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// Other services

Port 3183: COPS/TLS

Port 3183 is assigned by IANA to cops-tls (COPS/TLS).

3183

How cops-tls works

Other services
client:3183cops-tlsresponse client:3183cops-tlsresponse

The client sends a request to port 3183 and the cops-tls 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 3183 dangerous?

We have no specific security note for port 3183. 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 3183

ServicePortTransportDescriptionReferenceUpdated
cops-tls 3183 TCP, UDP COPS/TLS - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3183, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3183'      # process listening on 3183
sudo lsof -nP -i :3183

macOS

sudo lsof -nP -i :3183

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3183 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3183
netstat -ano | findstr :3183

From another machine

nmap -p 3183 -sV <host>
sudo nmap -sU -p 3183 <host>
nc -zv <host> 3183

Block it in the firewall

sudo ufw deny 3183/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3183" -Direction Inbound -LocalPort 3183 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3183 used for?

Port 3183 is assigned by IANA to cops-tls (COPS/TLS).

Is port 3183 TCP or UDP?

Port 3183 is registered for TCP and UDP.

Is it safe to open port 3183?

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 3183 is open?

On Linux run "ss -ltnup 'sport = :3183'", on macOS "lsof -nP -i :3183", and on Windows "netstat -ano | findstr :3183" to see the local process. From another machine, "nmap -p 3183 <host>" shows whether it is reachable.

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