Many consumer and professional routers (e.g., Ubiquiti UniFi, MikroTik, Asus) maintain DNS and connection logs. You might see:
DST=94.140.14.14 DPT=53 DOMAIN=tb-rg.adguard.net
This means your router sent a DNS query for that domain to AdGuard’s public DNS server. tb-rg adguard.net
Using command line tools, check if the domain resolves at all. Many consumer and professional routers (e
nslookup tb-rg.adguard.net
# or
dig tb-rg.adguard.net
If you get an answer (an IP address), note the IP. If you get NXDOMAIN, the domain does not exist – your logs may contain a typo. This means your router sent a DNS query
AdGuard is a multinational company known for its cross-platform ad-blocking and privacy protection software. Unlike browser extensions that only block ads within a specific browser, AdGuard operates at the system level or even the network level. Their flagship product, AdGuard DNS, is a public DNS service that filters out ads, trackers, malware domains, and adult content before they ever reach your device.