CyberHunter
Local dataset, no network
// Other services

Port 2204: b2 License Server

Port 2204 is assigned by IANA to b2-license (b2 License Server).

2204

How b2-license works

Other services
client:2204b2-licenseresponse client:2204b2-licenseresponse

The client sends a request to port 2204 and the b2-license 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 2204 dangerous?

We have no specific security note for port 2204. 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 2204

ServicePortTransportDescriptionReferenceUpdated
b2-license 2204 TCP, UDP b2 License Server - 2006-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 2204, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2204'      # process listening on 2204
sudo lsof -nP -i :2204

macOS

sudo lsof -nP -i :2204

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2204 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2204
netstat -ano | findstr :2204

From another machine

nmap -p 2204 -sV <host>
sudo nmap -sU -p 2204 <host>
nc -zv <host> 2204

Block it in the firewall

sudo ufw deny 2204/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2204" -Direction Inbound -LocalPort 2204 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2204 used for?

Port 2204 is assigned by IANA to b2-license (b2 License Server).

Is port 2204 TCP or UDP?

Port 2204 is registered for TCP and UDP.

Is it safe to open port 2204?

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 2204 is open?

On Linux run "ss -ltnup 'sport = :2204'", on macOS "lsof -nP -i :2204", and on Windows "netstat -ano | findstr :2204" to see the local process. From another machine, "nmap -p 2204 <host>" shows whether it is reachable.

05 Related
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