Codename: Nahant (based on Fedora Core 3): Red Hat Enterprise Linux 4
Codename: Tikanga (based on Fedora Core 6): Red Hat Enterprise Linux 5
Codename: Santiago (based on a mix of Fedora 12, Fedora 13, and several modifications): Red Hat Enterprise Linux 6
Codename: Maipo (based on a mix of Fedora 19, Fedora 20, and several modifications): Red Hat Enterprise Linux 7
Codename: Ootpa (is based on Fedora 28, upstream Linux kernel 4.18, systemd 239, and GNOME 3.28.): Red Hat Enterprise Linux 8