CyberHunter
Local dataset, no network
// Other services

Port 2491: Conclave CPP

Port 2491 is assigned by IANA to conclave-cpp (Conclave CPP).

2491

How conclave-cpp works

Other services
client:2491conclave-cppresponse client:2491conclave-cppresponse

The client sends a request to port 2491 and the conclave-cpp 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 2491 dangerous?

We have no specific security note for port 2491. 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 2491

ServicePortTransportDescriptionReferenceUpdated
conclave-cpp 2491 TCP, UDP Conclave CPP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2491, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2491'      # process listening on 2491
sudo lsof -nP -i :2491

macOS

sudo lsof -nP -i :2491

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2491 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2491
netstat -ano | findstr :2491

From another machine

nmap -p 2491 -sV <host>
sudo nmap -sU -p 2491 <host>
nc -zv <host> 2491

Block it in the firewall

sudo ufw deny 2491/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2491" -Direction Inbound -LocalPort 2491 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2491 used for?

Port 2491 is assigned by IANA to conclave-cpp (Conclave CPP).

Is port 2491 TCP or UDP?

Port 2491 is registered for TCP and UDP.

Is it safe to open port 2491?

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 2491 is open?

On Linux run "ss -ltnup 'sport = :2491'", on macOS "lsof -nP -i :2491", and on Windows "netstat -ano | findstr :2491" to see the local process. From another machine, "nmap -p 2491 <host>" shows whether it is reachable.

05 Related
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