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Port 8019 (qbdb)

IANA assigns port 8019 to qbdb: QB DB Dynamic Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
qbdb TCP QB DB Dynamic Port Sridhar Krishnamurth -
qbdb UDP QB DB Dynamic Port Sridhar Krishnamurth -

Registry dates for this port: registered 2008-02-15.

Check what is listening on port 8019

Linux: is anything listening on TCP 8019?
sudo ss -tlnp 'sport = :8019'
Linux: UDP 8019
sudo ss -ulnp 'sport = :8019'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8019
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8019 '
Windows (Command Prompt)
netstat -ano | findstr :8019
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8019 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8019
From Windows
Test-NetConnection HOST -Port 8019
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 8019

Block port 8019 in the firewall

ufw
sudo ufw deny 8019/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8019 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8019 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8019' -Direction Inbound -Protocol TCP -LocalPort 8019 -Action Block
ufw
sudo ufw deny 8019/udp
iptables
sudo iptables -A INPUT -p udp --dport 8019 -j DROP
nftables
sudo nft add rule inet filter input udp dport 8019 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 8019' -Direction Inbound -Protocol UDP -LocalPort 8019 -Action Block

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