in against the gods there are first shown 9 mortal realms i.e.
ELEMENTARY PROFOUND
NASCENT PROFOUND
TRUE PROFOUND
SPIRIT PROFOUND
EARTH PROFOUND
SKY PROFOUND
EMPORER PROFOUND
TYRANT PROFOUND
SOVEREIGN PROFOUND
after that there are 7 divine realms
DIVINE ORIGIN REALM
DIVINE SOUL REALM
DIVINE TRIBULATION REALM
DIVINE SPIRIT REALM
DIVINE KING REALM
DIVINE SOVEREIGN REALM
DIVINE MASTER
After these come true gods realms which supposedly went extinct and no one has entered these realm ever since
DIVINE EXTINCTION REALM
TRUE GOD REALM
CREATION GOD REALM
ANCESTRAL GOD REALM
there may or may not be a realm above this but in the novel there is no mention so can't say about that.