DoH is what makes the live .com check on this site possible without a backend. The browser asks Cloudflare's public resolver at 1.1.1.1 over HTTPS for the NS record of name.com, and reads the response. No server is involved on our side. Standard DNS over UDP cannot be called from a browser due to security policies, but DoH passes through the same fetch API used for any other request.
Color glossary
DoH (DNS over HTTPS)
A protocol that performs DNS lookups over an HTTPS connection rather than plain UDP.
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Portmanteau
A new word made by combining parts of two existing words.
NXDOMAIN
A DNS response code that indicates a queried domain name does not exist in the zone.
Premium Domain
A domain priced above the standard registration fee, typically because the registry or registrar has reserved it.
Trademark Class
A category in the Nice Classification system used to scope trademark registrations.
Common-Law Trademark
Trademark rights that arise from actual use in commerce, without federal registration.
TLD
Top-Level Domain. The final segment of a domain name, like .com, .io, or .ai.