Learn about OpenStack Designate's new "Shared Zones" feature and its implementation of Classless IN-ADDR.ARPA delegation in this 16-minute technical talk. Explore solutions for managing IPv4 address DNS PTR record assignments in smaller blocks without creating individual DNS zones per address - a crucial capability given the worldwide depletion of IPv4 address blocks. Discover how shared zones enable multiple OpenStack projects to manage recordsets within a single DNS zone, understand the technical implementation of classless IN-ADDR.ARPA delegation in Designate, and examine potential future developments for automating this process through OpenStack Neutron integration for floating IP and port creation. Follow along as speaker Michael Johnson breaks down DNS zones in Designate, shared zone implementation and capabilities, IN-ADDR.ARPA zones, IPv4 challenges, and practical workarounds for modern edge deployment scenarios requiring IPv4 endpoints.