CyberHunter
Local dataset, no network
// Other services

Port 5904: Air-Ground SWIM

Port 5904 is assigned by IANA to ag-swim (Air-Ground SWIM).

5904

How ag-swim works

Other services
client:5904ag-swimresponse client:5904ag-swimresponse

The client sends a request to port 5904 and the ag-swim service answers.

Transport
TCP · UDP · SCTP
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 5904 dangerous?

We have no specific security note for port 5904. 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 5904

ServicePortTransportDescriptionReferenceUpdated
ag-swim 5904 TCP, UDP, SCTP Air-Ground SWIM - 2022-06-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 5904, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5904'      # process listening on 5904
sudo lsof -nP -i :5904

macOS

sudo lsof -nP -i :5904

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5904 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5904
netstat -ano | findstr :5904

From another machine

nmap -p 5904 -sV <host>
sudo nmap -sU -p 5904 <host>
nc -zv <host> 5904

Block it in the firewall

sudo ufw deny 5904/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5904" -Direction Inbound -LocalPort 5904 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5904 used for?

Port 5904 is assigned by IANA to ag-swim (Air-Ground SWIM).

Is port 5904 TCP or UDP?

Port 5904 is registered for TCP and UDP and SCTP.

Is it safe to open port 5904?

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 5904 is open?

On Linux run "ss -ltnup 'sport = :5904'", on macOS "lsof -nP -i :5904", and on Windows "netstat -ano | findstr :5904" to see the local process. From another machine, "nmap -p 5904 <host>" shows whether it is reachable.

05 Related
: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

Latest vulnerability news

All news