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// Other services

Port 8733: iBus

Port 8733 is assigned by IANA to ibus (iBus).

8733

How ibus works

Other services
client:8733ibusresponse client:8733ibusresponse

The client sends a request to port 8733 and the ibus 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 8733 dangerous?

We have no specific security note for port 8733. 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 8733

ServicePortTransportDescriptionReferenceUpdated
ibus 8733 TCP, UDP iBus - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 8733, and is it reachable?

Linux

sudo ss -ltnup 'sport = :8733'      # process listening on 8733
sudo lsof -nP -i :8733

macOS

sudo lsof -nP -i :8733

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8733 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 8733
netstat -ano | findstr :8733

From another machine

nmap -p 8733 -sV <host>
sudo nmap -sU -p 8733 <host>
nc -zv <host> 8733

Block it in the firewall

sudo ufw deny 8733/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 8733" -Direction Inbound -LocalPort 8733 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 8733 used for?

Port 8733 is assigned by IANA to ibus (iBus).

Is port 8733 TCP or UDP?

Port 8733 is registered for TCP and UDP.

Is it safe to open port 8733?

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 8733 is open?

On Linux run "ss -ltnup 'sport = :8733'", on macOS "lsof -nP -i :8733", and on Windows "netstat -ano | findstr :8733" to see the local process. From another machine, "nmap -p 8733 <host>" shows whether it is reachable.

05 Related
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