Made a free tool that checks DNS propagation across 3 independent resolvers at once (Cloudflare, Google, Quad9)

Got tired of the "is it live yet?" guessing game during DNS migrations — checking from your own machine only tells you what your resolver cached, which might be completely different from what everyone else sees. Built a checker that queries Cloudflare, Google, and Quad9 simultaneously for A, AAAA, MX, TXT, and NS records, and flags exactly which records disagree between them (the actual sign something's still propagating, vs guessing). Also flags NS-record mismatches specifically, since those matter more than IP records during a full nameserver migration — a resolver can still be asking your old provider entirely. Free, no signup, rate-limited instead of paywalled. https://www.forgeplug.com/tools/dns-propagation-checker Curious if anyone here has a DNS migration horror story — the classic "works for me, broken for my colleague" split always seems to trip people up.