Observed arrival · 2026-09-07

Domain Doctor, the outside-in hostname checkup

domaindoctor.fyi Observed source

Editorial interest 74/100 Selection signal · not a rating of the site

An open-source diagnostic tool that checks a public hostname’s DNS, TLS certificates, HTTPS behavior, redirects, and browser security headers.

Landing page captured for the 2026-09-07 issue.

Field notes

The page organizes hostname inspection around four visible layers: DNS resolution, TLS certificate coverage and validity, HTTPS reachability and redirects, and browser security headers. It offers example targets including github.com, example.com, and cloudflare.com, while limiting the stated scope to public hostnames on ports 80 and 443. Source code, an API, API documentation, privacy information, and feedback links are exposed from the homepage.

Observed signals

Read the marks

Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

◎NicheUnusually specific use

One card from the complete issue

A Record Press With a 0.4 mm Nozzle

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