Kuuko / Learn

Blocking3 minutesChecked 28 October 2026

What Kuuko can’t block

Why Instagram’s app still works, and what helps.

Kuuko blocks a tracker by refusing to look up its name. Some tracking needs no name that Kuuko could refuse.

Apps that talk to their own company

Kuuko can’t stop apps that send tracking data to their own company’s servers, the same ones the app needs to work, as Instagram does with Meta.

We tested it. On 25 October 2026, with Social networks on, Safari couldn’t open facebook.com, but the Instagram app kept working. App Privacy Report showed it connecting to plain number addresses instead of names. Those addresses belong to Facebook, Inc. (157.240.0.0/16) and Meta Platforms Ireland (185.60.216.0/22), according to the address registries ARIN and RIPE.

What helps: use such an app less, or delete it. Screen Time can set a daily limit for it.

Trackers under the website’s own name

  • Some websites send tracking data to an address under their own name, such as stats.example-shop.com. Kuuko can’t tell it apart from the shop itself.
  • Kuuko does check names that only point to a tracker behind the scenes.

Data sent from server to server

  • A shop can send what you bought from its own server straight to Meta. Meta calls this the Conversions API. Your device never sees it, so no blocker can stop it.
  • Meta matches such a purchase to people with details such as the email address, scrambled first, the phone number or the internet address.
  • An alias helps a little: the shop has an address Meta doesn’t know. Your phone number or internet address can still match.

Check it on your iPhone

App Privacy Report shows which apps contacted which addresses in the last 7 days. Check your apps yourself

Sources

All Learn articlesNext: Check your apps yourself