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> If you allow anything to be a TLD the root servers need to know about everything, which isn't really feasible

I wonder about that: The number of TLDs in my scenario would be approximately equal to the number of user-registered[0] domains now.

The .com root servers already need to know a large fraction of all 'user-registered' domains, and will need to scale to a much larger set of data as the number of domains grows.

Therefore, I expect that scaling to all 'user-registered' domains wouldn't exceed the root servers' capacity.

[0] I can't think of the technical term at the moment, but domains such as ycombinator.com, bbc.co.uk, ox.ac.uk, etc. Second-level isn't quite correct (see the .uk examples), and I know parsing the user-registered part is a bit of a challenge; see https://publicsuffix.org.




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