CDN
Websites using Fastly
- popular sites behind it
- 8 of 119
Popular sites
Popular sites using Fastly
From the 119 popular domains we check every day, most visited first. Each tag shows what Fastly runs for the site.
About
What is Fastly?
Fastly runs a CDN with programmable caching and edge compute. Large publishers, marketplaces and developer platforms use it to serve pages and APIs from servers close to their visitors.
Like any CDN, Fastly answers with its own addresses and hides the origin server. Its cache servers name themselves in the x-served-by header.
Detection
How to tell a site uses Fastly
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 Fastly.
- AS54113
IP ranges
Fastly uses too many ranges to list here, and they change over time.
Fastly's published IP listCNAME and reverse DNS
A CNAME record or a reverse DNS name under one of these hosts points at Fastly.
- *.fastly.net
- *.fastlylb.net
Response headers
Fastly adds these headers to the responses it serves.
- x-fastly-request-id
- x-served-by: /\bcache-[a-z]/
FAQ
Fastly questions
ASNs, IP ranges and how to check whether a site uses Fastly.
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Other CDNs
How to detect each one, and the popular sites that use it.
Free lookup tool
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