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// Other services

Port 2120: Quick Eagle Networks CP

Port 2120 is assigned by IANA to qencp (Quick Eagle Networks CP).

2120

How qencp works

Other services
client:2120qencpresponse client:2120qencpresponse

The client sends a request to port 2120 and the qencp 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 2120 dangerous?

We have no specific security note for port 2120. 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 2120

ServicePortTransportDescriptionReferenceUpdated
qencp 2120 TCP, UDP Quick Eagle Networks CP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2120, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2120'      # process listening on 2120
sudo lsof -nP -i :2120

macOS

sudo lsof -nP -i :2120

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2120 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2120
netstat -ano | findstr :2120

From another machine

nmap -p 2120 -sV <host>
sudo nmap -sU -p 2120 <host>
nc -zv <host> 2120

Block it in the firewall

sudo ufw deny 2120/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2120" -Direction Inbound -LocalPort 2120 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2120 used for?

Port 2120 is assigned by IANA to qencp (Quick Eagle Networks CP).

Is port 2120 TCP or UDP?

Port 2120 is registered for TCP and UDP.

Is it safe to open port 2120?

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 2120 is open?

On Linux run "ss -ltnup 'sport = :2120'", on macOS "lsof -nP -i :2120", and on Windows "netstat -ano | findstr :2120" to see the local process. From another machine, "nmap -p 2120 <host>" shows whether it is reachable.

05 Related
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