---
title: "valid.apple.com: what it is and what breaks if you block it · Kilobat"
url: "https://kilobat.app/hosts/valid-apple-com"
description: "valid.apple.com is one of Apple's certificate validation hosts. Why Macs connect to it, and what breaks if you block it."
---

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.

Run by Apple · Ports: 443 TCP · Checked: 1 November 2026

## 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`](https://kilobat.app/processes/trustd), so its connections here are certificate checks.

## Processes that use it

- [trustd](https://kilobat.app/processes/trustd): Part of macOS. It checks certificates for every app, and asks certificate authorities whether a certificate was revoked. Its connections are small.

## 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](https://kilobat.app/docs/blocking#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](https://support.apple.com/en-us/101555), 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](https://kilobat.app/docs/agents#agent-network-log) for AI agents.

## Sources

- [Apple Support: Use Apple products on enterprise networks](https://support.apple.com/en-us/101555)
- trustd(8), man page installed with macOS 27.2

Checked on 1 November 2026.

## Related

- [ocsp.apple.com](https://kilobat.app/hosts/ocsp-apple-com): Apple's certificate status (OCSP) servers. The Mac asks them whether an Apple-issued certificate has been revoked.
- [crl.apple.com](https://kilobat.app/hosts/crl-apple-com): Apple's hosts for certificate revocation lists and certificates, used to validate the certificates of Apple's services.