Let’s Encrypt/stats

Official stats

Let’s Encrypt provide some official statistics on the number of certificate that they deliver.

Ranking

Censys allows to get some statistics on the usage of Let’s Encrypt among the top 1 million websites.

Reports are build by querying the raw domain name. Some website are know to serve different certificates for the raw domain and the www prefix.

HTTPS

Date	Number	Percent	Rank	Total Number
26-03-2016*	7 590	1.08%	19	705 166
20-05-2016	12 823	1.5%	11	643 604
04-06-2016	15 367	2.3%	10	669 582
20-06-2016	15 969	2.41%	9	663 851

https://censys.io/domain/report?q=*&field=443.https.tls.certificate.parsed.issuer.organization.raw&max_buckets=

*: Old report based on intermediate certificate name. This affect rank as some authorities have multiple intermediates.

SMTP

Date	Number	Percent	Rank	Total Number
26-03-2016*	926	0.15%	50	623 943
20-05-2016	1 367	0.24%	39	581 296
04-06-2016	1 662	0.27%	32	612 866
20-06-2016	1 716	0.29%	30	599 019

https://censys.io/domain/report?q=*&field=25.smtp.starttls.tls.certificate.parsed.issuer.organization.raw&max_buckets=

*: Old report based on intermediate certificate name. This affect rank as some authorities have multiple intermediates.