The Domain Name System (DNS) is one of the most critical services for the daily functioning of the Internet. It allows names to be resolved into IP addresses and vice versa through a hierarchical system of distributed servers. As a prelude to the DNS Flag day 2020, a study was conducted to assess the EDNS and TCP readiness level of authoritative DNS servers (Name Server - NS) on reverse zones of IP addresses allocated by AFRINIC to its members and authoritative servers of African ccTLD domains. Such a study makes it possible to assess the level of DNS compliance in Africa with good practices related to EDNS, but also to highlight various related aspects of good practices and DNS standards such as location, geographic distribution, resilience, and IPv6 accessibility or reachability of these authoritative servers.