CyberHunter
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// Other services

Port 3639: Extensible Automation

Port 3639 is assigned by IANA to xap-ha (Extensible Automation).

3639

How xap-ha works

Other services
client:3639xap-haresponse client:3639xap-haresponse

The client sends a request to port 3639 and the xap-ha service answers.

Transport
TCP · 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 3639 dangerous?

We have no specific security note for port 3639. 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 3639

ServicePortTransportDescriptionReferenceUpdated
xap-ha 3639 TCP, UDP Extensible Automation - 2002-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 3639, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3639'      # process listening on 3639
sudo lsof -nP -i :3639

macOS

sudo lsof -nP -i :3639

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3639 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3639
netstat -ano | findstr :3639

From another machine

nmap -p 3639 -sV <host>
sudo nmap -sU -p 3639 <host>
nc -zv <host> 3639

Block it in the firewall

sudo ufw deny 3639/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3639" -Direction Inbound -LocalPort 3639 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3639 used for?

Port 3639 is assigned by IANA to xap-ha (Extensible Automation).

Is port 3639 TCP or UDP?

Port 3639 is registered for TCP and UDP.

Is it safe to open port 3639?

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 3639 is open?

On Linux run "ss -ltnup 'sport = :3639'", on macOS "lsof -nP -i :3639", and on Windows "netstat -ano | findstr :3639" to see the local process. From another machine, "nmap -p 3639 <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

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