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

nmmn.de · 217.114.70.21:443

Unverified
Certificate verification failed. These are unverified certificate details presented by the server. Peer certificate subjectAltName did not match expected name `nmmn.de'
The certificate expires within 30 days.

Certificate verification failed

Subject
C=DE ST=Hamburg L=Hamburg O=NMMN New Media Markets & Networks IT-Services GmbH CN=*.nmmn.com
Issuer
C=DE O=United SSL Deutschland GmbH CN=United Trust
Valid from
2025-10-15T08:07:56+00:00
Expires
2026-11-14T08:07:55+00:00
Days remaining
16
Serial (hex)
764C7873862A9E314ED4FF71DA626EAE
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

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

SHA-256 fingerprint

73:F5:A4:C0:6B:AB:CD:19:A2:65:BE:64:F4:74:4D:B4:28:F6:D6:C9:8B:EA:45:9B:80:CC:34:00:50:D9:03:CD
Certificate extensions & PEM
basicConstraints
CA:FALSE
crlDistributionPoints
Full Name: URI:http://unitedtrustov.crl.certum.pl/unitedtrustov.crl
authorityInfoAccess
OCSP - URI:http://unitedtrustov.ocsp-certum.com CA Issuers - URI:http://repository.certum.pl/unitedtrustov.cer
authorityKeyIdentifier
EE:77:78:BA:00:1D:F3:D8:9C:92:90:6D:BA:92:E5:22:B7:53:42:99
subjectKeyIdentifier
C7:41:39:E3:0F:42:7D:50:78:E3:C5:75:B8:68:73:16:AD:FA:B8:08
certificatePolicies
Policy: 2.23.140.1.2.2 Policy: 1.2.616.1.113527.2.5.1.9.41.2 CPS: https://www.certum.pl/CPS
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 : D7:6D:7D:10:D1:A7:F5:77:C2:C7:E9:5F:D7:00:BF:F9: 82:C9:33:5A:65:E1:D0:B3:01:73:17:C0:C8:C5:69:77 Timestamp : Oct 15 08:10:36.343 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:16:47:5F:68:CB:83:77:3F:BA:5B:DD:A1: 57:E3:8D:8E:A8:AE:44:EC:55:FF:75:A8:69:89:2E:4E: 1E:3C:D2:1A:02:21:00:E5:A4:8D:C9:CB:D6:A0:EA:23: C8:C0:6C:42:3B:CA:C1:FC:30:28:A3:40:0D:B4:54:48: 12:FA:F0:96:4D:DF:E4 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : C2:31:7E:57:45:19:A3:45:EE:7F:38:DE:B2:90:41:EB: C7:C2:21:5A:22:BF:7F:D5:B5:AD:76:9A:D9:0E:52:CD Timestamp : Oct 15 08:10:36.367 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:0B:61:6E:30:CF:B8:F1:B6:45:B1:95:D6: 3B:C1:86:E6:44:FF:55:2D:96:86:7D:66:BB:C2:20:FB: 27:BD:36:9D:02:21:00:D3:0B:01:77:11:BC:DE:76:5B: 14:66:17:07:65:BE:25:CE:6C:AE:C0:EB:1F:AF:F7:97: 86:1E:07:A1:66:A0:06 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : AC:AB:30:70:6C:EB:EC:84:31:F4:13:D2:F4:91:5F:11: 1E:42:24:43:B1:F2:A6:8C:4F:3C:2B:3B:A7:1E:02:C3 Timestamp : Oct 15 08:10:36.324 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:A6:81:A5:69:19:29:6C:46:71:3A:F0: 2C:76:75:C9:A5:1B:1E:62:43:0B:E7:2E:77:84:2D:B8: E2:AB:C0:89:D1:02:20:7A:DF:08:B4:AF:DF:21:26:A0: 5E:E9:FA:F8:1A:AC:5F:B1:A5:DF:3D:27:73:87:F4:95: 2F:43:1C:FF:BF:68:32
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-10-28T17:43:53+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=DE O=United SSL Deutschland GmbH CN=United Trust
Issuer
C=PL O=Unizeto Technologies S.A. OU=Certum Certification Authority CN=Certum Global Services CA SHA2
Valid from
2021-02-24T09:00:24+00:00
Expires
2027-05-31T09:00:24+00:00
Days remaining
214
Serial (hex)
4BE92A902784951DC13AC6CE37D230FE
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

68:FC:62:37:C4:B8:72:2A:1B:DF:B9:58:3F:72:88:40:A1:8B:FC:C3:D6:C6:E1:D6:B0:A3:07:62:45:77:DB:D0
Certificate extensions & PEM
basicConstraints
CA:TRUE, pathlen:0
subjectKeyIdentifier
EE:77:78:BA:00:1D:F3:D8:9C:92:90:6D:BA:92:E5:22:B7:53:42:99
authorityKeyIdentifier
54:99:DD:9B:FF:E8:A7:0E:A3:19:9D:5B:BE:42:57:DF:30:FC:8F:32
keyUsage
Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
crlDistributionPoints
Full Name: URI:http://subca.crl.certum.pl/gscasha2.crl
authorityInfoAccess
OCSP - URI:http://subca.ocsp-certum.com CA Issuers - URI:http://repository.certum.pl/gscasha2.cer
certificatePolicies
Policy: X509v3 Any Policy CPS: https://www.certum.pl/CPS
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Chain certificate 2

Subject
C=PL O=Unizeto Technologies S.A. OU=Certum Certification Authority CN=Certum Global Services CA SHA2
Issuer
C=PL O=Unizeto Technologies S.A. OU=Certum Certification Authority CN=Certum Trusted Network CA
Valid from
2014-09-11T12:00:00+00:00
Expires
2027-06-09T10:46:39+00:00
Days remaining
223
Serial (hex)
D04B6FE5DD5BD221E7C74CF6468B3146
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

9E:85:2C:59:DF:C6:FD:6A:BD:4E:17:EA:80:B5:F4:E5:6F:C0:41:92:D1:07:25:8D:54:DA:8A:92:52:86:70:D6
Certificate extensions & PEM
basicConstraints
CA:TRUE
subjectKeyIdentifier
54:99:DD:9B:FF:E8:A7:0E:A3:19:9D:5B:BE:42:57:DF:30:FC:8F:32
authorityKeyIdentifier
08:76:CD:CB:07:FF:24:F6:C5:CD:ED:BB:90:BC:E2:84:37:46:75:F7
keyUsage
Certificate Sign, CRL Sign
crlDistributionPoints
Full Name: URI:http://crl.certum.pl/ctnca.crl
authorityInfoAccess
OCSP - URI:http://subca.ocsp-certum.com CA Issuers - URI:http://repository.certum.pl/ctnca.cer
certificatePolicies
Policy: X509v3 Any Policy CPS: http://www.certum.pl/CPS
-----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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