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Reverse DNS: Difference between revisions
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Most ADSL customers will have a small block of IPs which they can delegate using CNAME if they want. However all ADSL lines also have a single IP address for the external (WAN) side of their [[ADSL Router|ADSL router]]. This is always delegated as a single zone for the IP address.
==Reverse for /24 or larger==
If you have a block of 256 addresses or more, then reverse DNS delegation is done at the /24 level and setting CNAME or NS has the same effect. This means you are responsible for an entire reverse zone without the need for special CNAME entries, etc. Most people do not have such a large block of addresses.
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