According the latest Oracle note - Release Schedule of Current Database Releases (Doc ID 742060.1), Oracle has changed its release schedule/name since 188.8.131.52.
Oracle 184.108.40.206 = Oracle 18
Oracle 220.127.116.11 = Oracle 19
But it does say "This may change in the future to Oracle 20 as the last release for 12.2. "
You can read 2 blogs from Mike about the change: