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

TLSv1.2

mail.zexotek.de · 193.107.145.2:443

Unverified
Certificate verification failed. These are unverified certificate details presented by the server. SSL operation failed with code 1. OpenSSL Error messages: error:0A000086:SSL routines::certificate verify failed

Certificate verification failed

Subject
CN=server3.zexotek-server.de
Issuer
C=GB O=Sectigo Limited CN=Sectigo Public Server Authentication CA DV R36
Valid from
2026-01-25T00:00:00+00:00
Expires
2027-02-19T23:59:59+00:00
Days remaining
105
Serial (hex)
3D01A2A3DD72B0B2A89CB1386C170115
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

DNS:server3.zexotek-server.de, DNS:www.server3.zexotek-server.de

SHA-256 fingerprint

DD:55:C7:7D:78:9B:85:BA:17:41:D6:C4:40:C9:2E:94:15:97:BE:59:F6:41:9C:76:BE:97:2B:B1:9A:9A:57:82
Certificate extensions & PEM
authorityKeyIdentifier
68:C0:12:16:18:0E:AF:CE:F6:87:A6:32:57:A3:46:51:5D:CB:07:27
subjectKeyIdentifier
CC:F7:51:72:D9:5C:69:3C:D5:40:3C:19:3E:E8:8F:95:D4:C3:3E:EE
keyUsage
Digital Signature, Key Encipherment
basicConstraints
CA:FALSE
extendedKeyUsage
TLS Web Server Authentication
certificatePolicies
Policy: 1.3.6.1.4.1.6449.1.2.2.7 CPS: https://sectigo.com/CPS Policy: 2.23.140.1.2.1
authorityInfoAccess
CA Issuers - URI:http://crt.sectigo.com/SectigoPublicServerAuthenticationCADVR36.crt OCSP - URI:http://ocsp.sectigo.com
subjectAltName
DNS:server3.zexotek-server.de, DNS:www.server3.zexotek-server.de
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 1C:9F:68:2C:E9:FA:F0:45:69:50:F8:1B:96:8A:87:DD: DB:32:10:D8:4C:E6:C8:B2:E3:82:52:4A:C4:CF:59:9F Timestamp : Jan 25 08:39:10.801 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:DE:39:FC:F1:1D:39:7D:D0:E5:0F:82: 78:FD:3D:D7:8A:D0:94:A9:2B:7F:39:C4:45:AB:A5:24: 34:7F:F7:7F:8F:02:20:6C:68:BB:CB:59:B4:34:F9:01: 21:E2:E9:8A:D1:DF:90:DE:B9:37:B3:C7:60:EF:C5:0C: F1:DA:9C:5E:D0:B7:58 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 : Jan 25 08:39:11.186 2026 GMT Extensions: 00:00:05:00:01:D9:51:6F Signature : ecdsa-with-SHA256 30:46:02:21:00:93:77:2C:FB:4A:35:66:02:E7:5A:22: B2:45:39:DF:E9:C0:D7:54:83:7A:CE:DF:3A:91:17:0E: FB:50:1B:6B:9E:02:21:00:ED:1C:34:42:B1:F9:FB:9F: 06:09:A0:D4:B0:24:4F:0A:17:7C:35:36:11:F4:1F:C7: 3E:5C:AC:21:FD:27:AB:FB Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 59:6E:6C:33:86:94:B2:59:72:A2:56:C8:A0:E8:DD:90: 4A:76:E8:08:3D:DA:87:3B:01:08:38:28:14:3C:EE:59 Timestamp : Jan 25 08:39:11.434 2026 GMT Extensions: 00:00:05:00:00:16:92:6B Signature : ecdsa-with-SHA256 30:46:02:21:00:A9:78:BF:1B:63:BA:0C:C4:16:A8:0D: BC:23:A3:57:A4:A5:2D:75:96:6E:38:53:CD:7B:F1:60: B5:91:FE:18:F4:02:21:00:96:39:FC:72:69:39:15:EE: 5B:A1:5E:02:E8:14:B2:B3:4B:0C:A8:16:C5:D8:36:E0: 77:58:B9:92:02:E7:56:C6
-----BEGIN CERTIFICATE-----
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cFRXp/wU
-----END CERTIFICATE-----

Cipher: ECDHE-RSA-AES128-GCM-SHA256 · Checked 2026-11-06T04:10:01+00:00

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

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