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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

mk.de · 213.172.99.99:443

Verified

Certificate chain, hostname and dates verified using this server’s CA store.

Subject
CN=*.mk.de
Issuer
C=PL O=Asseco Data Systems S.A. CN=Certum DV TLS G2 R39 CA
Valid from
2026-03-05T11:14:27+00:00
Expires
2027-03-05T11:14:26+00:00
Days remaining
155
Serial (hex)
78A77DD10FBEF98A1BB719DDEE2792C4
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

DNS:*.mk.de, DNS:mk.de

SHA-256 fingerprint

80:8B:DC:30:68:44:2F:D6:C9:8D:A1:1B:18:58:37:87:68:C8:7E:10:32:61:A7:44:04:35:39:AE:8B:E1:A6:38
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:*.mk.de, DNS:mk.de
ct_precert_scts
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 : Mar 5 11:14:28.470 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:D6:5E:DA:58:1E:32:01:22:E5:27:F6: E4:25:E4:5A:66:F6:95:DB:4D:93:5F:51:8E:6D:D8:3C: A5:86:79:50:35:02:20:04:13:5D:5D:01:24:AE:9E:8D: 09:C4:56:04:DE:1D:F8:52:6E:B1:53:60:E2:8B:09:DA: A7:52:1D:3E:44:C7:6A 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 : Mar 5 11:14:28.669 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:30:F3:47:C9:05:30:30:B3:3E:45:9F:24: 51:00:AC:65:89:E5:95:26:58:22:52:23:F5:E3:73:76: 4C:34:53:72:02:20:14:D6:AD:7C:FA:42:26:CB:3C:BE: 3F:D2:B8:D6:5C:EC:3C:BF:D3:C8:F6:F3:2B:27:8B:5E: 46:FD:14:06:2F:1D 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 : Mar 5 11:14:28.505 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:05:90:5D:2F:9E:F9:5A:BB:BA:AA:75:F0: DD:2C:5B:58:DA:4F:20:30:38:E2:55:6D:BD:B7:F1:86: F3:A8:BC:CC:02:20:3B:0D:25:4A:23:5A:BA:B3:CE:27: B4:A0:2F:5E:8F:63:35:AD:C8:78:B1:0D:CE:52:4F:B2: CD:16:C2:49:0B:5B
-----BEGIN CERTIFICATE-----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twE4b18fJCSiHmwU424iA98wIQYDVR0gBBowGDAIBgZngQwBAgEwDAYKKoRoAYb2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-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-09-30T12:47:34+00:00

Server-presented chain · 1 additional certificate

Chain certificate 1

Subject
C=PL O=Asseco Data Systems S.A. CN=Certum DV TLS G2 R39 CA
Issuer
C=PL O=Asseco Data Systems S.A. OU=Certum Certification Authority CN=Certum Trusted Root CA
Valid from
2024-06-18T07:41:22+00:00
Expires
2039-06-05T07:41:22+00:00
Days remaining
4630
Serial (hex)
A82DD9E5DCAFDF13205E70043E6B95A8
Signature
RSA-SHA512
Public key
RSA 4096

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

83:C0:A5:A7:68:44:C8:40:DF:AF:82:0F:FD:02:AD:F6:57:3A:26:82:3E:F6:AF:75:8A:33:84:A0:AC:04:40:83
Certificate extensions & PEM
authorityInfoAccess
CA Issuers - URI:http://subca.repository.certum.pl/ctrca.cer OCSP - URI:http://subca.ocsp-certum.com
authorityKeyIdentifier
8C:FB:1C:75:BC:02:D3:9F:4E:2E:48:D9:F9:60:54:AA:C4:B3:4F:FA
basicConstraints
CA:TRUE, pathlen:0
crlDistributionPoints
Full Name: URI:http://subca.crl.certum.pl/ctrca.crl
extendedKeyUsage
TLS Web Client Authentication, TLS Web Server Authentication
keyUsage
Certificate Sign, CRL Sign
certificatePolicies
Policy: X509v3 Any Policy
subjectKeyIdentifier
33:A8:77:B7:01:38:6F:5F:1F:24:24:A2:1E:6C:14:E3:6E:22:03:DF
-----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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