Updates and downloads

lcdn-registration.apple.com

A Mac that provides Content Caching needs lcdn-registration.apple.com to register, suconfig.apple.com for configuration and xp-cdn.apple.com for reporting.

Run by ApplePorts: 443 TCP (lcdn-registration, xp-cdn), 80 TCP (suconfig)Checked: 1 November 2026

Short answer

Apple's hosts that a Content Caching Mac uses to register, get its configuration and report.

Safe to block

Safe to block if this Mac doesn't offer Content Caching. If it does, caching stops working.

Matches
lcdn-registration.apple.com suconfig.apple.com xp-cdn.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 says that a Mac that provides Content Caching needs these three hosts, plus the hosts of the content it caches.

Apple lists lcdn-registration.apple.com for “Server registration”, suconfig.apple.com for “Configuration” and xp-cdn.apple.com for “Reporting”.

On a Mac, Content Caching is AssetCache.

Processes that use it

AssetCachePart of macOS. It is Content Caching. It keeps Apple downloads on this Mac and gives them to other Apple devices on the same network.Process →

What breaks if you block it

Safe to block

Safe to block if this Mac doesn't offer Content Caching. If it does, caching stops working.

What breaks if you block it

  • This Mac can't register as a Content Caching server, so other devices download from Apple directly.

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.