Security and accounts
valid.apple.com
valid.apple.com is an Apple host for certificate validation. Apple lists it for all its platforms, on port 443, and says that it works through proxies.
Short answer
An Apple certificate validation host. Apple lists it for every platform, on port 443, with proxy support.
Don’t block
Don't block it. Apple lists it as needed to validate certificates, so secure connections to Apple can fail.
- Matches
valid.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 valid.apple.com in its Certificate validation section, for “Certificate validation”.
Apple says that devices must be able to reach the certificate validation hosts to validate the certificates used by its services.
On a Mac, certificate evaluation is the job of trustd, so its connections here are certificate checks.
Processes that use it
What breaks if you block it
Don’t block
Don't block it. Apple lists it as needed to validate certificates, so secure connections to Apple can fail.
What breaks if you block it
- Certificate validation for Apple's services may fail, so those services can stop connecting.
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
Apple doesn't say what kind of validation data this host serves, only that it is for certificate validation.
Apple says that its services fail connections that use HTTPS interception.
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
- trustd(8), man page installed with macOS 27.2
Checked on 1 November 2026.