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// Other services

Port 3624: Distributed Upgrade Port

Port 3624 is assigned by IANA to dist-upgrade (Distributed Upgrade Port).

3624

How dist-upgrade works

Other services
client:3624dist-upgraderesponse client:3624dist-upgraderesponse

The client sends a request to port 3624 and the dist-upgrade 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 3624 dangerous?

We have no specific security note for port 3624. 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 3624

ServicePortTransportDescriptionReferenceUpdated
dist-upgrade 3624 TCP, UDP Distributed Upgrade Port - 2002-10

// source: IANA service name and port number registry

03 Check it

Which program uses port 3624, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3624'      # process listening on 3624
sudo lsof -nP -i :3624

macOS

sudo lsof -nP -i :3624

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3624 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3624
netstat -ano | findstr :3624

From another machine

nmap -p 3624 -sV <host>
sudo nmap -sU -p 3624 <host>
nc -zv <host> 3624

Block it in the firewall

sudo ufw deny 3624/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3624" -Direction Inbound -LocalPort 3624 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3624 used for?

Port 3624 is assigned by IANA to dist-upgrade (Distributed Upgrade Port).

Is port 3624 TCP or UDP?

Port 3624 is registered for TCP and UDP.

Is it safe to open port 3624?

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 3624 is open?

On Linux run "ss -ltnup 'sport = :3624'", on macOS "lsof -nP -i :3624", and on Windows "netstat -ano | findstr :3624" to see the local process. From another machine, "nmap -p 3624 <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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