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▸ How many domains does Let's Encrypt secure?

125,847,875

active domains whose current TLS certificate was issued by Let's Encrypt, as of - 53.02% of all attributed domains.

# rank #1 of all CAs# all records held: 153,915,101# subdomains: 2,109# intermediates: 6# United States
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~/issuers/lets-encrypt/history·active domains
125,847,875
domains secured by Let's Encrypt on 2026-10-14 · ▲ +81,776,590 (+185.56%) since 2025-06-30
34.26M59.61M84.96M110.31M135.66M2025-06-30: 44,071,285 active2025-07-31: 82,910,721 active2025-08-31: 83,464,425 active2025-09-30: 83,473,361 active2025-10-31: 83,473,361 active2025-11-30: 83,473,361 active2025-12-31: 95,484,358 active2026-01-31: 102,295,468 active2026-02-28: 102,295,472 active2026-03-31: 102,295,472 active2026-04-30: 114,080,597 active2026-05-31: 118,538,677 active2026-06-30: 121,437,510 active2026-07-31: 124,222,649 active2026-08-31: 124,192,712 active2026-09-01: 123,247,964 active2026-09-02: 122,336,278 active2026-09-03: 121,882,722 active2026-09-04: 121,751,462 active2026-09-05: 121,589,622 active2026-09-06: 121,608,380 active2026-09-07: 121,665,035 active2026-09-08: 121,760,873 active2026-09-09: 121,845,216 active2026-09-10: 121,957,004 active2026-09-11: 122,011,578 active2026-09-12: 122,075,124 active2026-09-13: 122,128,341 active2026-09-14: 122,186,281 active2026-09-15: 122,263,952 active2026-09-16: 122,321,944 active2026-09-17: 122,427,112 active2026-09-18: 122,497,849 active2026-09-19: 122,570,550 active2026-09-20: 122,595,993 active2026-09-21: 122,627,258 active2026-09-22: 122,689,795 active2026-09-23: 122,767,877 active2026-09-24: 124,500,453 active2026-09-25: 124,552,512 active2026-09-26: 124,597,583 active2026-09-27: 124,645,816 active2026-09-28: 124,697,850 active2026-09-29: 124,744,685 active2026-09-30: 124,824,576 active2026-10-01: 124,897,364 active2026-10-02: 124,917,569 active2026-10-03: 124,950,022 active2026-10-04: 124,972,324 active2026-10-05: 125,019,171 active2026-10-06: 125,128,266 active2026-10-07: 125,254,150 active2026-10-08: 125,393,125 active2026-10-09: 125,500,602 active2026-10-10: 125,606,045 active2026-10-11: 125,653,361 active2026-10-12: 125,692,854 active2026-10-13: 125,765,530 active2026-10-14: 125,847,875 active2025-06-302026-10-14

# y-axis starts at 34.26M, not zero - domain counts move by fractions of a percent a day. Dashed segments are estimated: reconstructed from certificate first-seen dates before daily snapshots began, not measured on the day.

# change over time
30 days
▲ +3.00%
+3,661,594 domains
90 days
▲ +3.63%
+4,410,365 domains
1 year
▲ +50.76%
+42,374,514 domains
# intermediate CAs
Intermediate certificate authorities operating under Let's Encrypt, with the number of active domains each currently secures.
intermediatecountrydomains
YR1United States48,214,963
YR2United States48,208,767
R12United States12,416,162
R13United States12,415,607
R10-2,297,248
R11-2,295,128
# faq
? How many domains does Let's Encrypt secure?
Let's Encrypt is the certificate authority for 125,847,875 active domains as of October 14, 2026 - 53.02% of every domain DNSniffer can attribute to an issuer.
? Is Let's Encrypt gaining or losing market share?
The number of domains secured by Let's Encrypt has grown by 50.76% over the last year (+42,374,514 domains).
? Which intermediate CAs does Let's Encrypt sign from?
We have seen 6 intermediates under Let's Encrypt, the busiest being “YR1” with 48,214,963 domains. The full list, with per-intermediate counts, is on this page.
? Where does this number come from?
DNSniffer ingests Certificate Transparency logs continuously and records the issuer of the most recent certificate seen for each domain, then snapshots the per-issuer count once a day. It measures how much of the live web a CA currently secures, not how many certificates it has issued over its lifetime.
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