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// Other services

Port 5913: Automatic Dependent Surveillance

Port 5913 is assigned by IANA to ads-c (Automatic Dependent Surveillance), aoc-acars (Airline operational communications applications using ACARS).

5913

How ads-c works

Other services
client:5913ads-cresponse client:5913ads-cresponse

The client sends a request to port 5913 and the ads-c service answers.

Transport
SCTP · TCP · UDP
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 5913 dangerous?

We have no specific security note for port 5913. 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 5913

ServicePortTransportDescriptionReferenceUpdated
ads-c 5913 SCTP Automatic Dependent Surveillance - 2011-05-25
aoc-acars 5913 TCP, UDP Airline operational communications applications using ACARS - 2022-08-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 5913, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5913'      # process listening on 5913
sudo lsof -nP -i :5913

macOS

sudo lsof -nP -i :5913

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5913 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5913
netstat -ano | findstr :5913

From another machine

nmap -p 5913 -sV <host>
sudo nmap -sU -p 5913 <host>
nc -zv <host> 5913

Block it in the firewall

sudo ufw deny 5913/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5913" -Direction Inbound -LocalPort 5913 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5913 used for?

Port 5913 is assigned by IANA to ads-c (Automatic Dependent Surveillance), aoc-acars (Airline operational communications applications using ACARS).

Is port 5913 TCP or UDP?

Port 5913 is registered for SCTP and TCP and UDP.

Is it safe to open port 5913?

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 5913 is open?

On Linux run "ss -ltnup 'sport = :5913'", on macOS "lsof -nP -i :5913", and on Windows "netstat -ano | findstr :5913" to see the local process. From another machine, "nmap -p 5913 <host>" shows whether it is reachable.

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