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// Other services

Port 9888: CYBORG Systems

Port 9888 is assigned by IANA to cyborg-systems (CYBORG Systems).

9888

How cyborg-systems works

Other services
client:9888cyborg-systemsresponse client:9888cyborg-systemsresponse

The client sends a request to port 9888 and the cyborg-systems 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 9888 dangerous?

We have no specific security note for port 9888. 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 9888

ServicePortTransportDescriptionReferenceUpdated
cyborg-systems 9888 TCP, UDP CYBORG Systems - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 9888, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9888'      # process listening on 9888
sudo lsof -nP -i :9888

macOS

sudo lsof -nP -i :9888

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9888 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9888
netstat -ano | findstr :9888

From another machine

nmap -p 9888 -sV <host>
sudo nmap -sU -p 9888 <host>
nc -zv <host> 9888

Block it in the firewall

sudo ufw deny 9888/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9888" -Direction Inbound -LocalPort 9888 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9888 used for?

Port 9888 is assigned by IANA to cyborg-systems (CYBORG Systems).

Is port 9888 TCP or UDP?

Port 9888 is registered for TCP and UDP.

Is it safe to open port 9888?

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 9888 is open?

On Linux run "ss -ltnup 'sport = :9888'", on macOS "lsof -nP -i :9888", and on Windows "netstat -ano | findstr :9888" to see the local process. From another machine, "nmap -p 9888 <host>" shows whether it is reachable.

05 Related
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