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The overwhelming majority of tb-rg requests originate from Android devices, specifically those running:
The tb-rg domain is hardcoded into system-level components of these Android distributions, often within:
Unlike standard Android’s connectivity check (which pings connectivitycheck.android.com or www.google.com), OEMs frequently replace these endpoints with their own—and sometimes add extra probes like tb-rg. tb-rg adguard.net
Go to AdGuard’s knowledge base (kb.adguard.com) and search for “dynamic subdomains” or “telemetry endpoints.” While they don’t always publish every subdomain, they do list their public IP ranges and standard DNS hosts.
As third-party cookies depreciate, tracking is shifting to first-party redirects (e.g., example.com redirecting through its own tracking endpoint). AdGuard has announced that TB-RG will evolve to include first-party redirect chains that: The overwhelming majority of tb-rg requests originate from
AdGuard’s solution: Even if the redirect is first-party, if it meets TB-RG heuristics (e.g., same domain serves as redirect >80% of the time), it will be blocked.
This is the clever part. The tb-rg subdomain is not a real, resolvable host under normal circumstances. AdGuard does not host a live service at tb-rg.adguard.net. So why would an Android device try to reach it? The tb-rg domain is hardcoded into system-level components
There are three plausible explanations:
When a domain is categorized as TB-RG, AdGuard DNS will: