Which certificate authority issues the most certificates?

Let's Encrypt secures the most domains of any CA: 125,933,144 active domains, 53.00% of all domains we can attribute to an issuer as of October 16, 2026, ahead of GoDaddy at 26.65%.

How is certificate authority market share measured here?

Every domain carries the issuer of the most recent certificate we observed for it in the Certificate Transparency logs. We count the active domains attributed to each CA once a day. That is current market share of live domains - not the number of certificates a CA has ever issued, and not counting the many certificates a single domain accumulates over its life.

Why are several intermediate CAs grouped under one name?

Authorities sign from a rotating set of intermediates - Let’s Encrypt uses R10, R11 and others; DigiCert has dozens. The CT logs name the intermediate, so we store per-intermediate counts and roll them up to the parent authority here. Each CA page lists its intermediates and their individual counts.

Why is the active count lower than the total number of domains you hold?

We retain records for domains that have since lapsed. The active count is the current, live population; the raw record count includes domains we have seen at some point but that are no longer in a zone file or covered by a recent certificate.

~/dnsniffer/issuers·ranked by domains secured

▸ Certificate authority market share

Every certificate authority ranked by the number of active domains whose current TLS certificate it issued, measured October 16, 2026. Let's Encrypt leads with 125,933,144 domains - 53.00% of the 237,590,333 domains we can attribute to an issuer.

fastest growing →fastest declining →TLD rankings → download the data

# market share · 30-day trend · 90-day sparkline

CAs by domains secured

Certificate authorities ranked by active domains secured as of October 16, 2026, with market share, 30-day change and a 90-day trend line.
#	issuer	domains secured	share	30d	90d trend	intermediates
1	▸ Let's Encrypt	125,933,144	53.00%	▲ +2.95%		6
2	▸ GoDaddy	63,310,460	26.65%	▲ +4.73%		4
3	▸ Google Trust Services	23,859,557	10.04%	▲ +3.46%		7
4	▸ DigiCert	9,537,609	4.01%	▲ +2.19%		79
5	▸ Sectigo	5,613,712	2.36%	▲ +5.48%		12
6	▸ Amazon	2,567,610	1.08%	▲ +4.75%		26
7	▸ ZeroSSL	1,882,388	0.79%	▲ +0.51%		2
8	▸ Actalis	1,050,855	0.44%	▼ -0.83%		7
9	▸ TrustAsia Technologies	952,328	0.40%	▲ +9.83%		18
10	▸ GlobalSign	686,594	0.29%	▲ +10.55%		58
11	▸ SSL.com	667,861	0.28%	▲ +37.80%		17
12	▸ Starfield Technologies	280,398	0.12%	▲ +53.17%		4
13	▸ Certum	159,953	0.07%	▲ +7.80%		4
14	▸ home.pl	143,401	0.06%	▼ -2.41%		3
15	▸ cPanel	64,704	0.03%	▲ +34.24%		5
16	▸ Certainly	60,568	0.03%	▲ +2.57%		1
17	▸ home.pl sp. z o.o	57,156	0.02%	▲ +102.23%		2
18	▸ Japan Registry Services	52,842	0.02%	▲ +12.89%		2
19	▸ Proofpoint	50,394	0.02%	▲ +10.41%		1
20	▸ GoGetSSL	49,472	0.02%	▲ +13.15%		6
21	▸ cyber_Folks	45,965	0.02%	▲ +12.88%		2
22	▸ WoTrus CA	43,359	0.02%	▲ +9.64%		9
23	▸ Network Solutions	43,107	0.02%	▼ -19.08%		6
24	▸ Xin Net Technology	42,021	0.02%	▲ +11.99%		6
25	▸ Unizeto Technologies	24,541	0.01%	▲ +26.12%		2
26	▸ èéæºæ§å®å¨ç§ææéå¬å¸	23,368	<0.01%	▼ -6.86%		24
27	▸ sslTrus	22,444	<0.01%	▲ +20.84%		9
28	▸ Japan Registry Services Co	21,142	<0.01%	▼ -18.22%		2
29	▸ Soluciones Corporativas IP, SL	19,526	<0.01%	▲ +9.62%		1
30	▸ Beijing Xinchacha Credit Management Co	18,548	<0.01%	▼ -2.47%		6
31	▸ Universitaet Augsburg	18,089	<0.01%	▼ -0.48%		1
32	▸ Gandi	17,029	<0.01%	▲ +10.38%		5
33	▸ Shoper	16,903	<0.01%	▲ +12.74%		1
34	▸ PerfectSSL	16,867	<0.01%	▲ +8.32%		1
35	▸ Trust Provider	12,931	<0.01%	▲ +16.62%		2
36	▸ CloudSecure	11,739	<0.01%	▲ +5.40%		6
37	▸ JoySSL	10,725	<0.01%	▲ +12.94%		8
38	▸ Cybertrust Japan Co	10,007	<0.01%	▼ -12.69%		2
39	▸ nazwa.pl	9,881	<0.01%	▲ +92.91%		1
40	▸ DNSPod	9,350	<0.01%	▲ +9.01%		6
41	▸ Henan Fierce Fire Network Technology	8,887	<0.01%	▲ +17.06%		2
42	▸ LH.pl Sp. z o.o	8,744	<0.01%	▲ +25.09%		2
43	▸ Nijimo	8,080	<0.01%	▲ +1.35%		3
44	▸ SSL2BUY EMEA	5,946	<0.01%	▲ +15.37%		3
45	▸ Corporation Service Company	4,803	<0.01%	▲ +10.67%		4
46	▸ SwissSign	4,601	<0.01%	▼ -0.90%		6
47	▸ nazwa.pl sp. z o.o	4,490	<0.01%	▲ +72.36%		1
48	▸ F5	4,477	<0.01%	▲ +87.32%		1
49	▸ The USERTRUST Network	4,397	<0.01%	▲ +17.03%		2
50	▸ UniTrust	4,185	<0.01%	▲ +6.98%		5
51	▸ Shanghai Huandu Info Tech	4,080	<0.01%	▲ +13.78%		4
52	▸ Alpiro s.r.o	3,920	<0.01%	▲ +10.05%		6
53	▸ ENEDIS SA	3,857	<0.01%	▲ +16.31%		1
54	▸ Isimtescil Bilisim A.S	3,836	<0.01%	▼ -24.65%		1
55	▸ TAIWAN-CA	3,624	<0.01%	▲ +0.28%		4
56	▸ The Trustico Group	3,580	<0.01%	▲ +13.61%		5
57	▸ Microsoft	3,536	<0.01%	▲ +2.29%		9
58	▸ BAWAG Group	3,483	<0.01%	▲ +13.67%		1
59	▸ Beijing Xinchacha Credit Management	3,440	<0.01%	▲ +3,559.57%		4
60	▸ CDW	3,433	<0.01%	▲ +17.81%		1
61	▸ EUNETIC	3,279	<0.01%	▲ +6.32%	-	5
62	▸ Certera	3,179	<0.01%	▲ +8.68%	-	2
63	▸ iTrusChina Co	2,892	<0.01%	▲ +3.21%	-	2
64	▸ eMudhra Technologies	2,804	<0.01%	▲ +16.64%	-	6
65	▸ Aliyun Computing Co	2,798	<0.01%	▲ +12.28%	-	1
66	▸ GeoSSL	2,686	<0.01%	▲ +11.78%	-	3
67	▸ TuringSign Global SA	2,503	<0.01%	▲ +5.75%	-	2
68	▸ China Financial Certification Authority	2,477	<0.01%	▲ +3.12%	-	8
69	▸ SECOM Trust Systems	2,446	<0.01%	▼ -3.51%	-	7
70	▸ Cloudflare	2,420	<0.01%	▼ -12.00%	-	2
71	▸ Cisco Systems	2,406	<0.01%	▲ +4.34%	-	1
72	▸ Soluciones Corporativas IP	2,140	<0.01%	▲ +33.25%	-	1
73	▸ Shanghai Electronic Certification Authority	1,977	<0.01%	▲ +1.44%	-	2
74	▸ D-Trust	1,960	<0.01%	▲ +18.07%	-	8
75	▸ Entrust	1,946	<0.01%	▲ +7.16%	-	4
76	▸ SECOM Trust Systems Co	1,910	<0.01%	▲ +28.79%	-	2
77	▸ GEANT Vereniging	1,802	<0.01%	▲ +157.80%	-	3
78	▸ Internet2	1,748	<0.01%	▲ +26.12%	-	6
79	▸ DigiCert Ireland	1,702	<0.01%	▼ -9.66%	-	5
80	▸ Verokey	1,618	<0.01%	▲ +9.47%	-	4
81	▸ Apple	1,469	<0.01%	▲ +0.34%	-	7
82	▸ Deutsche Telekom Security	1,440	<0.01%	▲ +6.82%	-	9
83	▸ Genious Communications	1,438	<0.01%	▲ +9.69%	-	3
84	▸ Alibaba Cloud Computing	1,413	<0.01%	▼ -2.28%	-	3
85	▸ AutonTrust PTE	1,281	<0.01%	▲ +48.78%	-	1
86	▸ Vitalwerks Internet Solutions	1,174	<0.01%	▲ +6.53%	-	2
87	▸ NAVER Cloud Trust Services	1,113	<0.01%	▲ +29.27%	-	2
88	▸ Key-Systems	1,040	<0.01%	▲ +27.76%	-	1
89	▸ Buypass AS-983163327	1,026	<0.01%	▲ +0.00%	-	3
90	▸ Hongkong Post	901	<0.01%	▲ +1.01%	-	2
91	▸ Telia Company	893	<0.01%	▲ +6.31%	-	2
92	▸ Zhejiang Huluwa Digital Certification	881	<0.01%	▲ +47.57%	-	3
93	▸ Deutsche Post	813	<0.01%	▲ +31.98%	-	2
94	▸ Comodo Japan	744	<0.01%	▲ +0.13%	-	1
95	▸ Hao Quang Viet Software Company	737	<0.01%	▲ +1.24%	-	3
96	▸ CentralNic Luxembourg SÃ rl	734	<0.01%	▼ -10.92%	-	1
97	▸ Leocert	719	<0.01%	▼ -69.47%	-	1
98	▸ TBS INTERNET	718	<0.01%	▲ +13.43%	-	2
99	▸ InCommon	670	<0.01%	▼ -13.99%	-	1
100	▸ Microsec	534	<0.01%	▲ +22.48%	-	6
101	▸ Global Digital Cybersecurity Authority Co	532	<0.01%	▼ -5.51%	-	4
102	▸ Hellenic Academic and Research Institutions CA	502	<0.01%	▼ -15.77%	-	3
103	▸ Chunghwa Telecom	491	<0.01%	▼ -2.19%	-	1
104	▸ Telia Finland Oyj	388	<0.01%	▼ -1.27%	-	2
105	▸ iTrust	355	<0.01%	▲ +10.59%	-	3
106	▸ iTrusChina	329	<0.01%	▲ +16,350.00%	-	5
107	▸ Izenpe	296	<0.01%	▲ +8.42%	-	4
108	▸ Global Digital Cybersecurity Authority	279	<0.01%	▲ +28.57%	-	6
109	▸ Nijimo K.K	259	<0.01%	▲ +4.44%	-	3
110	▸ FNMT-RCM	247	<0.01%	▲ +216.67%	-	1
111	▸ QuoVadis Trustlink	215	<0.01%	▼ -32.18%	-	4
112	▸ Zhejiang Huluwa Digital Certification Co	213	<0.01%	▼ -22.83%	-	2
113	▸ CERTSIGN SA	205	<0.01%	▲ +17.14%	-	1
114	▸ IdenTrust	205	<0.01%	▲ +3.54%	-	3
115	▸ VELO SPÃÅKA Z OGRANICZONÄ ODPOWIEDZIALNOÅCIÄ	201	<0.01%	▲ +3.08%	-	1
116	▸ WISeKey	193	<0.01%	▲ +5.46%	-	3
117	▸ Sectigo (Europe) SL	188	<0.01%	▲ +3.87%	-	2
118	▸ ISTEC	181	<0.01%	▼ -23.63%	-	1
119	▸ EnVers Group SIA	176	<0.01%	▲ +12.10%	-	1
120	▸ Turing Crypto	171	<0.01%	▼ -8.56%	-	1
121	▸ NYA LABS	143	<0.01%	▲ +10.85%	-	1
122	▸ NETLOCK	138	<0.01%	▲ +142.11%	-	2
123	▸ CertCloud Pte	124	<0.01%	-	-	1
124	▸ NAVER BUSINESS PLATFORM	120	<0.01%	▲ +15.38%	-	1
125	▸ Valid Certificadora Digital LTDA	117	<0.01%	▲ +12.50%	-	5
126	▸ DHIMYOTIS	117	<0.01%	▲ +12.50%	-	2
127	▸ Abitab	114	<0.01%	▼ -24.50%	-	2
128	▸ E-TUGRA EBG BILISIM TEKNOLOJILERI VE HIZMETLERI ANONIM SIRKETI	113	<0.01%	▼ -24.16%	-	2
129	▸ United SSL Deutschland	105	<0.01%	▼ -5.41%	-	1
130	▸ Domain The Net Technologies	103	<0.01%	▼ -16.94%	-	1
131	▸ Firmaprofesional	101	<0.01%	▼ -55.51%	-	2
132	▸ Viking Cloud	99	<0.01%	▼ -4.81%	-	7
133	▸ Rede Nacional de Ensino e Pesquisa - RNP	98	<0.01%	▲ +30.67%	-	2
134	▸ TrustSign Certificadora Dig. & Solucoes Seguranca da Inf. Ltda	95	<0.01%	▲ +13.10%	-	1
135	▸ Krajowa Izba Rozliczeniowa	92	<0.01%	▼ -22.69%	-	3
136	▸ Zhejiang Xinya Network Technology	91	<0.01%	▲ +65.45%	-	3
137	▸ Atos	83	<0.01%	▲ +9.21%	-	2
138	▸ Wells Fargo & Company	82	<0.01%	▲ +5.13%	-	1
139	▸ TI Trust Technologies S.R.L	81	<0.01%	▼ -16.49%	-	2
140	▸ ÄeskÃ¡ poÅ¡ta	81	<0.01%	▲ +37.29%	-	1
141	▸ Gehirn	80	<0.01%	▼ -2.44%	-	5
142	▸ Shenzhen Digital Certificate Authority Center Co	80	<0.01%	▲ +2.56%	-	2
143	▸ Shaanxi Digital Certificate Authority	79	<0.01%	▲ +14.49%	-	1
144	▸ Zhejiang Xinya Network Technology Co	77	<0.01%	▼ -11.49%	-	3
145	▸ Certigna	77	<0.01%	▼ -2.53%	-	4
146	▸ MarketWare - SoluÃ§Ãµes para Mercados Digitais	74	<0.01%	▲ +17.46%	-	4
147	▸ TUBITAK Kamu Sertifikasyon Merkezi	72	<0.01%	▲ +10.77%	-	2
148	▸ N.V. Nederlandse Spoorwegen	71	<0.01%	▲ +7.58%	-	1
149	▸ Chunghwa Telecom Co	69	<0.01%	▲ +305.88%	-	1
150	▸ Liberty Mutual Group	69	<0.01%	▼ -46.51%	-	1
151	▸ SOLUTI - SOLUCOES EM NEGOCIOS INTELIGENTES S/A	68	<0.01%	▲ +11.48%	-	8
152	▸ RTM Designs	67	<0.01%	▼ -6.94%	-	1
153	▸ Disig a.s	64	<0.01%	▲ +1.59%	-	2
154	▸ E-SAFER CONSULTORIA EM TECNOLOGIA DA INFORMACAO LTDA	64	<0.01%	▼ -7.25%	-	3
155	▸ Digi- ja vaestotietovirasto CA	63	<0.01%	▲ +28.57%	-	2
156	▸ LATSSL (Intradigital Soluciones Tecnologicas S. de R.L. de C.V)	62	<0.01%	▼ -4.62%	-	2
157	▸ Telecom Italia Trust Technologies S.R.L	61	<0.01%	▲ +38.64%	-	4
158	▸ swissns	60	<0.01%	▼ -14.29%	-	1
159	▸ Ziwit	59	<0.01%	▲ +7.27%	-	5
160	▸ CerSign Technology	59	<0.01%	▲ +293.33%	-	2
161	▸ Anhui Spider Information Technology Co	53	<0.01%	▲ +8.16%	-	1
162	▸ China Telecom Cybersecurity Technology	52	<0.01%	▲ +1.96%	-	2
163	▸ European Organisation for the Safety of Air Navigation	45	<0.01%	▼ -55.45%	-	1
164	▸ Agence Nationale de Certification Electronique	41	<0.01%	▲ +20.59%	-	1
165	▸ Redis	37	<0.01%	▼ -11.90%	-	2
166	▸ QuoVadis	35	<0.01%	▲ +250.00%	-	2
167	▸ Financijska agencija	34	<0.01%	▲ +6.25%	-	2
168	▸ Abion	33	<0.01%	▲ +153.85%	-	1
169	▸ One Sign Pte	32	<0.01%	▲ +10.34%	-	2
170	▸ National Agency for Information and Communication Technologies	31	<0.01%	▼ -3.13%	-	1
171	▸ KEYSEC LTDA	31	<0.01%	▲ +14.81%	-	1
172	▸ Government of Korea	27	<0.01%	▲ +92.86%	-	2
173	▸ ACCV	25	<0.01%	▲ +733.33%	-	1
174	▸ Baidu	24	<0.01%	▲ +20.00%	-	3
175	▸ PKI(Chongqing)	24	<0.01%	▲ +0.00%	-	1
176	▸ Centre Testing International Group Co	24	<0.01%	▲ +0.00%	-	3
177	▸ PrvnÃ certifikaÄnÃ autorita	20	<0.01%	▲ +25.00%	-	2
178	▸ FIX PAY ADM DE PAGAMENTOS LTDA	19	<0.01%	▲ +26.67%	-	1
179	▸ Deutsche Kreditbank	15	<0.01%	▲ +0.00%	-	1
180	▸ Site Blindado	14	<0.01%	▼ -33.33%	-	1
181	▸ McAfee	13	<0.01%	▼ -18.75%	-	1
182	▸ CrowdStrike	12	<0.01%	▲ +9.09%	-	5
183	▸ Sooma.com Web Services Lda	12	<0.01%	▲ +9.09%	-	2
184	▸ Meta Platforms	12	<0.01%	▲ +71.43%	-	1
185	▸ eMudhra	12	<0.01%	▲ +9.09%	-	3
186	▸ ZoTrus Technology	11	<0.01%	▲ +450.00%	-	3
187	▸ SERPRO	11	<0.01%	▲ +10.00%	-	1
188	▸ A-Trust	11	<0.01%	▲ +10.00%	-	1
189	▸ INSTITUTE FOR DEVELOPMENT AND RESEARCH IN BANKING TECHNOLOGY	10	<0.01%	▲ +0.00%	-	1
190	▸ MarketWare - SoluÃ§Ãµes para Mercados Digitais, Lda	10	<0.01%	▲ +100.00%	-	1
191	▸ SERVICO FEDERAL DE PROCESSAMENTO DE DADOS (SERPRO)	10	<0.01%	▲ +0.00%	-	1
192	▸ Open Access Technology International	9	<0.01%	▲ +0.00%	-	2
193	▸ K Software	9	<0.01%	▲ +80.00%	-	1
194	▸ Hellenic Academic and Research Institutions	9	<0.01%	▼ -18.18%	-	1
195	▸ cnWebTrust	8	<0.01%	▲ +0.00%	-	3
196	▸ Greek Universities Network (GUnet)	7	<0.01%	▼ -41.67%	-	2
197	▸ Guizhou Electronic Certification Technology Co	7	<0.01%	▲ +16.67%	-	2
198	▸ Cybertrust Japan	6	<0.01%	▲ +0.00%	-	2
199	▸ AffirmTrust	6	<0.01%	▲ +200.00%	-	1
200	▸ Ministerio da Defesa	5	<0.01%	▲ +0.00%	-	2
201	▸ Beijing Zhongyu Yongxin Network Technology	5	<0.01%	▲ +400.00%	-	3
202	▸ Agenzia per l'Italia Digitale	4	<0.01%	▲ +100.00%	-	2
203	▸ EDICOM CAPITAL SL	4	<0.01%	▲ +33.33%	-	1
204	▸ Zhongxiong Century Credit Co	3	<0.01%	▲ +0.00%	-	2
205	▸ CSI Piemonte Consorzio per il Sistema informativo	3	<0.01%	▲ +0.00%	-	1
206	▸ CERTDATA SSL DV CA [Run by the Issuer]	3	<0.01%	▲ +0.00%	-	1
207	▸ Banco Votorantim	3	<0.01%	▲ +0.00%	-	1
208	▸ Shenzhen Digital Certificate Authority Center	3	<0.01%	-	-	2
209	▸ KICA	2	<0.01%	-	-	2
210	▸ BitCert	2	<0.01%	▲ +100.00%	-	1
211	▸ TRUSTCERT TECNOLOGIA E SERVICOS EM CERTIFICACAO DIGITAL LTDA	2	<0.01%	-	-	2
212	▸ DOCK INSTITUICAO DE PAGAMENTO	2	<0.01%	▲ +100.00%	-	1
213	▸ Kingnet Information Technology Co	2	<0.01%	-	-	1
214	▸ ICP-Brasil	2	<0.01%	▼ -50.00%	-	1
215	▸ Prodrive Technologies	1	<0.01%	▲ +0.00%	-	1
216	▸ Wuhu Huawei Cloud Computing Technology	1	<0.01%	▲ +0.00%	-	1
217	▸ Ministry of the Interior and Safety	1	<0.01%	▲ +0.00%	-	1
218	▸ 3CX	1	<0.01%	▲ +0.00%	-	1
219	▸ A-Trust Ges. f. Sicherheitssysteme im elektr. Datenverkehr	1	<0.01%	▼ -50.00%	-	1
220	▸ Google UK	1	<0.01%	▲ +0.00%	-	1
221	▸ Staclar	1	<0.01%	▼ -50.00%	-	1
222	▸ BEIJING CERTIFICATE AUTHORITY	1	<0.01%	▲ +0.00%	-	1
223	▸ TK Elevator	1	<0.01%	▲ +0.00%	-	1
224	▸ e-commerce monitoring	1	<0.01%	▲ +0.00%	-	1
225	▸ Shenzhen Yamu Security Technology Co	1	<0.01%	▲ +0.00%	-	1

# Share is of the 237,590,333 active domains we can attribute to an issuer, not of the whole DNS - domains with no certificate we have seen are excluded entirely. Each domain counts once, under the issuer of its most recent certificate, so this is current market share rather than lifetime certificates issued. Percentage trends on the leaderboards ignore CAs under 1,000 active domains.

# faq

? Which certificate authority issues the most certificates?: Let's Encrypt secures the most domains of any CA: 125,933,144 active domains, 53.00% of all domains we can attribute to an issuer as of October 16, 2026, ahead of GoDaddy at 26.65%.
? How is certificate authority market share measured here?: Every domain carries the issuer of the most recent certificate we observed for it in the Certificate Transparency logs. We count the active domains attributed to each CA once a day. That is current market share of live domains - not the number of certificates a CA has ever issued, and not counting the many certificates a single domain accumulates over its life.
? Why are several intermediate CAs grouped under one name?: Authorities sign from a rotating set of intermediates - Let’s Encrypt uses R10, R11 and others; DigiCert has dozens. The CT logs name the intermediate, so we store per-intermediate counts and roll them up to the parent authority here. Each CA page lists its intermediates and their individual counts.
? Why is the active count lower than the total number of domains you hold?: We retain records for domains that have since lapsed. The active count is the current, live population; the raw record count includes domains we have seen at some point but that are no longer in a zone file or covered by a recent certificate.