iOS 27 Is Silently Blocking Ad Tech's Biggest Identity Vendors

Apple began unconditionally blocking major data and identity vendors — including LiveRamp, Permutive and Audigent — with the launch of iOS 27 in mid-September. The blocks arrived without warning, and the programmatic ecosystem spent this week's Advertising Week New York scrambling to respond.

The timing compounds the disruption. Vendors found their services cut off only after the operating system shipped, leaving no runway to prepare workarounds or brief advertisers.

Who is affected so far?

The original blocklist named three of the most widely used players in ad tech:

• LiveRamp, the identity resolution giant whose RampID underpins countless match tables
• Permutive, a privacy-focused data platform used by publishers
• Audigent, a data and identity vendor

That's not a random set of names. These companies sit at the center of how advertisers recognize and reach users across the open web, which is why the fallout spread so fast.

Why does a silent block matter?

Apple didn't announce a policy change or publish new rules. It simply stopped the vendors from operating inside its ecosystem, and the industry discovered the damage after the fact.

For practitioners, that distinction matters. A published policy gives you time to test, adapt and budget. An unannounced technical block forces you to react, and reaction costs money — in re-engineering identity setups, in weakened match rates and in campaigns that suddenly can't find their audiences.

The chatter at Advertising Week New York this week reflects exactly that anxiety, with the programmatic ecosystem buzzing like, as one observer put it, "the inhabitants of an overturned beehive."

What happens next?

Watch whether Apple expands the blocklist beyond the original three names, and whether blocked vendors find technical or commercial routes back in. Until Apple states its position publicly, every workaround in the market is speculation, and buyers should pressure-test vendor claims before rebuilding pipelines around them.