Which CDN serves a domain
One lookup returns the provider, or providers, actually delivering a site, with the confidence level and the evidence behind the call.
CDN FinderFREE
CDN Finder.
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 cloud ranges, with a shareable evidence report. The tool CDNFinder.com will point to.
AT A GLANCE
Flagshipfirst tool to shipFreeno signup required25+provider signatures trackedMulti-CDNstack detection built inShareableevidence-backed reportsLiveand free to run
Part of the CDN World toolkit · FREE TO RUN
Edge found
Targetexample.comChannels
- DNS & CNAME chain analysisCore
- Response-header fingerprintsCore
- HTTP/2 & protocol hintsCore
- Cloud-range recognitionSupporting
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The report
What you’ll get.
THE OUTPUTInside the report
Detected provider(s) with confidenceIncluded
Each provider found, scored by how many independent signals agree.
Signal-by-signal evidenceIncluded
The raw DNS records, headers and certificate fields behind every detection.
Hostname mapIncluded
Which provider serves www, static assets, APIs and media, the multi-CDN picture at a glance.
Shareable linkIncluded
A stable URL for the report, ready for a procurement thread or an incident channel.
Freeto use, forever
No signuprequired to run it
Shareableevidence-backed reports
Live nowand free to run
What it answers
CDN Finder in four questions.
Multi-CDN stacks, untangled
Many estates split traffic: one network for static, another for dynamic, a third for video. CDN Finder maps which hostname rides which provider.
The evidence trail
Not just a verdict: every signal that fired, DNS chain, headers, certificate, so you can verify the detection yourself.
Changes over time
Re-run a domain after a migration or renewal and confirm traffic actually moved where the contract says it did.
Under the hood
How it works.
A transparent look at exactly what the tool checks, and how it reaches its answer.
DETECTIONHow it works
- 01Core
DNS & CNAME chain analysis
· resolution pathFollows the full resolution chain to the terminating edge hostname, the strongest single signal for most CDNs.
- 02Core
Response-header fingerprints
· server, via, cache headersProvider-specific headers and cache-status formats, matched against our signature library covering 25+ networks.
- 03Core
HTTP/2 & protocol hints
· delivery cluesResponse protocol and connection signals add supporting context when a provider is ambiguous from DNS alone.
- 04Supporting
Cloud-range recognition
· self-hosted edgesResolved addresses are checked against major cloud ranges (AWS and others) so self-hosted platforms like Amazon are named rather than shown as “no CDN.”
Use cases
Who it’s for.
Procurement due diligence
Verify what a prospective vendor, or your own incumbent, actually runs before you negotiate.
Competitive research
See which networks power the sites in your market, and how the leaders split their traffic.
Migration verification
Confirm cutovers actually completed: the fastest answer to “is traffic really on the new CDN?”
Incident triage
When a site misbehaves, knowing whose edge is in front is step one of the diagnosis.
Status & access
Free to use. Live now, free to run.
STATUSWhere the build stands
FREEFreeto use, no signup
Liveand free to run
200+assessments/yr behind the data
Liveand free to run
- Built on assessment data
The toolkit automates the detection and benchmark data behind the assessments we already run, the tools are how we prove the data is good.
- Free, no signup, shareable
Every tool ships free with shareable reports; the business model is the advisory behind it, not your email address.
- Available now
The tool is live and free to run, with detection we keep refining as we expand our signature coverage.
LIVE NOWRun a lookup →
Want a human read on the result? A free assessment runs the same analysis, human-graded, usually within 24 hours, and gives you a benchmark against pooled volume pricing.
Live now · free to run, no signup
Keep reading
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.
DNS Finder FreeIdentify the DNS provider and audit records→HTTP Header Analyzer FreeGrade security headers and inspect caching→TLS & Cache Checker FreeInspect TLS config and cache behavior→WAF Detector FreeDetect the web application firewall in use→Bot Detection FreeDetect the bot-management / anti-bot vendor→
Want the full picture?
Get a free infrastructure assessment ↗A free assessment reviews your whole delivery and security posture, human-graded.
FAQCDN Finder questions,
CDN Finder questions,
answered straight.
Is CDN Finder live?
Yes — it's the flagship of the toolkit, live and free to run: no signup, with a shareable evidence report on every check.
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 redirects here.
I need the answer today, what now?
A free assessment gets you the same detection, human-graded, usually within 24 hours.