Cloudflare

Cloudflare, Inc. announces its routes under Autonomous System 13335, one of the world's most interconnected networks, spanning more than three hundred cities. It provides content delivery, DDoS protection, authoritative DNS, Zero Trust security, and serverless compute to millions of websites from edge locations placed close to end users. Cloudflare's anycast architecture means the same addresses are advertised from many locations at once, so AS13335 sits in front of a substantial fraction of the web. Registered in the United States, it is among the most frequently observed networks in internet measurement. Because it relies on anycast, a single address may be served from many cities at once, which makes precise geolocation of Cloudflare-fronted sites difficult.