"New Tool: DNS Propagation & Record Inspector"

2026-03-01 [dns devtools networking api]

Checking DNS propagation used to mean tabbing between five different websites and squinting at tables. Not anymore.

The DNS Propagation & Record Inspector is now live at /dns-check. It queries Google (8.8.8.8), Cloudflare (1.1.1.1), and Quad9 (9.9.9.9) simultaneously via DNS-over-HTTPS and shows you exactly where your records stand — in one shot.

What it does

7 record types: A, AAAA, MX, TXT, CNAME, NS, SOA
3 public resolvers queried in parallel
Propagation badge: "All Resolvers Agree ✓", "Partial", or "Not Propagated"
Mismatch highlighting: rows that disagree with the majority are visually flagged
TTL display: see exactly how long until the cache expires
Shareable URLs: pre-fill domain + type via query params
JSON API: GET /dns-check/api?domain=example.com&type=A

JSON API

Perfect for scripts and CI checks:

GET /dns-check/api?domain=example.com&type=MX

Returns a structured JSON object with per-resolver answers, TTLs, and a propagation summary string.

Zero dependencies

Built on Node's built-in https module making DoH requests. No npm packages, no rate limits, no API keys required.

Give it a try next time you're waiting for a new domain or DNS change to propagate.