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

ou.nl · 145.20.124.148:443

Verified

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

Subject
C=NL L=Heerlen O=Open Universiteit CN=www.ou.nl
Issuer
C=GR O=Hellenic Academic and Research Institutions CA CN=GEANT TLS RSA 1
Valid from
2026-09-29T08:26:23+00:00
Expires
2027-04-16T08:26:22+00:00
Days remaining
186
Serial (hex)
4E1F338BDC602C4182771F9ACD22A18D
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

DNS:www.ou.nl, DNS:ou.nl

SHA-256 fingerprint

BE:3D:13:D2:41:4E:9B:F5:28:97:F7:62:D2:4E:B3:24:57:60:88:6D:35:71:A1:7D:0E:25:15:C8:B1:1E:07:2A
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.ou.nl, DNS:ou.nl
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
A7:AA:B7:45:7A:94:2B:CB:7B:3C:06:50:FA:F7:2C:83:86:44:6A:F7
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 29 08:36:25.362 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:E2:F7:D5:79:A3:B5:13:38:34:D2:97: 2A:72:27:F5:19:1D:94:23:A7:08:46:8D:D8:E4:82:5D: 68:DA:29:05:3F:02:20:7C:C8:7A:3F:23:CB:72:B7:88: 45:7B:46:BD:00:A6:8E:83:8A:6D:1F:8B:AD:40:E0:23: 65:3A:FA:45:31:F4:4A 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 29 08:36:25.391 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:76:DB:A9:2B:0F:A0:08:38:EF:30:90:70: 7D:F8:CD:59:A2:92:4E:0C:88:1F:50:27:EB:DB:EA:04: 39:DA:84:29:02:21:00:81:5D:D9:E2:90:64:9F:36:51: 50:F3:70:14:2D:F7:BF:6B:B9:F4:70:A7:9E:D1:F0:DA: C1:4B:2E:22:66:FB:14 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 29 08:36:25.343 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:38:E8:76:3F:E5:77:B9:CB:DB:F5:58:33: 17:1F:3D:4E:F7:5A:A1:E2:D8:A0:E6:C0:8A:E0:C5:68: 27:08:C0:E3:02:21:00:80:24:F4:DC:62:02:7C:8A:4C: 23:BE:53:6A:4C:28:D6:D7:28:33:AB:E6:D8:B4:BD:BC: 13:B1:9C:23:BD:DC:C8
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-10-11T19:17:12+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
4828
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
1054
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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