download.developer.apple.com

What it serves

Apple's enterprise host list names both in its Apps and additional content section, for “Xcode downloadable components”.

Xcode components, such as platform support and simulators, are large. Downloading one can be several gigabytes.

Apple doesn't say which process does the download.

What breaks if you block it

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 lists.

Notes

Download Xcode components on your usual network. They are among the largest downloads on a developer's Mac.

Apple’s rules for its hosts

Apple’s list, Use Apple products on enterprise networks, 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 for AI agents.

Sources

• Apple Support: Use Apple products on enterprise networks

Checked on 1 November 2026.

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