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Port 45825 (qdb2service)

IANA assigns port 45825 to qdb2service: Qpuncture Data Access Service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
qdb2service TCP Qpuncture Data Access Service Michael Yun -
qdb2service UDP Qpuncture Data Access Service Michael Yun -

Registry dates for this port: registered 2007-10-24.

Check what is listening on port 45825

Linux: is anything listening on TCP 45825?
sudo ss -tlnp 'sport = :45825'
Linux: UDP 45825
sudo ss -ulnp 'sport = :45825'
Linux / macOS: which process owns the port
sudo lsof -nP -i :45825
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':45825 '
Windows (Command Prompt)
netstat -ano | findstr :45825
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 45825 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 45825
From Windows
Test-NetConnection HOST -Port 45825
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 45825

Block port 45825 in the firewall

ufw
sudo ufw deny 45825/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 45825 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 45825 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 45825' -Direction Inbound -Protocol TCP -LocalPort 45825 -Action Block
ufw
sudo ufw deny 45825/udp
iptables
sudo iptables -A INPUT -p udp --dport 45825 -j DROP
nftables
sudo nft add rule inet filter input udp dport 45825 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 45825' -Direction Inbound -Protocol UDP -LocalPort 45825 -Action Block

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