Let’s Encrypt/stats

From wiki

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.