---
title: "Apple’s iOS 27 Safari blocklist blocked ad vendor The Trade Desk"
description: "The block is reversed only in the iOS 27.2 beta, so The Trade Desk remains unable to serve Safari ads until the update ships."
url: https://mactoreality.com/apples-ios-27-safari-blocklist-blocked-ad-vendor-the-trade-desk
published: 2026-10-07T21:15:40Z
updated: 2026-10-07T21:15:40Z
author: "Mac to Reality Newsdesk"
category: Rumours
tags: ["Privacy & security","Software"]
publisher: Mac to Reality
ai_assisted: true
apple_heat_impact: -1
---

# Apple’s iOS 27 Safari blocklist blocked ad vendor The Trade Desk

*The block is reversed only in the iOS 27.2 beta, so The Trade Desk remains unable to serve Safari ads until the update ships.*

**Key points**

- Apple's iOS 27 release blocked ad vendor The Trade Desk from serving ads in Safari, also affecting other iOS browsers via WebKit.
- The Trade Desk's bug report argued that Apple appeared to be aiming to block domains used for post-cookie identity, but the blocked addresses were for ad delivery, not identity tracking.
- The iOS 27.2 beta reverses the block, but The Trade Desk remains unable to serve Safari ads until the update ships.

Apple’s iOS 27 blocked The Trade Desk, a major ad-buying platform, from serving ads in Safari, trade journal [AdExchanger reports](https://www.adexchanger.com/platforms/apples-latest-operating-system-blocks-the-trade-desk-from-serving-ads-on-safari/) (via [AppleInsider](https://appleinsider.com/articles/26/10/07/apples-escalating-crackdown-on-ad-vendors-is-catching-some-innocent-victims)). Because the block occurs at the WebKit level, The Trade Desk was also prevented from delivering ads through other iOS browsers such as Chrome.

The Trade Desk submitted a bug report arguing that Apple’s aim appears to be to completely block domains that enable post-cookie identity, but the affected addresses were its ad request and delivery domain, not identity tracking. The bug report claims its logs show its advertising bids being blocked while Google’s bids went through normally.

The iOS 27.2 beta reverses the block, but since it is still in beta, The Trade Desk cannot serve Safari ads until the public release. [AdExchanger says](https://www.adexchanger.com/privacy/apple-has-far-reaching-plans-to-block-hundreds-of-programmatic-data-companies-from-ios/) it has seen a list of ad technology companies Apple is or may target, reportedly hundreds of firms, with Google potentially excluded. Apple also appears to be developing a dynamic blocklist that would allow blocking or unblocking advertisers without requiring an OS update.

Apple’s App Tracking Transparency, introduced in 2021, forced advertisers to ask users for permission to track them. After an initial drop, opt-in rates recovered, but advertisers found workarounds. Meta has criticised the restrictions, and antitrust authorities have investigated them. Meanwhile, Apple has been expanding its own advertising, including in Maps and potentially Visual Intelligence.

Apple has not commented on the iOS 27 blocklist. It remains unknown whether the Trade Desk block was deliberate or a mistake, whether Google is actually excluded from Apple’s list, or when iOS 27.2 will reach the public.

## Sources

- [AdExchanger: Apple’s Latest Operating System Blocks The Trade Desk From Serving Ads On Safari](https://www.adexchanger.com/platforms/apples-latest-operating-system-blocks-the-trade-desk-from-serving-ads-on-safari/)
- [AdExchanger: Apple Has Far-Reaching Plans To Block Hundreds Of Programmatic Data Companies From iOS](https://www.adexchanger.com/privacy/apple-has-far-reaching-plans-to-block-hundreds-of-programmatic-data-companies-from-ios/)
- [AppleInsider: Apple's escalating crackdown on ad vendors is catching some innocent victims](https://appleinsider.com/articles/26/10/07/apples-escalating-crackdown-on-ad-vendors-is-catching-some-innocent-victims)

*This report was written by the Mac to Reality newsdesk with AI assistance from the sources listed above, under the editorial policy at https://mactoreality.com/editorial-policy.*