From an email to old customers of DYN services:
"Oracle is announcing the end-of-life for the free Standard DNS service in favor of the enhanced, paid subscription version on the Oracle Cloud Infrastructure platform. On May 31, 2020, the “EOL Date”, the Standard DNS will be retired and will no longer be available."
The following capabilities are not currently supported in Oracle Cloud Infrastructure DNS:
Webhop (HTTP redirect)
Dynamic DNS
Zone transfer to external nameservers
DNSSEC
https://www.oracle.com/corporate/acquisitions/dyn/technologies/migrate-your-services/