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Please pay attention to random failures.
https://mstdn.maud.io/@omasanoriNXNSAttack: upgrade resolvers to stop new kind of random subdomain attack | The CZ.NIC Staff Blog https://en.blog.nic.cz/2020/05/19/nxnsattack-upgrade-resolvers-to-stop-new-kind-of-random-subdomain-attack/