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

ns1.mainmail.net · 138.121.98.157:443

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=wagner.mainmail.net
Issuer
C=US O=DigiCert Inc OU=www.digicert.com CN=GeoTrust TLS RSA CA G1
Valid from
2026-08-24T00:00:00+00:00
Expires
2027-02-19T23:59:59+00:00
Days remaining
124
Serial (hex)
0DB8BCF827D60102D2A7061BFF43B44E
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

DNS:wagner.mainmail.net

SHA-256 fingerprint

12:EE:7E:19:E1:6B:1B:A0:7E:AB:00:56:E1:27:C8:B5:C0:D8:B3:92:53:09:CE:90:BC:F3:04:4D:ED:8F:9D:37
Certificate extensions & PEM
authorityKeyIdentifier
94:4F:D4:5D:8B:E4:A4:E2:A6:80:FE:FD:D8:F9:00:EF:A3:BE:02:57
subjectKeyIdentifier
0D:6B:A4:0C:01:AB:BC:B7:32:E1:6D:2E:F9:C5:E5:EF:05:7D:07:77
subjectAltName
DNS:wagner.mainmail.net
certificatePolicies
Policy: 2.23.140.1.2.1 CPS: http://www.digicert.com/CPS
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
crlDistributionPoints
Full Name: URI:http://cdp.geotrust.com/GeoTrustTLSRSACAG1.crl
authorityInfoAccess
OCSP - URI:http://status.geotrust.com CA Issuers - URI:http://cacerts.geotrust.com/GeoTrustTLSRSACAG1.crt
basicConstraints
CA:FALSE
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 : Aug 24 03:13:29.095 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:14:6A:B3:10:CF:1A:4F:47:75:5F:C8:7A: EC:3D:C7:00:15:2D:8E:6D:9C:ED:BA:5E:F4:98:18:FC: 71:7B:32:18:02:20:31:22:7A:63:EA:FA:8C:5E:E1:A2: 95:38:B0:56:73:98:47:4B:EA:32:85:12:DB:AF:46:76: 58:02:68:04:18:2D 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 : Aug 24 03:13:28.987 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:66:70:7C:20:24:6A:21:E6:D7:81:89:C0: B6:7A:75:B8:D3:46:6E:84:FD:D0:93:0C:5B:BC:91:C9: E0:A4:9C:2F:02:21:00:C0:1B:06:3D:5A:63:E3:9D:D5: 6A:48:8D:8E:42:81:AA:59:89:E3:1F:42:41:25:58:8C: 46:10:2B:A1:71:C9:FF 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 : Aug 24 03:13:29.182 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:CC:C2:34:FE:68:C0:7E:5F:AB:3C:65: 12:62:BC:A9:9A:E3:32:79:35:31:2F:04:8B:43:3E:B0: A3:9F:2E:25:AA:02:21:00:C7:F9:B8:A0:48:BD:C2:38: 80:B9:B7:17:A5:C4:BF:C0:6A:3A:54:9F:D5:34:D0:FD: D7:D9:10:AC:58:B3:C1:DE
-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-10-18T05:13:30+00:00

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

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