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

ns3.nmmn.de · 116.203.186.232:443

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=*.nmmn.com
Issuer
C=PL O=Asseco Data Systems S.A. CN=Certum DV TLS G2 R39 CA
Valid from
2026-10-28T13:15:18+00:00
Expires
2027-05-15T13:15:17+00:00
Days remaining
192
Serial (hex)
796338012380BC72082EAAAFD961AE4A
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:*.nmmn.com, DNS:nmmn.com

SHA-256 fingerprint

94:64:58:D6:BC:33:E5:5F:68:5F:0B:DA:E7:E4:57:50:A0:0D:F3:D2:2F:1F:E2:40:D6:C3:D6:1B:6E:CB:12:6A
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:*.nmmn.com, DNS:nmmn.com
ct_precert_scts
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 : Oct 28 13:15:21.057 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:BE:FC:98:B2:82:41:87:24:31:BB:40: 95:CF:DF:4B:D9:31:0C:61:AC:ED:A5:A1:08:44:43:38: F5:CB:75:E3:5C:02:20:6D:19:3F:5D:FE:2E:C4:90:CA: DB:D9:36:3D:0B:B6:BA:0A:0C:C1:E0:22:9B:17:C5:B3: D5:D0:EC:FD:D4:F3:34 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 : Oct 28 13:15:21.112 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:19:8B:E5:8F:36:33:5F:60:3F:62:61:EE: E2:BD:06:BC:EB:A5:A0:D7:D9:68:74:AB:85:A7:60:C6: 2C:3A:1E:99:02:20:13:5E:F7:EF:20:1B:0F:86:7D:C1: 85:EC:E3:2D:2A:8F:B2:29:3B:27:16:33:B2:22:B5:E1: 44:36:2E:8B:86:FE 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 : Oct 28 13:15:21.333 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:F3:09:95:87:81:63:83:58:B9:C1:E3: CD:90:6C:CA:14:5D:BD:B6:F2:05:E2:1C:58:C3:D9:9E: 1F:56:8E:54:F5:02:21:00:FD:48:74:C7:1F:BD:A2:FA: AF:8E:36:16:4D:A2:EF:B4:66:C6:60:71:FE:4D:0D:F0: 9E:EA:26:CC:8E:50:41:49
-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-11-04T03:59:14+00:00

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

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