Diagnostics, analytics and ads

metrics.icloud.com

metrics.icloud.com is the Apple host for iCloud device diagnostics. Apple lists it for every platform, on port 443 over TCP and UDP.

Run by ApplePorts: 443 TCP and UDPChecked: 1 November 2026

Short answer

Apple's host for iCloud device diagnostics.

Block with care

Blocking it stops iCloud device diagnostics from reaching Apple. Apple doesn't document whether iCloud services depend on it.

Matches
metrics.icloud.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 metrics.icloud.com in its iCloud section, for iCloud device diagnostics, with proxy support. Apple added it in January 2026.

Apple doesn't say what the diagnostics contain, or whether they depend on the Share Mac Analytics setting.

For the analytics that you choose to share, see analyticsd.

What breaks if you block it

Block with care

Blocking it stops iCloud device diagnostics from reaching Apple. Apple doesn't document whether iCloud services depend on it.

What breaks if you block it

  • iCloud device diagnostics can't reach Apple. Apple doesn't document other effects.

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.