Iron

Iron
Version of Microsoft Windows
Windows 10 logo and wordmark.svg
20324 Enterprise Desktop.png
OS familyWindows 10 (NT 10.0)
Version
Codename
Preliminary name
SemesterIron
Architecturex86, x64, ARM64
Latest build
Release date
Support end
Replaces
Manganese
Replaced by
Cobalt

Iron is the 21H1 development semester of Windows as a service, the commercial release of which is Windows Server 2022. It was later followed by Cobalt in the first half of 2021.

List of known builds[edit | edit source]

This list only includes client builds of Iron. For server builds, see Windows Server 2022 § List of known builds.

Pre-Dev Channel[edit | edit source]

Confirmed build 20124
Confirmed build 20125.1000
Confirmed build 20128.1000
Confirmed build 20129
Confirmed build 20132
Confirmed build 20133.1000.rs_prerelease.200519-1427
Confirmed build 20133.1000.rs_onecore_dep.200519-1740
Confirmed build 20133.1001
Confirmed build 20136.100?
Confirmed build 20138.1001
Confirmed build 20140.rs_onecore_base2_sfs2
Confirmed build 20140.1001
Confirmed build 20142.1000
Confirmed build 20144.1000.rsmaster.200604-1346
Confirmed build 20145.1001.rs_opt.200605-1833
Confirmed build 20145.rs_onecore_sigma_grfx.200607-1704
Confirmed build 20148.rs_onecore_dep

Dev Channel (rs_prerelease branch)[edit | edit source]

Leaked build 20150.1000.rs_prerelease.200612-1734
Confirmed build 20151.rs_prerelease
Leaked build 20152.1000.rs_prerelease.200617-1502
Confirmed build 20152.1001
Confirmed build 20153.1000
Confirmed build 20156.1000
Confirmed build 20158.rs_prerelease.200624-1504
Confirmed build 20159.1000.rs_onecore_dep.200625-1700
Leaked build 20161.1000.rs_prerelease.200627-1754
Confirmed build 20165.1000
Confirmed build 20165.1001
Confirmed build 20166.1000
Confirmed build 20167.rs_onecore_dep.200707-1700
Confirmed build 20168.rs_prerelease.200708-1420
Leaked build 20170.1000.rs_prerelease.200710-1419
Confirmed build 20170.1001
Confirmed build 20171
Confirmed build 20171.1000
Confirmed build 20172.rs_prerelease.200714-1314
Leaked build 20175.1000.rs_prerelease.200717-1349
Confirmed build 20175.rs_wdatp.200717-1350
Confirmed build 20175.1001
Confirmed build 20177.rs_prerelease.200722-1439
Leaked build 20180.1000.rs_prerelease.200725-1714
Confirmed build 20181.rs_onecore.200727-1408
Confirmed build 20182.rs_onecore_sigma.200728-1709
Confirmed build 20184.1001.rs_onecore_sigma_dplat.200731-1808
Leaked build 20185.1000.rs_prerelease.200731-1415
Leaked build 20190.1000.rs_prerelease.200807-1609
Confirmed build 20191.1000
Confirmed build 20192
Confirmed build 20192.rs_onecore_ens.200811-1500
Confirmed build 20193
Confirmed build 20194.1000.rs_onecore_dep.200813-1700
Confirmed build 20195
Confirmed build 20195.1000
Confirmed build 20195.1001
Confirmed build 20196.rs_prerelease.200817-1415
Leaked build 20197.1000.rs_prerelease.200818-1420
Confirmed build 20199.1000
Confirmed build 20200.1000.rs_prerelease.200821-1345
Leaked build 20201.1000.rs_prerelease.200822-1922
Confirmed build 20203.rs_apps.200825-1410
Confirmed build 20203.rs_onecore_base2_hyp.200826-1700
Confirmed build 20204.1000
Confirmed build 20205.1000.rs_prerelease.200827-1444
Leaked build 20206.1000.rs_prerelease.200828-1431
Confirmed build 20207.rs_prerelease.200831-1335
Leaked build 20211.1000.rs_prerelease.200904-1619
Confirmed build 20211.1001
Leaked build 20211.1005.rs_prerelease_flt.200904-1700
Confirmed build 20212.rs_prerelease.200908-1351
Leaked build 20215.1000.rs_prerelease.200911-1500
Leaked build 20221.1000.rs_prerelease.200919-1857
Confirmed build 20222.1000.rs_prerelease.200921-1335
Confirmed build 20222.1001
Confirmed build 20223.rs_onecore_dep.200922-1700
Leaked build 20226.1000.rs_prerelease.200925-1415
Confirmed build 20227.1044.rs_onecore_base2_hyp.200929-1700
Confirmed build 20230
Leaked build 20231.1000.rs_prerelease.201002-1444
Leaked build 20231.1005.rs_prerelease_flt.201002-1518
Confirmed build 20233.rs_prerelease.201006-1449
Confirmed build 20233.rs_onecore_base.201006-1616
Confirmed build 20235.1000.rs_prerelease.201008-1419
Leaked build 20236.1000.rs_prerelease.201009-1631
Confirmed build 20236.1001
Leaked build 20236.1005.rs_prerelease_flt.201009-1648
Confirmed build 20239.1000.rs_prerelease.201014-1420
Leaked build 20241.1000.rs_prerelease.201016-1450
Leaked build 20241.1005.rs_prerelease_flt.201017-1308
Confirmed build 20241.rs_prerelease.201019-2018

Dev Channel (fe_release branch)[edit | edit source]

Leaked build 20246.1.fe_release.201024-2009
Confirmed build 20246.1000
Confirmed build 20250.1.fe_release.201029-1434
Leaked build 20251.1.fe_release.201030-1438
Confirmed build 20256.1.fe_release.201105-1428
Leaked build 20257.1.fe_release.201106-1554
Confirmed build 20257.1000
Confirmed build 20261.1.fe_release.201112-1434
Confirmed build 20261.1000.fe_release_prs.201112-1446
Leaked build 20262.1.fe_release.201113-1436
Leaked build 20262.1010.fe_release_svc_prod1.201113-1601
Confirmed build 20269.1.fe_release.201123-1422
Leaked build 20270.1.fe_release.201124-1440
Confirmed build 20271.1000
Confirmed build 20274.1001
Confirmed build 20276.1.fe_release.201204-1334
Confirmed build 20276.1000
Leaked build 20277.1.fe_release.201207-1545
Confirmed build 20277.1000
Confirmed build 20278.1.fe_release.201208-1412
Confirmed build 20278.1000
Leaked build 20279.1.fe_release.201209-1322

Post-Dev Channel[edit | edit source]

Confirmed build 20279.1001
Confirmed build 20279.1002
Confirmed build 20279.1003
Confirmed build 20280.1000.fe_release_dep.210106-1700
Leaked build 20282.1.fe_release.210111-1506
Leaked build 20285.1.fe_release.210116-1100
Leaked build 20287.1.fe_release.210124-1100
Leaked build 20289.2.fe_release.210129-1837
Leaked build 20292.1.fe_release.210205-1504
Confirmed build 20293
Leaked build 20295.1.fe_release.210212-1600
Leaked build 20298.1.fe_release.210220-1636
Leaked build 20303.1.fe_release.210226-1630
Leaked build 20308.1.fe_release.210305-1700
Leaked build 20313.1.fe_release.210312-1606
Leaked build 20317.1.fe_release.210318-1714
Leaked build 20324.3.fe_release.210327-1200
Confirmed build 20324.1000.fe_release_prs.210329-1100
Leaked build 20339.2.fe_release.210417-1100
Microsoft Windows
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Desktop operating systems
Server operating systems
Mobile operating systems
Canceled operating systems
Windows 10 versions
Windows 11 versions
Embedded versions
Miscellaneous
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