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Port 2490 (qip-qdhcp)

IANA assigns port 2490 to qip-qdhcp: qip_qdhcp.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
qip-qdhcp TCP qip_qdhcp Mike Morgan -
qip-qdhcp UDP qip_qdhcp Mike Morgan -

Check what is listening on port 2490

Linux: is anything listening on TCP 2490?
sudo ss -tlnp 'sport = :2490'
Linux: UDP 2490
sudo ss -ulnp 'sport = :2490'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2490
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2490 '
Windows (Command Prompt)
netstat -ano | findstr :2490
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2490 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2490
From Windows
Test-NetConnection HOST -Port 2490
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2490

Block port 2490 in the firewall

ufw
sudo ufw deny 2490/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2490 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2490 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2490' -Direction Inbound -Protocol TCP -LocalPort 2490 -Action Block
ufw
sudo ufw deny 2490/udp
iptables
sudo iptables -A INPUT -p udp --dport 2490 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2490 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2490' -Direction Inbound -Protocol UDP -LocalPort 2490 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.