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
14-07-2016	22 159	3.85%	6	575 599
21-08-2016	29 104	4.64%	5	626 616
25-09-2016	23 880	4.43%	5	539 594
30-09-2016	39 072	5.80%	5	674 019
03-12-2016	59 547	8.01%	3	743 081
22-01-2017	67 413	9.70%	3	695 015
14-05-2017	84 129	13.87%	2	606 661
30-11-2017	128 435	19.14%	2	670 882

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
14-07-2016	2 787	0.48%	24	579 564
21-08-2016	2 767	0.48%	24	566 076
25-09-2016	1 798	0.39%	24	465 238
30-09-2016	5 092	0.81%	18	630 310
03-12-2016	8 417	1.27%	18	663 072
22-01-2016	10 200	1.78%	12	574 194
14-05-2017	11 187	2.13%	10	524 491
30-11-2017	15 059	2.78%	9	540 797

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.