1 Answer. This is documented in the Fedora documentation. From the version table there, RHEL 7 is based on Fedora 19 with some changes taken from later versions. The relationship is quite a bit more complex than a simple table can represent.

Which distribution is CentOS based on what about Fedora?

Key differences between CentOS and Fedora

CentOS is based on RHEL and on the same code base and can be used, or the benefit of stability that is derived from RHEL, whereas Fedora is a base for implementing new functionalities mostly and is beneficial in this case.

What distro is CentOS based on?

Like how Ubuntu is forked from Debian, CentOS is based on the open source code of RHEL (Red Hat Enterprise Linux), and provides an enterprise-grade operating system for free. The first version of CentOS, CentOS 2 (named as such because it's based on RHEL 2.0) was released in 2004.