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Life & fun · August 15, 2025

Ldns.com – fast DNS lookups from the URL bar

I built LDNS because I'm constantly curious about domain names - who owns them, which nameservers they use, how they're configured, and what their DNS records reveal. I wanted a fast, easy way to investigate domains right from my browser without juggling multiple tools. LDNS runs entirely client-side using Cloudflare's DNS over HTTPS. Just type a domain and instantly see: All DNS records with clickable filtering RDAP/WHOIS data with registrar info and expiration dates Email security configuration (SPF, DMARC, MTA-STS, BIMI) Export options (JSON, CSV, BIND zones, PDF reports) Try it at…

Ldns.com – fast DNS lookups from the URL bar launched on August 15, 2025 with 7 votes, #3,174 of 8,530 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 1 year on.

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What it does

Look up DNS records, RDAP/WHOIS, email authentication (SPF, DMARC, DKIM, BIMI), TLS certificates, security headers, ASN, and subdomains for any domain. Instant, free, no install.

DNS records, registration data, email authentication, TLS certificates, security headers, IP geolocation, and subdomains, for any domain on the internet. No accounts. No tracking. // try ldns.com/google.com , /cloudflare.com , or /github.com A, AAAA, MX, TXT, NS, SOA, CAA and CNAME over encrypted DoH. SPF, DMARC, DKIM, BIMI and MTA-STS, with provider detection. Free, public, rate-limited JSON endpoints powering the same lookups you see in the UI. No API key. No accounts. Heavy edge caching at Cloudflare so your lookups are fast. The LDNS extension for Chrome and Firefox runs the same lookups as this site, on whatever tab you're viewing, popup or pinned in the sidefrom ldns.com

In the maker’s words, at launch

I built LDNS because I'm constantly curious about domain names - who owns them, which nameservers they use, how they're configured, and what their DNS records reveal. I wanted a fast, easy way to investigate domains right from my browser without juggling multiple tools. LDNS runs entirely client-side using…

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