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

upol.cz · 158.194.230.160:443

Verified
The certificate expires within 30 days.

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

Subject
C=CZ ST=Olomoucký kraj L=Olomouc O=Univerzita Palackého v Olomouci CN=*.upol.cz
Issuer
C=GR O=Hellenic Academic and Research Institutions CA CN=GEANT TLS RSA 1
Valid from
2025-11-24T09:52:54+00:00
Expires
2026-11-24T09:52:54+00:00
Days remaining
17
Serial (hex)
0302BA2D19CBA72846249D47E54DFD91
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:*.upol.cz, DNS:upol.cz

SHA-256 fingerprint

1C:B7:33:69:A2:D5:10:B1:FC:BB:77:73:44:90:5D:8D:B7:AF:1E:49:A8:DE:05:67:28:28:3A:5F:20:B6:11:48
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 OCSP - URI:http://ocsp-tls.harica.gr
subjectAltName
DNS:*.upol.cz, DNS:upol.cz
certificatePolicies
Policy: 2.23.140.1.2.2 Policy: 0.4.0.2042.1.7 Policy: 1.3.6.1.4.1.26513.1.1.1.2
extendedKeyUsage
TLS Web Client Authentication, TLS Web Server Authentication
crlDistributionPoints
Full Name: URI:http://crl.harica.gr/HARICA-GEANT-TLS-R1.crl
subjectKeyIdentifier
38:A7:A0:9C:36:9D:9F:88:DE:44:62:DA:DE:AC:41:61:D3:12:FA:3E
keyUsage
Digital Signature, Key Encipherment
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : AF:67:88:3B:57:B0:4E:DD:8F:A6:D9:7E:F6:2E:A8:EB: 81:0A:C7:71:60:F0:24:5E:55:D6:0C:2F:E7:85:87:3A Timestamp : Nov 24 10:02:56.595 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:CD:40:CC:27:5A:41:80:4D:60:84:91: D0:A7:F2:48:15:58:3F:14:71:A0:D2:0F:CB:06:7A:E1: 40:38:52:D7:82:02:20:36:4E:94:C6:8D:EC:D7:24:7B: CD:7D:08:F1:13:5F:53:BA:95:51:EF:10:60:66:37:44: 68:52:5E:69:10:E2:A2 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : D8:09:55:3B:94:4F:7A:FF:C8:16:19:6F:94:4F:85:AB: B0:F8:FC:5E:87:55:26:0F:15:D1:2E:72:BB:45:4B:14 Timestamp : Nov 24 10:02:56.526 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:7B:03:3F:B1:5E:AF:3D:35:5F:20:D0:B5: E3:4F:FE:15:56:A6:63:2B:9D:EF:46:7C:89:AB:B2:C3: 7E:90:F3:70:02:20:0F:BD:4A:08:93:6B:6A:7D:6F:C6: 2B:4F:3B:F0:09:BC:7B:C1:3C:F8:D6:D6:B8:10:69:A4: B8:68:49:A9:9A:42 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 : Nov 24 10:02:56.578 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:46:7F:B6:4F:02:1F:81:9F:E1:0A:34:38: 39:61:CB:D9:DC:14:2D:9A:38:07:87:EC:A6:60:0D:37: 30:24:1D:4A:02:20:16:FE:F6:D3:2F:A5:09:A0:F0:F2: B6:CE:F7:82:A6:F9:64:7B:6D:E1:57:3C:40:C1:5B:21: 57:46:0C:68:FB:E7
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: ECDHE-RSA-AES128-GCM-SHA256 · Checked 2026-11-07T01:17:42+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
4802
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
1028
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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