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The mapping of IPv6 reverse DNS zones must be made on nibble boundaries. That means, that if your official IPv6 address block does not have a prefix length divisible by 4, you have to split it in multiple reverse zones. GestióIP's free online subnet calculator includes a reverse zone generator which permits to easily map a given IPv6 address block in the corresponding reverse zones. The tool can be used for networks on nibble boundaries as well as networks on non-nibble boundaries.