
Windows Server 2016 OS Build 14393.970 refers to a specific release state of the operating system reached via the cumulative update KB4016635. Release Timeline & Lifecycle
Nano Server Support: Continued refinements for the Nano Server installation option, including better recovery console tools and image building modules. Lifecycle and Support Milestones windows server 2016 build 14393970 enus april 2017 2021
But the actual build number inside would be 14393.970. Windows Server 2016 OS Build 14393
If you had the original MSDN media from April 2017: April 2017 2021 : This seems to be
April 2017 2021: This seems to be a bit confusing or possibly a typo. If referring to updates or support periods: