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Port 7040 (quest-disc)

IANA assigns port 7040 to quest-disc: Quest application level network service discovery.

Registered (user) port, 1024-49151 UDP

Port 7040 is normally used over UDP; the checker tests TCP only, so a "filtered" result does not mean the UDP service is down.

IANA assignment

Service nameProtoDescriptionAssigneeReference
quest-disc UDP Quest application level network service discovery Quest Software -

Registry dates for this port: registered 2012-04-09.

Check what is listening on port 7040

Linux: UDP 7040
sudo ss -ulnp 'sport = :7040'
Linux / macOS: which process owns the port
sudo lsof -nP -i :7040
Windows (Command Prompt)
netstat -ano | findstr :7040
Windows (PowerShell)
Get-NetUDPEndpoint -LocalPort 7040

Test it from outside

UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 7040

Block port 7040 in the firewall

ufw
sudo ufw deny 7040/udp
iptables
sudo iptables -A INPUT -p udp --dport 7040 -j DROP
nftables
sudo nft add rule inet filter input udp dport 7040 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 7040' -Direction Inbound -Protocol UDP -LocalPort 7040 -Action Block

Related ports

7030op-probe7031iposplanet7070arcp7071iwg1

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.