DNS lookups that actually tell you what's going on.
Query every record type from every major resolver, watch propagation across 16 cities, and trace the DNSSEC chain — in one place, in under a second.
Six tools. One window. No dark patterns.
Built by SREs who got tired of switching tabs to debug a single misconfigured MX record.
Every record type, all at once
A, AAAA, CNAME, MX, TXT, NS, SOA, CAA, PTR, SRV, DS, DNSKEY — fetched in parallel, displayed by section.
Side-by-side resolver compare
See exactly what Cloudflare, Google, Quad9, OpenDNS and your authoritative servers each return — diffs highlighted.
Live global propagation
Watch DNS rollout from 16 probe cities on six continents. Tap any node for raw response + RTT.
DNSSEC chain visualizer
Walks the trust chain from root to leaf. Highlights broken signatures, missing DS records and KSK rollovers.
Mail deliverability check
Validates SPF, DKIM, DMARC, BIMI, MTA-STS and reverse DNS in one pass. Plain-English fix instructions.
Free public API
JSON, JSONP, and DoH endpoints. No auth, no rate-limit pages, no tracking. Use it in your monitor.
What you'll see for github.com
Resolver agreement
5/5 matchPlain-English guides to every record type.
Search-indexed, regularly updated, written by humans who run nameservers.
Address (IPv4)
Points a hostname to an IPv4 address. The most common record on the internet.
Address (IPv6)
The IPv6 equivalent of an A record. 128-bit addresses.
Canonical Name
Alias one hostname to another. Cannot coexist with most other records.
Mail Exchange
Directs email delivery to mail servers, ordered by priority.
Text
Arbitrary text. Used for SPF, DKIM, DMARC and domain verification.
Name Server
Delegates a zone to the authoritative DNS servers for it.
Start of Authority
Administrative info about the zone — primary NS, contact, serial, timers.
Certificate Authority
Restricts which CAs can issue SSL certificates for the domain.
Same engine, available over HTTPS and DoH.
Drop our API into your uptime monitor, deploy pipeline, or staging healthcheck. 100 requests/sec free; no card needed.