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

protonvpn.com · 185.159.159.140:443

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
2026-08-25T13:13:15+00:00
Expires
2026-11-23T13:13:14+00:00
Days remaining
61
Serial (hex)
055220BE9C0B615E685837B9AAC842FA585B
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

15:72:28:B8:20:E4:5A:30:37:4B:E5:45:E4:EE:AC:89:37:13:BE:CE:CB:AC:D9:69:C7:CE:44:FA:14:82:41:9F
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/92.crl
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : C8:A3:C4:7F:C7:B3:AD:B9:35:6B:01:3F:6A:7A:12:6D: E3:3A:4E:43:A5:C6:46:F9:97:AD:39:75:99:1D:CF:9A Timestamp : Aug 25 14:11:45.322 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:BB:7D:AC:40:3E:F3:95:D2:AE:7D:1C: 67:B5:A0:5F:98:C1:DA:9B:E8:64:B1:07:BC:52:85:3D: 6E:FF:62:0E:2D:02:20:71:28:44:3F:4C:DE:30:F0:2B: 92:54:1E:BF:99:BA:B8:08:74:FC:A0:B1:04:D3:26:A6: F9:30:52:CB:2E:10:02 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 26:E3:64:6E:58:69:21:23:BC:34:3F:47:24:35:9B:37: 92:CD:24:5A:88:D8:15:D3:93:33:FD:99:18:AB:47:23 Timestamp : Aug 25 14:11:43.818 2026 GMT Extensions: 00:00:05:00:39:01:18:85 Signature : ecdsa-with-SHA256 30:45:02:20:19:58:7F:C5:04:E8:AF:FD:08:00:17:71: 91:77:19:80:33:76:FE:15:D8:78:71:E8:24:CF:BE:62: C9:40:77:B8:02:21:00:D1:77:27:2A:C5:23:A8:8A:FB: 8A:70:79:E6:67:DC:DD:D5:83:F7:57:23:96:2C:DD:18: EF:4E:DB:EC:F6:C7:01
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-09-22T13:46:55+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
711
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
2172
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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