CyberHunter
Local dataset, no network
// Other services

Port 2823: CQG Net/LAN

Port 2823 is assigned by IANA to cqg-netlan (CQG Net/LAN).

2823

How cqg-netlan works

Other services
client:2823cqg-netlanresponse client:2823cqg-netlanresponse

The client sends a request to port 2823 and the cqg-netlan 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 2823 dangerous?

We have no specific security note for port 2823. 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 2823

ServicePortTransportDescriptionReferenceUpdated
cqg-netlan 2823 TCP, UDP CQG Net/LAN - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2823, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2823'      # process listening on 2823
sudo lsof -nP -i :2823

macOS

sudo lsof -nP -i :2823

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2823 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2823
netstat -ano | findstr :2823

From another machine

nmap -p 2823 -sV <host>
sudo nmap -sU -p 2823 <host>
nc -zv <host> 2823

Block it in the firewall

sudo ufw deny 2823/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2823" -Direction Inbound -LocalPort 2823 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2823 used for?

Port 2823 is assigned by IANA to cqg-netlan (CQG Net/LAN).

Is port 2823 TCP or UDP?

Port 2823 is registered for TCP and UDP.

Is it safe to open port 2823?

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 2823 is open?

On Linux run "ss -ltnup 'sport = :2823'", on macOS "lsof -nP -i :2823", and on Windows "netstat -ano | findstr :2823" to see the local process. From another machine, "nmap -p 2823 <host>" shows whether it is reachable.

05 Related
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