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

cyf-kr.edu.pl · 149.156.4.133:443

Verified

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

Subject
CN=*.cyf-kr.edu.pl
Issuer
C=GR O=Hellenic Academic and Research Institutions CA CN=GEANT TLS RSA 1
Valid from
2026-09-10T10:00:48+00:00
Expires
2027-03-28T10:00:47+00:00
Days remaining
146
Serial (hex)
0FAA70711E0B68644CD3AA74E53BC832
Signature
RSA-SHA256
Public key
RSA 3072

Subject alternative names (SAN)

DNS:*.cyf-kr.edu.pl, DNS:cyf-kr.edu.pl

SHA-256 fingerprint

E7:E5:DB:AF:AE:3E:DB:29:86:22:A3:9B:C3:0F:BF:25:7A:8B:DC:AF:03:09:33:24:02:FC:13:1F:48:1F:D4:81
Certificate extensions & PEM
authorityKeyIdentifier
86:01:72:3F:8C:A9:70:E2:31:06:53:16:CE:01:5F:5B:79:C8:3C:3B
authorityInfoAccess
CA Issuers - URI:http://crt.harica.gr/HARICA-GEANT-TLS-R1.cer
subjectAltName
DNS:*.cyf-kr.edu.pl, DNS:cyf-kr.edu.pl
certificatePolicies
Policy: 2.23.140.1.2.1 Policy: 0.4.0.2042.1.6 Policy: 1.3.6.1.4.1.26513.1.1.1.1
extendedKeyUsage
TLS Web Client Authentication, TLS Web Server Authentication
crlDistributionPoints
Full Name: URI:http://crl.harica.gr/HARICA-GEANT-TLS-R1.crl
subjectKeyIdentifier
24:A1:DF:2F:53:29:E8:B1:E0:72:AA:55:1F:A1:8B:05:4A:1E:90:53
keyUsage
Digital Signature, Key Encipherment
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 60:4C:9A:AF:7A:7F:77:5F:01:D4:06:FC:92:0D:C8:99: EB:0B:1C:7D:F8:C9:52:1B:FA:FA:17:77:3B:97:8B:C9 Timestamp : Sep 10 10:10:50.258 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:B4:4A:5C:7C:EA:E7:36:7A:5B:CF:B6: 55:10:15:BA:43:51:2E:FF:90:2E:31:E9:3A:4C:1B:E9: A4:16:17:68:7B:02:21:00:81:42:2E:76:DE:84:39:21: 71:64:BB:DD:A7:32:64:EF:77:65:68:3D:65:09:15:14: 5C:BD:BA:A0:C7:2D:70:28 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 46:A2:39:67:C6:0D:B6:46:87:C6:6F:3D:F9:99:94:76: 93:A6:A6:11:20:84:57:D5:55:E7:E3:D0:A1:D9:B6:46 Timestamp : Sep 10 10:10:50.289 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:7B:31:D2:AE:4E:E5:50:87:BE:F1:32:40: C8:EB:5F:FD:4B:6F:F8:56:EA:62:5C:6F:61:FC:CD:6E: 74:9D:18:4C:02:21:00:BD:DD:21:D7:2A:37:2F:00:76: 23:6A:EF:74:9D:0F:BD:62:49:F2:6E:66:41:24:E3:4E: 1E:E0:95:8B:A9:27:D9 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 : Sep 10 10:10:50.234 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:45:CA:95:FA:ED:11:43:A0:C4:6D:9B:10: 90:B1:52:13:12:E0:96:36:B4:FD:DF:13:FE:0E:FA:CB: 7F:DC:47:A1:02:20:4F:BA:25:B2:44:54:F1:60:6C:B5: 7A:13:53:44:FE:27:09:D1:BD:F9:76:07:64:CF:69:2E: 8A:62:AE:67:3E:1F
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: ECDHE-RSA-AES128-GCM-SHA256 · Checked 2026-11-01T17:37:53+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=GR O=Hellenic Academic and Research Institutions CA CN=GEANT TLS RSA 1
Issuer
C=GR O=Hellenic Academic and Research Institutions CA CN=HARICA TLS RSA Root CA 2021
Valid from
2025-01-03T11:15:00+00:00
Expires
2039-12-31T11:14:59+00:00
Days remaining
4807
Serial (hex)
14D57BF3692228219A5567FA91651B22
Signature
RSA-SHA256
Public key
RSA 3072

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

5B:67:8D:C4:40:95:A5:28:95:B6:3B:31:F2:72:27:F4:B3:6C:3E:34:74:91:BF:2B:FA:69:18:37:A5:FB:8C:79
Certificate extensions & PEM
basicConstraints
CA:TRUE, pathlen:0
authorityKeyIdentifier
0A:48:23:A6:60:A4:92:0A:33:EA:93:5B:C5:57:EA:25:4D:BD:12:EE
authorityInfoAccess
CA Issuers - URI:http://crt.harica.gr/HARICA-TLS-Root-2021-RSA.cer
certificatePolicies
Policy: X509v3 Any Policy
extendedKeyUsage
TLS Web Client Authentication, TLS Web Server Authentication
crlDistributionPoints
Full Name: URI:http://crl.harica.gr/HARICA-TLS-Root-2021-RSA.crl
subjectKeyIdentifier
86:01:72:3F:8C:A9:70:E2:31:06:53:16:CE:01:5F:5B:79:C8:3C:3B
keyUsage
Digital Signature, Certificate Sign, CRL Sign
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Chain certificate 2

Subject
C=GR O=Hellenic Academic and Research Institutions CA CN=HARICA TLS RSA Root CA 2021
Issuer
C=GR L=Athens O=Hellenic Academic and Research Institutions Cert. Authority CN=Hellenic Academic and Research Institutions RootCA 2015
Valid from
2021-09-02T07:41:55+00:00
Expires
2029-08-31T07:41:54+00:00
Days remaining
1033
Serial (hex)
2A6086D4D4DE45C95E4B98FBBF2FBF26
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

4A:CD:8D:C6:02:0A:54:5A:85:89:43:A5:53:B5:E0:F3:FC:5B:85:9A:EA:17:46:65:0D:69:CF:12:10:F9:56:D8
Certificate extensions & PEM
basicConstraints
CA:TRUE
authorityKeyIdentifier
71:15:67:C8:C8:C9:BD:75:5D:72:D0:38:18:6A:9D:F3:71:24:54:0B
authorityInfoAccess
CA Issuers - URI:http://repo.harica.gr/certs/HaricaRootCA2015.crt
certificatePolicies
Policy: X509v3 Any Policy
extendedKeyUsage
TLS Web Client Authentication, TLS Web Server Authentication
crlDistributionPoints
Full Name: URI:http://crl.harica.gr/HaricaRootCA2015.crl
subjectKeyIdentifier
0A:48:23:A6:60:A4:92:0A:33:EA:93:5B:C5:57:EA:25:4D:BD:12:EE
keyUsage
Digital Signature, Certificate Sign, CRL Sign
-----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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