Diagnostics, analytics and ads

diagassets.apple.com

diagassets.apple.com is the Apple host that Apple lists for diagnostics. Apple says that devices might access it to help detect a possible hardware issue.

Run by ApplePorts: 443 TCPChecked: 1 November 2026

Short answer

The Apple host that devices use for diagnostics that help detect possible hardware issues.

Block with care

Blocking it may stop hardware diagnostics that need Apple's servers. Nothing else documented depends on it.

Matches
diagassets.apple.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 diagassets.apple.com in its Apple diagnostics section, on port 443, with proxy support, for every platform.

Apple's description is “Used by Apple devices to help detect possible hardware issues”.

This is hardware diagnostics, not the analytics you choose to share. Those are under analyticsd and SubmitDiagInfo.

What breaks if you block it

Block with care

Blocking it may stop hardware diagnostics that need Apple's servers. Nothing else documented depends on it.

What breaks if you block it

  • Diagnostics that check for hardware issues may fail to run or to finish.

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.

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

Checked on 1 November 2026.