Open CDN detection tool

www.fastly.com CDN Detection: Possible Fastly Usage

CNAME, HTTP header, and ASN signals indicate that www.fastly.com may be using Fastly, with 45% confidence. Review the evidence and latest check time.

Checked At: 9/2/2026, 4:22:40 AM

Likely using Fastly

This result is based on public DNS, HTTP, and network signals and may update with later observations.

www.fastly.comHTTP Status 200 9/2/2026, 4:22:40 AM

Overall Confidence

45%Evidence strength

Calculated from the independent evidence matched now

Node Distribution

Current snapshot
Fastly 45%

Detection Path

Complete · 5 stages

DNS Resolution
-

Complete · 6 addresses

CNAME Chain
-

Complete · 1 CNAME found

IP / ASN
-

Complete · 6 IPs, 4 ASNs

HTTP Response
-

Complete · response headers collected

Fingerprint Score
-

Complete · 4 evidence types

Evidence Timeline

Observed facts ordered by collection time

Checked At: 9/2/2026, 4:22:40 AM
04:22:40 AM
HTTP
header: x-served-by
Fastly

Strong

Score Explanation

Evidence strength breakdown

HTTP headers
45 / 100

Response header name and value matches

This score presents evidence strength, not statistical probability. A shared ASN or cloud network cannot confirm a CDN on its own.

Node and Routing Differences

Resolution results and access signals observed by region and carrier

Collected just now
RegionCarrierResolved IPCDN ProviderASNLocationTTLConfidenceTTFB
Central node-151.101.77.57Fastly--9s
45%
-
Node results vary by region, carrier and time1 nodes
Detection results are inferred from public DNS and HTTP signals. Confidence reflects the strength of the matched evidence and does not imply 100% certainty.
FastlyPrimary candidate

Confidence 45%

header: x-served-by
View Fastly Performance Review

Methodology and limitations

Identification results are based on cross-analysis of public DNS, HTTP response headers, and ASN signals; confidence indicates evidence strength, not statistical accuracy.