CyberHunter
Local dataset, no network
// Other services

Port 2490: qip_qdhcp

Port 2490 is assigned by IANA to qip-qdhcp (qip_qdhcp).

2490

How qip-qdhcp works

Other services
client:2490qip-qdhcpresponse client:2490qip-qdhcpresponse

The client sends a request to port 2490 and the qip-qdhcp 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 2490 dangerous?

We have no specific security note for port 2490. 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 2490

ServicePortTransportDescriptionReferenceUpdated
qip-qdhcp 2490 TCP, UDP qip_qdhcp - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2490, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2490'      # process listening on 2490
sudo lsof -nP -i :2490

macOS

sudo lsof -nP -i :2490

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2490 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2490
netstat -ano | findstr :2490

From another machine

nmap -p 2490 -sV <host>
sudo nmap -sU -p 2490 <host>
nc -zv <host> 2490

Block it in the firewall

sudo ufw deny 2490/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2490" -Direction Inbound -LocalPort 2490 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2490 used for?

Port 2490 is assigned by IANA to qip-qdhcp (qip_qdhcp).

Is port 2490 TCP or UDP?

Port 2490 is registered for TCP and UDP.

Is it safe to open port 2490?

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 2490 is open?

On Linux run "ss -ltnup 'sport = :2490'", on macOS "lsof -nP -i :2490", and on Windows "netstat -ano | findstr :2490" to see the local process. From another machine, "nmap -p 2490 <host>" shows whether it is reachable.

05 Related
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