Open CDN detection tool

chatgpt.com CDN Detection: Possible Cloudflare Usage

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

Checked At: 8/29/2026, 5:50:52 PM

Likely using Cloudflare

Central detection matched a public CDN fingerprint, but distributed real-probe cross-checking is not complete.

Public-data detection has not been cross-checked by real probes in multiple regions.

Source legacy_rule_catalog · version c22ce5e8c2df

chatgpt.comHTTP Status 403 8/29/2026, 5:50:52 PM

Overall Confidence

45%Evidence strength

Calculated from the independent evidence matched now

Node Distribution

Current snapshot
Cloudflare 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: 8/29/2026, 5:50:52 PM
05:50:52 PM
HTTP
header: cf-ray
Cloudflare

Strong

Score Explanation

Evidence strength breakdown

HEADER
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-172.64.155.209Cloudflare--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.
CloudflarePrimary candidate

Confidence 45%

header: cf-ray
View Cloudflare Performance Review

Methodology and limitations

Detection results are based on cross-assessment of public DNS, HTTP response headers, and ASN signals. The current public data assessment has not yet been cross-validated with real probes from multiple regions; confidence indicates evidence strength, not statistical accuracy.