CDN Finder.Which CDN is really serving that site?
Enter any domain and see which CDN, or stack of CDNs, is delivering it, detected from DNS chains, response-header fingerprints and TLS certificates, with a shareable evidence report. Built on the detection data behind 200+ assessments a year, and the tool CDNFinder.com will point to.
Try: github.comapple.comcloudflare.comamazon.com
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CDN Finder in four questions.
One lookup returns the provider, or providers, actually delivering a site, with the confidence level and the evidence behind the call.
Many estates split traffic: one network for static, another for dynamic, a third for video. CDN Finder maps which hostname rides which provider.
Not just a verdict: every signal that fired, DNS chain, headers, certificate, so you can verify the detection yourself.
Re-run a domain after a migration or renewal and confirm traffic actually moved where the contract says it did.
How it works.
The same signals our analysts use in paid assessments, automated.
Follows the full resolution chain to the terminating edge hostname, the strongest single signal for most CDNs.
CoreProvider-specific headers and cache-status formats, matched against our signature library covering 25+ networks.
CoreEdge certificates leak the operator: issuer chains and SAN patterns confirm or overrule ambiguous DNS.
CoreAnnounced ranges and ASN ownership resolve the cases where everything else is masked.
SupportingWhat you’ll get.
Each provider found, scored by how many independent signals agree.
IncludedThe raw DNS records, headers and certificate fields behind every detection.
IncludedWhich provider serves www, static assets, APIs and media, the multi-CDN picture at a glance.
IncludedA stable URL for the report, ready for a procurement thread or an incident channel.
IncludedWho it’s for.
Verify what a prospective vendor, or your own incumbent, actually runs before you negotiate.
See which networks power the sites in your market, and how the leaders split their traffic.
Confirm cutovers actually completed: the fastest answer to “is traffic really on the new CDN?”
When a site misbehaves, knowing whose edge is in front is step one of the diagnosis.
Free at launch. In build now.
The toolkit automates the detection and benchmark data behind the assessments we already run, the tools are how we prove the data is good.
Every tool ships free with shareable reports; the business model is the advisory behind it, not your email address.
First releases are in build. Dates are windows, not promises, we ship when the detection is trustworthy.
Want the answer before the tool exists? A free assessment runs the same analysis, human-graded, usually within 24 hours, and puts you on the early-access list for CDN Finder.
CDN Finder in context.
The research this tool automates.
More free CDN World tools
All part of the same toolkit — passive, non-intrusive, no signup.
CDN Finder questions,
answered straight.
When does CDN Finder launch?
It’s the flagship of the toolkit and the first release in build now, with a 2026 launch window. Join the early-access list from the tools page and we’ll notify you the day it ships.
Will it be free?
Yes, free to use with no signup required. It runs on the same detection data behind our paid assessments; the tool is how we prove the data is good.
Can it detect multi-CDN setups?
That’s a core design goal. Because it inspects hostnames independently, split estates, one provider for static, another for dynamic or video, show up as exactly that, not as a single confused answer.
How accurate is the detection?
Every verdict ships with its evidence: the DNS chain, headers and certificate fields that fired. Where providers mask signals, the report says so and scores confidence accordingly, no false certainty.
What’s the relationship to CDNFinder.com?
CDNFinder.com is our domain for this tool and will point at it when it ships.
I need the answer today, what now?
A free assessment gets you the same detection, human-graded, usually within 24 hours.
All product names, logos and brands referenced in tool reports are the property of their respective owners and are used for identification purposes only. CDN World tools perform passive, non-intrusive analysis. Tool capabilities and launch timing described on this page are plans, not commitments, and may change.