Browser-Based DNS Diagnostic and Lookup Tool

C5/10March 22, 2026
WhatA polished, client-side web tool that lets anyone perform DNS lookups across multiple resolvers simultaneously, showing filtering differences, propagation status, and categorization flags in a single view.
SignalA commenter was thrilled to discover Cloudflare's DNS-over-HTTPS API has open CORS headers enabling browser-based lookups, and immediately built a tool — suggesting strong latent demand for accessible DNS debugging without installing CLI tools.
Why NowDNS-over-HTTPS APIs with open CORS are now widely available from major providers, making it possible for the first time to build rich DNS diagnostic tools that run entirely in the browser with no backend.
MarketWeb developers, sysadmins, and security researchers — millions of potential users but monetization is thin; could be a freemium SaaS for teams at ~$10/mo. Competes with mxtoolbox and dnschecker but neither offers real-time multi-resolver comparison in-browser.
MoatWeak — easy to replicate. Would need to build community and integrations quickly.
Cloudflare flags archive.today as "C&C/Botnet"; no longer resolves via 1.1.1.2 View discussion ↗ · Article ↗ · 393 pts · March 22, 2026

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