Customers using GitHub Enterprise may wish to use CircleCI Cloud. Currently, CircleCI cloud is supported when using GitHub Enterprise Cloud. If you are using GitHub Enterprise Server(GHES), you will need to use CIrcleCI Server. You can find more information on getting started with CircleCI server in our docs here.

Also, regarding the supported GHES versions, all the supported CircleCI server versions are primarily compatible with the recent version. Please contact CircleCI support if you are wondering which versions are being supported.