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

cvut.cz · 147.32.3.202:443

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
C=CZ ST=Hlavní město Praha L=Praha 6 O=České vysoké učení technické v Praze CN=www.cvut.cz
Issuer
C=GR O=Hellenic Academic and Research Institutions CA CN=GEANT TLS RSA 1
Valid from
2026-08-14T11:30:42+00:00
Expires
2027-03-01T11:30:41+00:00
Days remaining
117
Serial (hex)
6C3BB736180958B11F79923ABCC731D5
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:www.cvut.cz, DNS:cvut.cz

SHA-256 fingerprint

DF:E8:E6:DD:31:3B:5D:AD:E9:CD:40:6E:CF:FB:EC:1B:50:69:A2:72:EB:94:E2:27:3C:D7:FA:AD:B6:11:19:EC
Certificate extensions & PEM
basicConstraints
CA:FALSE
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:www.cvut.cz, DNS:cvut.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
F1:AE:87:9F:F1:EA:E2:35:8D:77:03:8B:44:84:E1:A8:B3:F0:B4:A6
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 : Aug 14 11:40:44.110 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:11:63:DF:80:F6:43:5F:34:BA:99:2F:18: EA:B0:BE:F9:0F:AB:66:E3:57:98:99:B9:A4:EC:39:34: 26:B1:48:B0:02:20:5B:1D:F6:D5:D4:A8:0F:61:75:FF: 6E:09:71:F7:DD:E7:6C:07:4D:EA:4C:78:1A:A6:1D:89: 33:6B:BC:C9:E5:F5 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 : Aug 14 11:40:44.140 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:92:3B:E8:04:9B:77:45:F6:CA:05:20: 92:EF:E8:59:A7:F5:41:33:64:BD:42:28:A3:AB:16:AB: 1B:BB:1C:68:59:02:21:00:AA:85:9F:02:3C:1B:3A:8D: 05:43:DE:90:AD:2B:C5:86:71:57:25:80:E9:8D:D0:9F: A5:C0:13:61:D0:BB:BA:71 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 : Aug 14 11:40:44.099 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:7C:63:82:12:8B:D5:FA:A6:56:92:DA:F7: EB:A5:74:E4:11:C7:5A:84:CC:C7:B1:45:AB:15:AD:43: 4C:1B:AB:52:02:21:00:AA:C4:06:7C:79:E8:A0:57:F1: 18:F0:71:0A:E8:1A:87:53:7E:C1:19:EA:80:6A:03:2F: EE:B7:50:33:6C:9D:E2
-----BEGIN CERTIFICATE-----
MIIG0jCCBTqgAwIBAgIQbDu3NhgJWLEfeZI6vMcx1TANBgkqhkiG9w0BAQsFADBg
MQswCQYDVQQGEwJHUjE3MDUGA1UECgwuSGVsbGVuaWMgQWNhZGVtaWMgYW5kIFJl
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B4o/S+XDSu2otjSZ2PN4114UkPp/J5QW864Vlhtqoe7qpRCXGskSIjzcKBMRBDJE
1ddrLZbMUkn7/uyOkxI260Rm1h5pFqXm2up1TLufQAm4KwX7H13yggfCzvVSR3VU
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0eMxz/jxxh7cd2EcB4Rcfrsk3oty4Q==
-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-11-04T00:53:47+00:00

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

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