DNS
THE CERTIFICATE BEHIND THE CONNECTION

TLS certificate checker.

Inspect SSL/TLS certificates for any public domain or subdomain.

Checks HTTPS on port 443, including subject alternative names, validity dates and the presented chain.

SSL certificate

TLSv1.3

protonmail.com · 185.70.42.12:443

Verified

Certificate chain, hostname and dates verified using this server’s CA store.

Subject
CN=protonmail.com
Issuer
C=US O=Let's Encrypt CN=YR2
Valid from
2026-10-19T13:13:16+00:00
Expires
2027-01-17T13:13:15+00:00
Days remaining
69
Serial (hex)
060913AFEF9B8236BC6EF7938DEFC060B556
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

DNS:account.protonvpn.com, DNS:app.protonmail.ch, DNS:beta.protonmail.com, DNS:mail.protonmail.com, DNS:old.protonmail.com, DNS:pm.me, DNS:protonmail.ch, DNS:protonmail.com, DNS:protonvpn.com, DNS:secure.protonmail.com

SHA-256 fingerprint

19:2D:EC:CA:18:56:F5:90:1A:AE:1F:C6:16:61:3F:ED:65:A0:B1:D1:C2:02:4E:C3:EB:61:16:A6:98:FF:73:64
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
32:BB:B9:1E:63:A0:0A:CE:9B:B1:3E:F3:FD:5D:A7:EA:9B:EA:34:40
authorityKeyIdentifier
40:15:2D:26:79:ED:32:20:9E:DF:9A:72:1D:D6:32:1F:81:0C:81:0C
authorityInfoAccess
CA Issuers - URI:http://yr2.i.lencr.org/
subjectAltName
DNS:account.protonvpn.com, DNS:app.protonmail.ch, DNS:beta.protonmail.com, DNS:mail.protonmail.com, DNS:old.protonmail.com, DNS:pm.me, DNS:protonmail.ch, DNS:protonmail.com, DNS:protonvpn.com, DNS:secure.protonmail.com
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr2.c.lencr.org/87.crl
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 4C:63:DC:98:E5:9C:1D:AB:88:F6:1E:8A:3D:DE:AE:8F: AB:44:A3:37:7B:5F:9B:94:C3:FB:A1:9C:FC:C1:BE:26 Timestamp : Oct 19 14:11:46.634 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:D2:C9:E4:C6:81:63:A8:9A:AA:5B:69: 8D:8C:8B:5B:01:57:80:A4:FA:35:6F:F7:13:19:48:53: 01:41:DC:4A:30:02:21:00:DF:0A:D8:B1:D6:C1:61:44: 91:C7:45:14:B9:2D:60:EE:F0:D5:4F:43:A9:D1:6F:5E: 77:A6:81:D7:45:6F:B3:FA Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 8E:CA:47:0B:AC:DE:6A:F3:A2:06:B0:A4:7A:84:B7:46: FE:1F:C6:BF:95:3E:25:E6:9B:4E:E4:02:48:F3:C6:E8 Timestamp : Oct 19 14:11:46.724 2026 GMT Extensions: 00:00:05:00:28:56:CB:1B Signature : ecdsa-with-SHA256 30:44:02:20:49:9C:0B:88:FB:7C:29:86:BB:E4:29:3F: 35:A6:52:F7:70:C3:34:C9:B5:88:7D:A2:50:37:09:25: 09:7E:66:CA:02:20:72:AC:AF:45:55:F8:D2:5C:AE:B9: 05:51:F0:F8:30:FB:23:87:F0:80:76:08:31:5E:46:1E: A9:20:44:AA:44:9F
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-11-09T08:45:49+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=US O=Let's Encrypt CN=YR2
Issuer
C=US O=ISRG CN=Root YR
Valid from
2025-09-03T00:00:00+00:00
Expires
2028-09-02T23:59:59+00:00
Days remaining
663
Serial (hex)
4EBD24947E24D394802D84A52FD5B319
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

23:8B:85:A0:09:9C:65:B9:70:47:7D:57:24:F1:A1:D4:75:CE:50:58:CF:FE:4E:FA:87:33:89:9B:DB:86:3C:47
Certificate extensions & PEM
keyUsage
Digital Signature, Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:TRUE, pathlen:0
subjectKeyIdentifier
40:15:2D:26:79:ED:32:20:9E:DF:9A:72:1D:D6:32:1F:81:0C:81:0C
authorityKeyIdentifier
DE:E7:5B:60:D0:22:6D:40:28:7D:3F:0D:01:FE:A4:B5:52:B4:51:94
authorityInfoAccess
CA Issuers - URI:http://yr.i.lencr.org/
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr.c.lencr.org/ 
-----BEGIN CERTIFICATE-----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==
-----END CERTIFICATE-----

Chain certificate 2

Subject
C=US O=ISRG CN=Root YR
Issuer
C=US O=Internet Security Research Group CN=ISRG Root X1
Valid from
2026-05-13T00:00:00+00:00
Expires
2032-09-02T23:59:59+00:00
Days remaining
2124
Serial (hex)
F24B6D17F9D9AD7CB1C9FEA78782699F
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

07:26:39:D0:B1:40:D5:BF:FA:E1:6A:D9:C3:F6:CC:60:86:04:06:21:F5:1E:E6:1A:6D:46:A8:91:5C:07:CF:76
Certificate extensions & PEM
keyUsage
Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:TRUE
subjectKeyIdentifier
DE:E7:5B:60:D0:22:6D:40:28:7D:3F:0D:01:FE:A4:B5:52:B4:51:94
authorityKeyIdentifier
79:B4:59:E6:7B:B6:E5:E4:01:73:80:08:88:C8:1A:58:F6:E9:9B:6E
authorityInfoAccess
CA Issuers - URI:http://x1.i.lencr.org/
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://x1.c.lencr.org/ 
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

One endpoint on port 443. Server-presented chain; no revocation, OCSP, CT or full TLS security scan.

View certificate JSON

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