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Isn't it controlled by whoever is running the .arpa domain?



Yes and no. There is nothing [1] preventing any DNS server from responding authoritatively to a request that it is presented with, except a moral correctness to the protocol.

[1] If you ever wondered how openDNS or your ISP sends you spammy web pages when you try to resolve something that doesn't exist, or how the hotel hijacks your browser into giving you a login page, this is it. You look for google.com it notes you haven't logged in and returns the address for its paywall as the answer.

Oh except if you are running dnssec in which case it is a lot harder to lie about what you are authoritative for. But on my dns servers at home they all think they are authoritative for 10.in-addr.arpa. so that they will answer queries for that network.




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