7. Domain Name Service Considerations

One aspect of Internet services that was notably affected by the move

to CIDR was the mechanism used for address-to-name translation: the

IN-ADDR.ARPA zone of the domain system. Because this zone is

delegated on octet boundaries only, the move to an address assignment

plan that uses bitmask-oriented addressing caused some increase in

work for those who maintain parts of the IN-ADDR.ARPA zone.

A description of techniques to populate the IN-ADDR.ARPA zone when

and used address that blocks that do not align to octet boundaries is

described in [RFC2317].