The aforementioned machine 20cm from my left elbow has a content DNS server, too. Not wholly satisfactory as it's not a guaranteed stable address.
It's doing double duty though, with split horizon, as the root content DNS server for the LAN, serving copies of the ICANN data and the data for Estonia and the island of Niue.
You'll know that you've truly arrived in the self-hosting world when you have your own replica of Niue. (-:
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