# Constants
LTSC2016 (Windows Server 2016) is an alias for [RS1].
LTSC2019 (Windows Server 2019) is an alias for [RS5].
LTSC2022 (Windows Server 2022) is an alias for [V21H2Server].
RS1 (version 1607, codename "Redstone 1") corresponds to Windows Server 2016 (ltsc2016) and Windows 10 (Anniversary Update).
RS2 (version 1703, codename "Redstone 2") was a client-only update, and corresponds to Windows 10 (Creators Update).
RS3 (version 1709, codename "Redstone 3") corresponds to Windows Server 1709 (Semi-Annual Channel (SAC)), and Windows 10 (Fall Creators Update).
RS4 (version 1803, codename "Redstone 4") corresponds to Windows Server 1803 (Semi-Annual Channel (SAC)), and Windows 10 (April 2018 Update).
RS5 (version 1809, codename "Redstone 5") corresponds to Windows Server 2019 (ltsc2019), and Windows 10 (October 2018 Update).
V1607 (version 1607, codename "Redstone 1") is an alias for [RS1].
V1703 (version 1703, codename "Redstone 2") is an alias for [RS2].
V1709 (version 1709, codename "Redstone 3") is an alias for [RS3].
V1803 (version 1803, codename "Redstone 4") is an alias for [RS4].
V1809 (version 1809, codename "Redstone 5") is an alias for [RS5].
V1903 (version 1903) is an alias for [V19H1].
V1909 (version 1909) is an alias for [V19H2].
V19H1 (version 1903, codename 19H1) corresponds to Windows Server 1903 (semi-annual channel).
V19H2 (version 1909, codename 19H2) corresponds to Windows Server 1909 (semi-annual channel).
V2004 (version 2004) is an alias for [V20H1].
V20H1 (version 2004, codename 20H1) corresponds to Windows Server 2004 (semi-annual channel).
V20H2 corresponds to Windows Server 20H2 (semi-annual channel).
V21H1 corresponds to Windows Server 21H1 (semi-annual channel).
V21H2Server corresponds to Windows Server 2022 (ltsc2022).
V21H2Win10 corresponds to Windows 10 (November 2021 Update).
V21H2Win11 corresponds to Windows 11 (original release).
V22H2Win10 corresponds to Windows 10 (2022 Update).
V22H2Win11 corresponds to Windows 11 (2022 Update).
Windows Server 2025 build 26100.