CyberHunter
Local dataset, no network
// Other services

Port 8900: JMB-CDS 1

Port 8900 is assigned by IANA to jmb-cds1 (JMB-CDS 1).

8900

How jmb-cds1 works

Other services
client:8900jmb-cds1response client:8900jmb-cds1response

The client sends a request to port 8900 and the jmb-cds1 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 8900 dangerous?

We have no specific security note for port 8900. 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 8900

ServicePortTransportDescriptionReferenceUpdated
jmb-cds1 8900 TCP, UDP JMB-CDS 1 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 8900, and is it reachable?

Linux

sudo ss -ltnup 'sport = :8900'      # process listening on 8900
sudo lsof -nP -i :8900

macOS

sudo lsof -nP -i :8900

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8900 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 8900
netstat -ano | findstr :8900

From another machine

nmap -p 8900 -sV <host>
sudo nmap -sU -p 8900 <host>
nc -zv <host> 8900

Block it in the firewall

sudo ufw deny 8900/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 8900" -Direction Inbound -LocalPort 8900 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 8900 used for?

Port 8900 is assigned by IANA to jmb-cds1 (JMB-CDS 1).

Is port 8900 TCP or UDP?

Port 8900 is registered for TCP and UDP.

Is it safe to open port 8900?

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 8900 is open?

On Linux run "ss -ltnup 'sport = :8900'", on macOS "lsof -nP -i :8900", and on Windows "netstat -ano | findstr :8900" to see the local process. From another machine, "nmap -p 8900 <host>" shows whether it is reachable.

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