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

dju.ac.kr · 203.237.128.80:443

Verified

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

Subject
C=KR ST=Daejeon L=Dong-gu O=Daejeon University CN=*.dju.ac.kr
Issuer
C=BE O=GlobalSign nv-sa CN=GlobalSign RSA OV SSL CA 2018
Valid from
2025-11-10T02:51:01+00:00
Expires
2026-12-12T02:51:00+00:00
Days remaining
39
Serial (hex)
4A3DB77E4764294F0D0128F7
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:*.dju.ac.kr, DNS:dju.ac.kr

SHA-256 fingerprint

69:63:6F:DE:31:F9:B1:D1:C8:0F:8D:BA:AC:9D:50:DD:E3:40:37:59:F1:B5:7B:50:FE:05:59:E0:79:4F:FB:E5
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
basicConstraints
CA:FALSE
authorityInfoAccess
CA Issuers - URI:http://secure.globalsign.com/cacert/gsrsaovsslca2018.crt OCSP - URI:http://ocsp.globalsign.com/gsrsaovsslca2018
certificatePolicies
Policy: 1.3.6.1.4.1.4146.1.20 CPS: https://www.globalsign.com/repository/ Policy: 2.23.140.1.2.2
subjectAltName
DNS:*.dju.ac.kr, DNS:dju.ac.kr
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
authorityKeyIdentifier
F8:EF:7F:F2:CD:78:67:A8:DE:6F:8F:24:8D:88:F1:87:03:02:B3:EB
subjectKeyIdentifier
A5:EC:C9:A3:11:EE:CF:C1:79:90:5D:08:70:E0:9B:3C:0A:DA:39:E0
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 94:4E:43:87:FA:EC:C1:EF:81:F3:19:24:26:A8:18:65: 01:C7:D3:5F:38:02:01:3F:72:67:7D:55:37:2E:19:D8 Timestamp : Nov 10 02:51:18.963 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:A9:42:AE:F6:E3:ED:DA:FD:B7:6C:82: FD:2F:C6:20:8A:0C:B6:3E:20:1E:98:B5:A7:3F:1D:4B: F7:34:BF:71:15:02:20:05:0B:D2:41:EF:91:1C:B9:85: 6D:DA:B0:2E:A7:5E:96:F6:4C:C1:43:06:EB:13:20:5A: 36:54:EA:08:92:AB:B2 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : CB:38:F7:15:89:7C:84:A1:44:5F:5B:C1:DD:FB:C9:6E: F2:9A:59:CD:47:0A:69:05:85:B0:CB:14:C3:14:58:E7 Timestamp : Nov 10 02:51:18.528 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:37:BD:AD:DF:27:FE:24:42:7A:E2:78:BC: 4E:84:1E:46:4F:1B:6B:0F:3A:1E:8E:25:F5:BE:41:FA: 47:CE:5B:47:02:20:5C:72:1F:02:FC:B3:38:82:E7:6B: 4E:B1:BA:52:BE:9F:05:F0:B2:46:80:83:5E:91:B4:E5: 9D:AE:F8:ED:9E:65 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : C2:31:7E:57:45:19:A3:45:EE:7F:38:DE:B2:90:41:EB: C7:C2:21:5A:22:BF:7F:D5:B5:AD:76:9A:D9:0E:52:CD Timestamp : Nov 10 02:51:18.903 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:D4:01:89:8D:B1:B6:74:D1:14:71:59: 80:7F:01:6E:BA:63:D1:04:7F:43:9C:7C:D0:76:B8:7E: A0:AB:5F:41:35:02:21:00:AD:C8:F4:56:F2:5D:B7:86: AB:24:5D:29:DC:80:BB:94:0E:02:69:9C:B0:8F:05:58: 3E:84:7D:43:48:C1:55:6B
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: ECDHE-RSA-AES128-GCM-SHA256 · Checked 2026-11-02T03:24:41+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=BE O=GlobalSign nv-sa CN=GlobalSign RSA OV SSL CA 2018
Issuer
OU=GlobalSign Root CA - R3 O=GlobalSign CN=GlobalSign
Valid from
2018-11-21T00:00:00+00:00
Expires
2028-11-21T00:00:00+00:00
Days remaining
749
Serial (hex)
01EE5F221DFC623BD4333A8557
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

B6:76:FF:A3:17:9E:88:12:09:3A:1B:5E:AF:EE:87:6A:E7:A6:AA:F2:31:07:8D:AD:1B:FB:21:CD:28:93:76:4A
Certificate extensions & PEM
keyUsage
Digital Signature, Certificate Sign, CRL Sign
basicConstraints
CA:TRUE, pathlen:0
subjectKeyIdentifier
F8:EF:7F:F2:CD:78:67:A8:DE:6F:8F:24:8D:88:F1:87:03:02:B3:EB
authorityKeyIdentifier
8F:F0:4B:7F:A8:2E:45:24:AE:4D:50:FA:63:9A:8B:DE:E2:DD:1B:BC
authorityInfoAccess
OCSP - URI:http://ocsp2.globalsign.com/rootr3
crlDistributionPoints
Full Name: URI:http://crl.globalsign.com/root-r3.crl
certificatePolicies
Policy: X509v3 Any Policy CPS: https://www.globalsign.com/repository/
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Chain certificate 2

Subject
OU=GlobalSign Root CA - R3 O=GlobalSign CN=GlobalSign
Issuer
OU=GlobalSign Root CA - R3 O=GlobalSign CN=GlobalSign
Valid from
2009-03-18T10:00:00+00:00
Expires
2029-03-18T10:00:00+00:00
Days remaining
867
Serial (hex)
04000000000121585308A2
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

CB:B5:22:D7:B7:F1:27:AD:6A:01:13:86:5B:DF:1C:D4:10:2E:7D:07:59:AF:63:5A:7C:F4:72:0D:C9:63:C5:3B
Certificate extensions & PEM
keyUsage
Certificate Sign, CRL Sign
basicConstraints
CA:TRUE
subjectKeyIdentifier
8F:F0:4B:7F:A8:2E:45:24:AE:4D:50:FA:63:9A:8B:DE:E2:DD:1B:BC
-----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

Registration / WHOIS →DNS records →