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Your WAN address and any other single addresses are still individually delegated as their own zone as above.
==3. Auto reverse==
Auto reverse is a third option that works by filling in a PTR record for each IP4 address and a corresponding forward A record as well so that all of your IP addresses will have a valid reverse entry automatically. This is mainly for customers who are not interested in setting up any reverse entries but need something in place to avoid problems with some servers. If you also use A+reverse records in a domain then your IPs will have two PTR records, both valid.
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==
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