Live Network Flow & Embedded DNS Resolution Simulator

Embedded DNS: 127.0.0.11

How to test: Select a Source container, type a Target (e.g. db:5432), and click "Send Request" or run docker exec api ping db in the CLI!

From:

To:

Presets:

Source Container

IP: 172.17.0.2

Packet Origin (Sender)

Default Bridge Network

DNS Server: 127.0.0.11

⚠ Default Bridge (No DNS by name)

db:5432

Resolved: Pending Request...

Target Socket (TCP)

How Docker Container Networking Works:

Default Bridge (172.17.0.0/16): Created automatically by Docker. Containers can reach each other only by hardcoded IP (no DNS by container name).
User-Defined Bridge (e.g. app-net): Created with docker network create app-net. Docker enables its embedded DNS server (127.0.0.11) so containers discover each other automatically by name (e.g. http://db:5432).
Testing in CLI: Use docker exec <container> ping <target> to ping inside a container, or test here in the visualizer!

Docker Terminalv27.1

Quick:

$docker version8:41:44 PM

Client: Docker Engine - Community v27.1.1
Server: Docker Engine - Simulated In-Browser Runtime (Safe Sandbox)
Storage Driver: overlay2 (Virtual Layers)
Status: Ready • Zero Docker Desktop Required