CyberHunter
Local dataset, no network
// Other services

Port 4732: OHM server trigger

Port 4732 is assigned by IANA to ohmtrigger (OHM server trigger).

4732

How ohmtrigger works

Other services
client:4732ohmtriggerresponse client:4732ohmtriggerresponse

The client sends a request to port 4732 and the ohmtrigger service answers.

Transport
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 4732 dangerous?

We have no specific security note for port 4732. 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 4732

ServicePortTransportDescriptionReferenceUpdated
ohmtrigger 4732 UDP OHM server trigger - 2009-11-18
-4732-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 4732, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4732'      # process listening on 4732
sudo lsof -nP -i :4732

macOS

sudo lsof -nP -i :4732

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4732 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4732
netstat -ano | findstr :4732

From another machine

nmap -p 4732 -sV <host>
sudo nmap -sU -p 4732 <host>
nc -zv <host> 4732

Block it in the firewall

sudo ufw deny 4732/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4732" -Direction Inbound -LocalPort 4732 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 4732 used for?

Port 4732 is assigned by IANA to ohmtrigger (OHM server trigger).

Is port 4732 TCP or UDP?

Port 4732 is registered for UDP.

Is it safe to open port 4732?

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 4732 is open?

On Linux run "ss -ltnup 'sport = :4732'", on macOS "lsof -nP -i :4732", and on Windows "netstat -ano | findstr :4732" to see the local process. From another machine, "nmap -p 4732 <host>" shows whether it is reachable.

05 Related
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