Nice website, but I feel like calling it "wire wiki" is quite ambitious. Currently, it's a (beautiful) DNS lookup tool, but that's about it. I expected something like RIPE Stat [0], or something like the undersea cable map [1] (based on the "wire" in the name). Also, if you're doing DNS, take a look at resolve.rs [2], they have some nice DNS tools, though not as pretty as yours :)
And since you mentioned scanning the IPv4 address space for DNS servers - I did that as well at a some point for a product I've built (and even have a patent on). The list of servers you're going to get with a naive scanning approach is not what you want. It won't include the servers you probably want (such as the customer-facing DNS servers of ISPs) and will include an insane amount of junk like home routers or weird IoT devices that expose their port 53. Hit me up via the email in my profile if you want to chat.
[1]: https://www.submarinecablemap.com/
[2]: https://resolve.rs/