Is Harbor actually blocking?

Your browser tries to reach known ad, malware, and adult domains. If DNS blocks them, they fail. See exactly what is and is not getting through.

This tool tests whether your DNS is actually blocking ad networks, malware sources, and adult content. Compatible with AdGuard Home, Pi-hole, NextDNS, Cloudflare, and Harbor Privacy. No data leaves your browser.

How it works: your browser tries to reach each domain via a 1x1 image request. If DNS blocks it, the request fails -- that is a pass. These domains come from the Hagezi Normal, Threat Intelligence Feed, and NSFW blocklists, the same ones active in AdGuard Home on your Harbor account. Results are never sent anywhere.