Adguard.net ((exclusive)) - Tb-rg

Since this site relies on Microsoft's backend APIs, it occasionally goes down if Microsoft changes how their direct links are served. Community members often track these changes on technical forums like K-Meleon .

By measuring whether tb-rg.adguard.net resolves to a real public IP (which it never does natively) or returns a blocked/null response, the device can infer: “Ah, this network is using an ad-blocking DNS.” tb-rg adguard.net

So when you see tb-rg adguard.net in your logs, you are witnessing a connectivity probe . Since this site relies on Microsoft's backend APIs,

Because the domain is obscure and not a well-known tracker (like doubleclick.net ), it flies under the radar of most users—except those running a local DNS filter. the device can infer: “Ah