NEL

HTTP response header

Header usage statistics

NEL response header information and usage statistics.

Websites using header NEL 5,924,834
Percentage of websites that use NEL header 5.98%
Total discovered header values 310
Header uses directives No
Header values are unique or random No
Most popular in the country United States of America

Distribution by websites popularity

NEL detection in the top websites by popularity

Top 10k sites 924 websites
Top 100k sites 10,613 websites
Top 1m sites 126,432 websites

Websites utilizing NEL

List of websites that use NEL header

Domain Country Rank Contacts
hugedomains.com United States of America 14
www.hugedomains.com United States of America 14
cdnjs.cloudflare.com United States of America 20
cloudflare.com United States of America 27
www.cloudflare.com United States of America 27
use.fontawesome.com United States of America 30
See full domain list
Flat price per the report, subscription is not required.

Geographical Distribution

Header usage distribution by websites across the globe.






Common header values

List of top common NEL header values

Header value Value prevalence
{"success_fraction":0,"report_to":"cf-nel","max_age":604800} 83.89%
{"report_to":"network-errors","max_age":2592000,"success_fraction":0.0001} 14.58%
{"report_to":"network-errors","max_age":2592000,"failure_fraction":0.1} 1.09%
{"report_to":"cf-nel","max_age":604800} 0.13%
{ "report_to": "wm_nel", "max_age": 86400, "failure_fraction": 0.05, "success_fraction": 0.0} 0.06%
{"report_to":"default","max_age":31536000,"include_subdomains":true} 0.04%
{"report_to":"default","max_age":31557600,"include_subdomains":true,"success_fraction":0.005"} 0.04%
{"report_to":"default","max_age":31557600,"include_subdomains":true,"success_fraction":0.005} 0.03%
{"success_fraction":0,"report_to":"nel","max_age":3600} 0.02%
{"report_to":"default","max_age":2592000,"include_subdomains":true,"failure_fraction":1.0} 0.01%
{"report_to":"network-errors","max_age":86400,"success_fraction":0.001,"failure_fraction":1.0} 0.01%
{"report_to":"default","max_age":2592000,"include_subdomains":true} 0.01%
{"report_to":"network-errors","max_age":86400,"success_fraction":0.2,"failure_fraction":1.0} 0.01%
{"report_to":"default","max_age":31557600,"include_subdomains":true,"success_fraction":0.2} 0.01%
{"report_to":"network-errors","max_age":7200,"success_fraction":0.001,"failure_fraction":1.0} 0.01%
{"max_age":604800,"report_to":"default"} 0.01%
{"report_to":"default","max_age":604800} 0.01%
{"report_to": "default", "max_age": 86400, "failure_fraction": 0.1, "success_fraction": 0.0} 0.00%
{"report_to": "mediafirenel", "max_age": 86400, "include_subdomains": true, "failure_fraction": 0.01} 0.00%
{"report_to":"network-errors","max_age":1296000,"success_fraction":0.00066,"failure_fraction":1,"include_subdomains":true} 0.00%