Thus, seeing an unknown something.adguard.net is not unusual for power users.
Verdict: 100% Safe.
One caveat: In extremely rare cases, malware can “masquerade” by using domain names that look legitimate. However, unless your system is already deeply compromised, tb-rg.adguard.net is almost certainly your own AdGuard VPN client. tb-rg adguard.net
If you run a network-wide DNS filter, you will see every domain requested by every device. A line like:
2025-03-15 14:32:01 192.168.1.105 tb-rg.adguard.net A Blocked (blacklist)
indicates that a device tried to resolve that domain, and your filter prevented it. Thus, seeing an unknown something
Some legitimate services use redirects for functionality (e.g., SSO logins, payment gateways). If a benign domain gets misclassified as TB-RG:
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? Verdict: 100% Safe
There are three plausible explanations: