Expect-CT Directives (3 total)
- enforce
- max-age
- report-uri
Expect-CT
HTTP response headerThe Expect-CT header allows sites to opt in to reporting and/or enforcement of Certificate Transparency requirements which prevents the use of misissued certificates for that site from going unnoticed
Header usage statistics
Expect-CT response header information and usage statistics.| Websites using header Expect-CT | 3,343,455 |
| Percentage of websites that use Expect-CT header | 6.23% |
| Total discovered header values | 4,675 |
| Header uses directives | Yes |
| Header values are unique or random | No |
| Most popular in the country | 
United States of America
|
Expect-CT Directives
Expect-CT directives value information and usage statistics| Directive | Share | Websites count | Unique Values |
|---|---|---|---|
| max-age | 36.37% | 1,216,156 | 65 |
| report-uri | 35.72% | 1,194,437 | 592 |
| enforce | 0.58% | 19,520 | 33 |
Connected technologies
Technologies that utilize the header
CloudFlare, category
Content Delivery Networks, total
3,535,854 websites
|
Distribution by websites popularity
Expect-CT detection in the top websites by popularity| Top 10k sites | 2,734 websites |
| Top 100k sites | 15,051 websites |
| Top 1m sites | 123,235 websites |
Websites utilizing Expect-CT
List of websites that use Expect-CT header| Domain | Country | Rank | Contacts |
|---|---|---|---|
|
|
United States of America
|
9 | |
|
|
United States of America
|
13 | |
|
|
United States of America
|
23 | |
|
|
United States of America
|
33 | |
|
|
United States of America
|
34 | |
|
|
United States of America
|
37 |
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Geographical Distribution
Header usage distribution by websites across the globe.Common header values
List of top common Expect-CT header values| Header value | Value prevalence |
|---|---|
| max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct" | 97.57% |
| max-age=7776000, enforce | 0.62% |
| max-age=0 | 0.29% |
| max-age=86400 | 0.13% |
| enforce, max-age=21600 | 0.13% |
| max-age=31536000, report-uri="http://csp.yahoo.com/beacon/csp?src=yahoocom-expect-ct-report-only" | 0.10% |
| enforce, max-age=86400, report-uri="https://hpage-report.uriports.com/reports/enforce" | 0.06% |
| max-age=86400, enforce | 0.04% |
| enforce, max-age=31536000 | 0.04% |
| enforce, max-age=3600 | 0.04% |
| max-age=0, report-uri="/report-expect-ct-violation" | 0.04% |
| enforce; max-age=2592000; | 0.04% |
| enforce; max-age=30 | 0.03% |
| report-uri="https://web-security-reports.services.atlassian.com/expect-ct-report/global-proxy", enforce, max-age=86400 | 0.03% |
| enforce, max-age=30 | 0.03% |
| enforce, max-age=300 | 0.03% |
| max-age=31536000, enforce | 0.02% |
| max-age=300, report-uri="https://report.enjin.com/expect-ct" | 0.02% |
| enforce,max-age=86400 | 0.02% |
| max-age=31536000 | 0.02% |