CyberHunter
Local dataset, no network
// Other services

Port 18186: Occupational Health SC

Port 18186 is assigned by IANA to ohsc (Occupational Health SC).

18186

How ohsc works

Other services
client:18186ohscresponse client:18186ohscresponse

The client sends a request to port 18186 and the ohsc 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 18186 dangerous?

We have no specific security note for port 18186. 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 18186

ServicePortTransportDescriptionReferenceUpdated
ohsc 18186 TCP, UDP Occupational Health SC - 2003-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 18186, and is it reachable?

Linux

sudo ss -ltnup 'sport = :18186'      # process listening on 18186
sudo lsof -nP -i :18186

macOS

sudo lsof -nP -i :18186

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 18186 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 18186
netstat -ano | findstr :18186

From another machine

nmap -p 18186 -sV <host>
sudo nmap -sU -p 18186 <host>
nc -zv <host> 18186

Block it in the firewall

sudo ufw deny 18186/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 18186" -Direction Inbound -LocalPort 18186 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 18186 used for?

Port 18186 is assigned by IANA to ohsc (Occupational Health SC).

Is port 18186 TCP or UDP?

Port 18186 is registered for TCP and UDP.

Is it safe to open port 18186?

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 18186 is open?

On Linux run "ss -ltnup 'sport = :18186'", on macOS "lsof -nP -i :18186", and on Windows "netstat -ano | findstr :18186" to see the local process. From another machine, "nmap -p 18186 <host>" shows whether it is reachable.

05 Related
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