Apple's Safari 27 Blocks The Trade Desk and Major Identity Providers at the Network Layer
iOS 27 has silently cut The Trade Desk off from serving any ads on Safari by adding its core delivery domain to Apple's blocklist, alongside UID 2.0, LiveRamp, ID5, and Permutive. Safari 27's new network-transport-layer blocking makes browser-side workarounds a dead end — forcing measurement teams to confront a world where a quarter of mobile web traffic is structurally unmeasurable by conventional means.
By Sarah Chen·8 min read