Hello. I wrote a little book about DNS.

It’s called The Phone Book, because that’s what DNS is: a distributed phone book with really good caching.

You can read it in about twenty minutes. By the end, you’ll know how a name becomes an IP address, why changes “take time to propagate” (spoiler: they don’t, really), and how to debug the whole thing with one command. No prior expertise needed — if you’ve ever added a record at a registrar and waited for it to show up, you know enough to start.