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Windows 10 (Redstone 4) Preview for PCs Build 16353
Released to Fast Ring: 31 August 2017
Source: Announcing Windows 10 Insider Preview Build 16353 for PC (Skip Ahead)
Days Since Last Fast Ring Build: 08 days (Build 16273)
Windows 10 (Redstone 4) Preview for PCs Build 16273
Released to Fast Ring: 23 August 2017
Source: Announcing Windows 10 Insider Preview Build 16273 for PC
Days Since Last Fast Ring Build: 21 days (Build 16257)
Windows 10 (Redstone 4) Preview for PCs Build 16257
Released to Fast Ring: 02 August 2017
Source: Announcing Windows 10 Insider Preview Build 16257 for PC & Build 15237 for Mobile
Days Since Last Fast Ring Build: 7 days (Build 16251)
Windows 10 (Redstone 4) Preview for PCs Build 16251
Released to Fast Ring: 26 July 2017
Source: Announcing Windows 10 Insider Preview Build 16251 for PC & Build 15235 for Mobile
Days Since Last Fast Ring Build: N/A - First build released for Redstone 4