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// Databases & caches

Port 8019: QB DB Dynamic Port

Port 8019 is assigned by IANA to qbdb (QB DB Dynamic Port).

8019

How qbdb works

Databases & caches
app:8019qbdb app:8019qbdb

The application sends a SQL query to the qbdb server on port 8019, which returns rows from its tables.

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
Databases & caches
01 Security

Is port 8019 dangerous?

We have no specific security note for port 8019. Its risk depends on the program actually listening on it. General advice for databases & caches services:

  • Bind the service to localhost or a private network, never to a public address.
  • Enable authentication, use per-application accounts and require TLS.
  • Watch for exposed Docker ports: publish them on 127.0.0.1 only.
02 Registry

IANA registry entries for port 8019

ServicePortTransportDescriptionReferenceUpdated
qbdb 8019 TCP, UDP QB DB Dynamic Port - 2008-02-15

// source: IANA service name and port number registry

03 Check it

Which program uses port 8019, and is it reachable?

Linux

sudo ss -ltnup 'sport = :8019'      # process listening on 8019
sudo lsof -nP -i :8019

macOS

sudo lsof -nP -i :8019

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8019 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 8019
netstat -ano | findstr :8019

From another machine

nmap -p 8019 -sV <host>
sudo nmap -sU -p 8019 <host>
nc -zv <host> 8019

Block it in the firewall

sudo ufw deny 8019/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 8019" -Direction Inbound -LocalPort 8019 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 8019 used for?

Port 8019 is assigned by IANA to qbdb (QB DB Dynamic Port).

Is port 8019 TCP or UDP?

Port 8019 is registered for TCP and UDP.

Is it safe to open port 8019?

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. Bind the service to localhost or a private network, never to a public address.

How do I check if port 8019 is open?

On Linux run "ss -ltnup 'sport = :8019'", on macOS "lsof -nP -i :8019", and on Windows "netstat -ano | findstr :8019" to see the local process. From another machine, "nmap -p 8019 <host>" shows whether it is reachable.

05 Related
:3306 MySQL / MariaDB tcp · udp · high risk :1433 Microsoft SQL Server tcp · udp · high risk :5432 PostgreSQL tcp · udp · high risk :6379 Redis tcp · critical risk :27017 MongoDB tcp · critical risk :9200 Elasticsearch tcp · udp · critical risk :1521 Oracle Database tcp · udp · high risk :11211 Memcached tcp · udp · high risk

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