| Business Email & Productivity | |
| iCloud Mail Apple's cloud-based email service with mailbox hosting. | 569.6K sites |
| Security & Bot Defense | |
| HSTS HTTP header forcing browsers to use secure HTTPS connections | 122.9M sites |
| SEO & Content Discovery | |
| Open Graph Metadata protocol controlling how page links preview on social platforms | 127.7M sites |
| other | |
| Apple-Engineering Network operator string for Apple engineering infrastructure | 6.8K sites |
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