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

mail01.netatvision.de · 185.66.133.240:443

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=*.beratergruppe.de
Issuer
C=PL O=Asseco Data Systems S.A. CN=Certum DV TLS G2 R39 CA
Valid from
2026-06-16T11:34:26+00:00
Expires
2027-01-01T11:34:25+00:00
Days remaining
61
Serial (hex)
1A0492AFCEC812D310DD5AC632349720
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:*.beratergruppe.de, DNS:beratergruppe.de

SHA-256 fingerprint

58:41:5E:DA:92:1E:BC:D7:F6:10:92:EA:12:CD:E0:27:9C:20:99:6F:29:70:92:84:1F:EF:3F:0F:AA:F3:EC:FD
Certificate extensions & PEM
basicConstraints
CA:FALSE
crlDistributionPoints
Full Name: URI:http://certumdvtlsg2r39ca.crl.certum.pl/certumdvtlsg2r39ca.crl
authorityInfoAccess
OCSP - URI:http://certumdvtlsg2r39ca.ocsp-certum.com CA Issuers - URI:http://certumdvtlsg2r39ca.repository.certum.pl/certumdvtlsg2r39ca.cer
authorityKeyIdentifier
33:A8:77:B7:01:38:6F:5F:1F:24:24:A2:1E:6C:14:E3:6E:22:03:DF
certificatePolicies
Policy: 2.23.140.1.2.1 Policy: 1.2.616.1.113527.2.101.1
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
keyUsage
Digital Signature, Key Encipherment
subjectAltName
DNS:*.beratergruppe.de, DNS:beratergruppe.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 : Jun 16 11:34:27.194 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:44:28:CD:3C:02:AC:98:75:EE:A3:DB:20: 9F:FB:48:9B:98:BA:CE:03:24:FE:EA:A0:72:97:FC:8B: 9D:AC:51:A8:02:21:00:C7:9F:3D:8D:D0:D9:CC:3F:8E: D3:F3:20:CD:BF:03:BE:98:15:71:5E:03:99:6B:96:7D: CD:40:E1:B4:6B:82:66 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 44:C2:BD:0C:E9:14:0E:64:A5:C9:4A:01:93:0A:5A:A1: BB:35:97:0E:00:EE:11:16:89:68:2A:1C:44:D7:B5:66 Timestamp : Jun 16 11:34:26.986 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:6A:4F:7C:8E:5C:82:F1:7C:B6:87:C5:BC: 5C:B2:1E:FD:EA:8B:9D:FD:F2:32:E0:A0:2C:37:34:8D: CD:11:3D:C4:02:21:00:A7:6D:E6:59:1A:AA:49:C0:9C: D9:89:12:64:A3:F7:B1:96:83:EF:2F:0B:1C:4B:76:5D: EC:64:CF:F3:3F:79:E2 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : D6:D5:8D:A9:D0:17:53:F3:6A:4A:A0:C7:57:49:02:AF: EB:C7:DC:2C:D3:8C:D9:F7:64:C8:0C:89:19:1E:9F:02 Timestamp : Jun 16 11:34:27.498 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:AB:1B:17:77:8A:73:44:D9:8B:A7:5A: 1B:EA:D3:FD:A6:A3:C3:9B:3B:15:DF:36:CE:29:CB:89: 3F:C3:8E:C7:8E:02:21:00:EE:83:DF:26:89:1C:77:0B: 12:DD:58:7F:D8:C5:A3:94:94:60:1E:54:AD:11:66:4D: A0:56:D6:7F:CF:54:88:E4
-----BEGIN CERTIFICATE-----
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8AfV16yD
-----END CERTIFICATE-----

Cipher: ECDHE-RSA-AES128-GCM-SHA256 · Checked 2026-10-31T19:38:09+00:00

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

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