Show HN: Open database tracking 77K public DNS servers every 10 minutes
timatping Thursday, December 18, 2025
Hey HN! We built DNS Directory (https://dnsdirectory.com), a free, searchable database of public DNS servers with live monitoring every 10 minutes.
We needed to find an up-to-date list of DNS servers used by carriers around the world for a proxy fingerprinting / web-scraping project but we were shocked to find that it didn’t exist so we built it ourselves in an internal Hackathon
We’re adding more features but so far we:
Test 77K+ servers every ~10 minutes Allow filtering by uptime, location, security features (ad blocking, malware protection, DNSSEC) Show info on IPv6 support, anycast, etc. Show all historical testing information
We have no plans to monetize the site and it will stay free so it can be used as a public resource.
I’d love to hear ways we can improve the site. It works but certain things like content filtering detection are rough around the edges, and we want to add test nodes in Asia + US for better coverage as right now we just test from Amsterdam.
If you want a DNS server that isn’t already on the website then you can add them via the form and if you’re a large org that has a bunch to add then you can email me at support@dnsdirectory.com and we’ll ingest them.
Cheers!