ISITIN.CLOUD answers one question: paste in any website and it tells you which cloud provider actually hosts it.
I built it out of curiosity. The big providers all publish the IP ranges they own — AWS, Google, Azure, and the rest — so "who hosts this site?" is a question you can answer mechanically, if you bother to line the data up. Nobody had turned that into a one-box lookup, so I did.
The mechanism is deliberately small:
- pull each provider's published IP ranges from their public APIs
- resolve the site's IPs and match them against those ranges
The whole thing runs serverless on AWS Lambda — no box to keep alive, just a function that wakes up when someone asks. The kind of weekend project that pays off more as a sharpening exercise than as a product, but it does exactly what it says on the tin.