'sport = :5912'", on macOS "lsof -nP -i :5912", and on Windows "netstat -ano | findstr :5912" to see the local process. From another machine, "nmap -p 5912 <host>" shows whether it is reachable.

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