--- title: "*.apple-cloudkit.com: what it is and what breaks if you block it · Kilobat" url: "https://kilobat.app/hosts/apple-cloudkit-com" description: "*.apple-cloudkit.com is Apple's CloudKit service for iCloud data, and api.apple-cloudkit.com handles app notarization checks on macOS. What breaks if you block it." --- Sync and cloud storage # *.apple-cloudkit.com Hosts under `apple-cloudkit.com` belong to Apple's CloudKit, the iCloud service that apps use to store and sync data. Apple also lists `api.apple-cloudkit.com` for app notarization on macOS. Run by Apple · Ports: 443 TCP · Checked: 1 November 2026 ## Short answer Apple's CloudKit service. Apps sync their iCloud data through it, and Apple lists api.apple-cloudkit.com for app notarization on macOS. Don’t block Don't block it. iCloud sync for many apps stops, and macOS can't do notarization checks for apps. Matches `*.apple-cloudkit.com` A name with `*.` covers every name under it: `*.push.apple.com` matches `1-courier.push.apple.com`. ## What it serves Apple's enterprise host list names `*.apple-cloudkit.com` in its iCloud section, for “iCloud services”, on TCP port 443. In the “Apps and additional content” section, Apple lists `api.apple-cloudkit.com` for “App notarization” on macOS. Gatekeeper's online checks need it. On a Mac, [`cloudd`](https://kilobat.app/processes/cloudd) backs CloudKit, so most CloudKit traffic shows under it. Apple Platform Security also says that Screen Time and iCloud Keychain data sync through CloudKit. ## Processes that use it - [cloudd](https://kilobat.app/processes/cloudd): Part of macOS. It syncs the iCloud data of apps that use CloudKit, so its traffic belongs to those apps. - [syspolicyd](https://kilobat.app/processes/syspolicyd): Part of macOS. It runs the system policy that includes Gatekeeper, which checks new and changed apps for known malware and revoked certificates. - [ScreenTimeAgent](https://kilobat.app/processes/screentimeagent): Part of macOS. It supports Screen Time, which can sync your usage and limits across your devices through iCloud. - [secd](https://kilobat.app/processes/secd): Part of macOS. It controls access to keychain items. With iCloud Keychain on, your passwords and other synced items travel between your devices. - [siriactionsd](https://kilobat.app/processes/siriactionsd): Part of macOS. It runs and syncs the shortcuts you make in the Shortcuts app, so iCloud sync of shortcuts can show under it. ## What breaks if you block it Don’t block Don't block it. iCloud sync for many apps stops, and macOS can't do notarization checks for apps. What breaks if you block it - Apps that keep data in iCloud stop syncing between your devices. - Gatekeeper's notarization checks can't reach Apple. - Screen Time and iCloud Keychain sync stop, since Apple says that they use CloudKit. With Kilobat Pro and the network filter, you can block a host for every app or for one app: in Connections, select a connection and choose Block. Apple’s own services are never blocked by Kilobat’s [Protection](https://kilobat.app/docs/blocking#protection) lists. ## Notes Apple says that its services fail any connection that uses HTTPS interception. A proxy that inspects TLS breaks CloudKit. ## Apple’s rules for its hosts Apple’s list, [Use Apple products on enterprise networks](https://support.apple.com/en-us/101555), says that devices open these connections, not Apple’s servers. Apple services fail any connection that uses HTTPS interception, so a proxy that inspects TLS should leave Apple’s hosts alone. If a firewall allows hosts by name, allowing `*.apple.com` covers most Apple services, Apple says. A firewall that works only with addresses can allow `17.0.0.0/8` for IPv4, and `2403:300::/32`, `2620:149::/32` and `2a01:b740::/32` for IPv6. To see which app on your Mac opened a connection to this host, use Kilobat’s Connections tab, or the [agent network log](https://kilobat.app/docs/agents#agent-network-log) for AI agents. ## Sources - [Apple Support: Use Apple products on enterprise networks](https://support.apple.com/en-us/101555) - [Apple Platform Security: Screen Time security](https://support.apple.com/guide/security/screen-time-security-secd8831e732/web) - [Apple Platform Security: Secure keychain syncing](https://support.apple.com/guide/security/secure-keychain-syncing-sec0a319b35f/web) Checked on 1 November 2026. ## Related - [gateway.icloud.com](https://kilobat.app/hosts/gateway-icloud-com): Apple's CloudKit gateway. Apple lists it for CloudKit content, including XProtect malware definitions and Voice Control assets. - [*.icloud.com](https://kilobat.app/hosts/icloud-com): Apple's iCloud domain. Apple lists *.icloud.com for iCloud services; specific hosts under it have their own pages.