HTTP response header

The CF-RAY response header is a unique ID from CloudFlare and indicates that the resource was served through CloudFlare. The CF-Cache-Status response header indicates specifically if the file was from the cache or not. If the value of CF-Cache-Status is HIT then that resource was served from CloudFlare's cache

Header usage statistics

CF-RAY response header information and usage statistics.

Websites using header CF-RAY 6,845,865
Percentage of websites that use CF-RAY header 6.91%
Total discovered header values 10,001
Header uses directives No
Header values are unique or random No
Most popular in the country United States of America

Connected technologies

Technologies that utilize the header

CloudFlare, category Content Delivery Networks, total 6,856,289 websites

Distribution by websites popularity

CF-RAY detection in the top websites by popularity

Top 10k sites 1,841 websites
Top 100k sites 18,028 websites
Top 1m sites 170,185 websites

Websites utilizing CF-RAY

List of websites that use CF-RAY header

Domain Country Rank Contacts United States of America 14 United States of America 14 United States of America 20 United States of America 26 United States of America 27 United States of America 27
See full domain list
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Geographical Distribution

Header usage distribution by websites across the globe.

Common header values

List of top common CF-RAY header values

Header value Value prevalence
d13b3671cfa213d29caa52a2a69f0da3 0.00%
677802bada18255c-SJC 0.00%
3b1412753f475cc969c37231dd6eaea2 0.00%
689595d01f13050f-LAX 0.00%
6759e051db28027b-SJC 0.00%
67fb3a979849087d-SEA 0.00%
689e2e79b8e4c98d-SEA 0.00%
5319dfdccb34adec-SMF 0.00%
5698f562cccbed7f-SJC 0.00%
68beb47ddf932572-SJC 0.00%
678dbb79ce443b04-SJC 0.00%
68b1be592bd730e1-SEA 0.00%
67fa4d0528e702c8-SEA 0.00%
6116cb15ba3a212d-SJC 0.00%
681c0c87dd210935-SEA 0.00%
68b528598b13026c-SJC 0.00%
684f7db349a13672-LAX 0.00%
33ebf82af47b5078-LAX 0.00%
64070a4cac66552a-EWR 0.00%
6813693bafc5533d-LAX 0.00%