CyberHunter
Local dataset, no network
// Other services

Port 18183: OPSEC SAM

Port 18183 is assigned by IANA to opsec-sam (OPSEC SAM).

18183

How opsec-sam works

Other services
client:18183opsec-samresponse client:18183opsec-samresponse

The client sends a request to port 18183 and the opsec-sam 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 18183 dangerous?

We have no specific security note for port 18183. 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 18183

ServicePortTransportDescriptionReferenceUpdated
opsec-sam 18183 TCP, UDP OPSEC SAM - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 18183, and is it reachable?

Linux

sudo ss -ltnup 'sport = :18183'      # process listening on 18183
sudo lsof -nP -i :18183

macOS

sudo lsof -nP -i :18183

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 18183 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 18183
netstat -ano | findstr :18183

From another machine

nmap -p 18183 -sV <host>
sudo nmap -sU -p 18183 <host>
nc -zv <host> 18183

Block it in the firewall

sudo ufw deny 18183/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 18183" -Direction Inbound -LocalPort 18183 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 18183 used for?

Port 18183 is assigned by IANA to opsec-sam (OPSEC SAM).

Is port 18183 TCP or UDP?

Port 18183 is registered for TCP and UDP.

Is it safe to open port 18183?

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 18183 is open?

On Linux run "ss -ltnup 'sport = :18183'", on macOS "lsof -nP -i :18183", and on Windows "netstat -ano | findstr :18183" to see the local process. From another machine, "nmap -p 18183 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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