Why AdGuard creates a class B access?

Hi Everyone,
AX1800 Flint, v4.6.8
I got some internet degradation couple days ago and while I was checking logs I found this several times:

GL-AX1800 AdGuardHome[31302]: 2025/01/30 16:02:30.035551 [info] go to http://172.30.55.1:3000

I have never created a new subnet... I just use 192.168.X.X...

What is that other subnet for? I couldn't find it to block it.....This time I have blocked remote access for WAN but what could have happened?
BTW PublicIP:3000 is also published unwanted.

If you visit from LAN side, you can access it. It does not mean the port is open the the Internet.

I don't have an idea of 172.30.55.1 though.

Seems to be the default IP of Hitron modems, see https://ussupport.hitrontech.com/portal/en/kb/articles/how-do-i-access-the-gui-on-the-d60

Maybe something is odd in your network topology?

Weird... look at screenshot....
The only subnet I have are 192.168.8.X family, 192.168.18.X for guest

If you ssh to the router, can you try this command:

ifconfig

In your windows, open a cmd window and use the following command

ipconfig/all

It seems Goodcloud service add that ip

I think mistery solved!
Thanks!

While I am not sure why. But glad that is is solved.