DNS Security Services Checker

Free online tool that lets you check if a host (domain or subdomain) is blocked by public DNS Security Services (aka Threat-blocking DNS Services or DNS Filtering Services), e.g. Quad9, Comodo Secure DNS, Strongarm, Norton ConnectSafe, SafeDNS, Yandex.DNS, etc. Useful to check if your website (or any other website) is blocked by popular DNS security services. You must NOT use the results of this web tool to compare DNS services.