Why HAOS is on it's own 172.x.x.x subnet?

Installation Home Assistant OS
1
  1. I have a HAOS running and from my router, it was assigned 192.168.1.58
  2. Using the VSCode add-on, I dropped to the terminal and ran a ifconfig
  3. But only 127.0.0.1 and 172.30.33.0 showed up
  4. Why does it do this? Where is the 192.168.1.58?
  5. My problem is that, 192 subnet is able to resolve mqttbroker, but in HAOS, I have to provide it with a FQDN
2

Under the hood, Home Assistant OS is running on Docker, which is what is using the 172.x.x.x subnet.