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CDN

Websites using Cloudflare

Cloudflare runs a reverse proxy network in front of millions of sites, for caching, security and DNS.
popular sites behind it
26 of 119
popular sites on its DNS
16

Popular sites

Popular sites using Cloudflare

From the 119 popular domains we check every day, most visited first. Each tag shows what Cloudflare runs for the site.

About

What is Cloudflare?

Cloudflare runs one of the largest reverse proxy networks on the internet. Sites put it in front of their servers for caching, DDoS protection, a web application firewall and TLS.

Visitors connect to Cloudflare's addresses, not to the origin server, so a lookup of a site behind Cloudflare shows Cloudflare and hides the real host. Many sites also use Cloudflare only for DNS, which shows in their nameservers.

cloudflare.com

Detection

How to tell a site uses Cloudflare

A hosting check compares a site's DNS records, IP address and response headers with these signals. When several providers match, the one with the most matches wins.

  • Networks (ASN)

    IP addresses announced by these autonomous systems belong to Cloudflare.

    • AS13335
    • AS209242

  • IP ranges

    Cloudflare uses too many ranges to list here, and they change over time.

    Cloudflare's published IP list

  • CNAME and reverse DNS

    A CNAME record or a reverse DNS name under one of these hosts points at Cloudflare.

    • *.cdn.cloudflare.net

  • Response headers

    Cloudflare adds these headers to the responses it serves.

    • cf-ray
    • server: cloudflare

  • Nameservers

    A domain whose NS records point here uses Cloudflare for DNS, wherever the site runs.

    • *.cloudflare.com

FAQ

Cloudflare questions

ASNs, IP ranges and how to check whether a site uses Cloudflare.

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Other CDNs

How to detect each one, and the popular sites that use it.

Free lookup tool

Does a site use Cloudflare?

Enter a domain or IP to uncover hosting details, DNS records, and server location.