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// Other services

Port 18185: OPSEC OMI

Port 18185 is assigned by IANA to opsec-omi (OPSEC OMI).

18185

How opsec-omi works

Other services
client:18185opsec-omiresponse client:18185opsec-omiresponse

The client sends a request to port 18185 and the opsec-omi 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 18185 dangerous?

We have no specific security note for port 18185. 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 18185

ServicePortTransportDescriptionReferenceUpdated
opsec-omi 18185 TCP, UDP OPSEC OMI - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 18185, and is it reachable?

Linux

sudo ss -ltnup 'sport = :18185'      # process listening on 18185
sudo lsof -nP -i :18185

macOS

sudo lsof -nP -i :18185

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 18185 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 18185
netstat -ano | findstr :18185

From another machine

nmap -p 18185 -sV <host>
sudo nmap -sU -p 18185 <host>
nc -zv <host> 18185

Block it in the firewall

sudo ufw deny 18185/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 18185" -Direction Inbound -LocalPort 18185 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 18185 used for?

Port 18185 is assigned by IANA to opsec-omi (OPSEC OMI).

Is port 18185 TCP or UDP?

Port 18185 is registered for TCP and UDP.

Is it safe to open port 18185?

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 18185 is open?

On Linux run "ss -ltnup 'sport = :18185'", on macOS "lsof -nP -i :18185", and on Windows "netstat -ano | findstr :18185" to see the local process. From another machine, "nmap -p 18185 <host>" shows whether it is reachable.

05 Related
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