Host reverse DNS lookup zones in Azure DNS | Microsoft Docs
Note. When you're creating classless reverse DNS lookup zones in Azure DNS, you must use a hyphen (-) instead of a forward slash (/) in the zone name.For example, for the IP range of 192.0.2.128/26, you'll use 128-184.108.40.206.in-addr.arpa as the zone name instead of 128/220.127.116.11.in-addr.arpa.. Although the DNS standards support both methods, Azure DNS doesn't support DNS zone names that ...
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