CDN Detector — Identify Content Delivery Networks
Inspect response headers to identify CDN provider and cache signals
How to Use This Tool
- Submit a URL or domain — we normalize to HTTPS and validate safe fetch rules.
- Our server performs an HTTP request and captures response headers.
- Header patterns are checked for CDN-specific identifiers in priority order.
- Detected provider name assigns when matching signals appear — ray ID, cache headers, or vendor server strings.
- All examined signals return in the results object even when no CDN is identified.
About This Tool
Websites accelerate content through content delivery networks that cache assets at edge locations worldwide. VSPIC CDN detector fetches HTTP headers from your URL and analyzes CDN-specific signals — ray identifiers, cache status headers, request IDs, and server banners — to infer which provider fronts the site.
Enter a domain or full HTTPS URL. Results show detected provider name when confidence is high, a boolean cdnDetected flag, and raw signal headers for manual verification. Sites without CDN headers report no detection with full header transparency.
Common use cases
- •Measure download and upload speed
- •Test open ports on a home router or server
- •Trace routing paths to diagnose latency
Why detect CDN usage
CDN identification explains fast global load times, reveals why your IP lookup shows a different country than company headquarters, and helps security teams scope DDoS mitigation already in place.
Migration projects document incumbent CDN before cutover. Competitive research notes which edge platforms competitors rely on without accessing their infrastructure contracts.
Header signals we examine
Cloudflare typically sends cf-ray and cf-cache-status headers. Amazon CloudFront includes x-amz-cf-id. Fastly exposes x-fastly-request-id. Akamai may send x-akamai-transformed. BunnyCDN uses cdn-pullzone. Server headers containing cloudflare also contribute.
Signals display individually so engineers can diagnose false negatives when providers strip or rename headers at origin.
CDN versus origin hosting
Detection reflects the edge layer responding to our fetch, not necessarily the origin datacenter. Origin may sit on a different provider entirely behind the CDN tunnel.
Use shared hosting detector and website IP lookup on the resolved IP for origin hints after confirming CDN presence here.
Sites without CDN detection
Self-hosted sites, small VPS deployments, and some enterprise reverse proxies return no CDN signals. cdnDetected false with populated server header still informs troubleshooting.
Partial CDN adoption — only static assets on CDN — may require fetching asset URLs specifically rather than the HTML homepage.
Security and WAF implications
Major CDNs bundle web application firewalls and bot management. Knowing CDN presence explains why direct origin IP attacks bypass edge protection when origin IP leaks.
Bug bounty researchers note CDN to avoid reporting CDN IP addresses as origin misconfigurations without verifying direct origin exposure.
Performance troubleshooting
Cache status headers reveal HIT versus MISS — useful when debugging stale content or low cache ratios. High MISS rates suggest misconfigured cache keys or excessive cookie variation.
Compare CDN detection with HTTP/2 checker results to ensure modern protocols extend through the edge to clients.
Limitations of header-only detection
Custom CDN branding, regional white-label edges, or newly launched providers may lack signatures in our matcher. Unknown CDNs appear as undetected despite acceleration being present.
We perform a single fetch — redirect chains follow automatically but may terminate at a different host than you typed.
Safe URL fetching
URLs pass SSRF protection before fetch. Internal IP ranges and metadata endpoints are blocked. Only public HTTP and HTTPS targets are reachable.
Pairing with technology detection
Website technology detector scans HTML for frameworks while CDN detector focuses on delivery layer headers. Together they map full stack from edge to application.
When CDN detection changes
Cutover weekends and DNS TTL expirations shift responses from origin to edge. Re-run detection after infrastructure migrations to update documentation.
Frequently Asked Questions
Yes. VSPIC offers this CDN detector at no cost with no account required. Results load in real time.
We do not permanently store your queries on our servers. Some tools run entirely in your browser; others fetch public data for the request only.
Yes. Open the page in any modern phone or tablet browser. Results work on Wi‑Fi and mobile data.
We normalize to HTTPS when possible. Plain HTTP may redirect; final headers come from the response chain.
Some configurations hide vendor headers at origin or use lesser-known providers not in our signature list.
When the CDN sends cache status headers such as cf-cache-status, they appear in the signals object.
Yes. Enter any public URL path; detection runs against that host's response headers.
No. This tool reads response headers only, not origin discovery.
Yes. Fetch follows redirects and analyzes final response headers.
Next step for your check
Continue with website technology detector on VSPIC.
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