 The following is a table of major Darwin releases with their dates of release and their corresponding macOS releases.Note that the corresponding macOS release may have been released on a different date; refer to the macOS pages for those dates.The jump in version numbers from Darwin 1.4.1 to 5.1 with the release of Mac OS X v10.1.1 was designed to tie Darwin to the Mac OS X version and build numbering system, which in turn is inherited from NeXTSTEP.