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

korea.ac.kr · 163.152.6.10:443

Verified

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

Subject
CN=*.korea.ac.kr
Issuer
C=BE O=GlobalSign nv-sa CN=GlobalSign GCC R3 DV TLS CA 2020
Valid from
2026-02-23T08:15:31+00:00
Expires
2027-03-27T08:15:30+00:00
Days remaining
139
Serial (hex)
1DB021AEAB2A16D5D1B30C47
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:*.korea.ac.kr, DNS:korea.ac.kr

SHA-256 fingerprint

39:87:1A:FE:D6:A8:24:BA:6A:DC:94:E3:58:89:1D:E6:25:ED:E9:61:F0:47:42:05:E4:E3:CA:2E:5D:89:09:84
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
basicConstraints
CA:FALSE
authorityInfoAccess
CA Issuers - URI:http://secure.globalsign.com/cacert/gsgccr3dvtlsca2020.crt OCSP - URI:http://ocsp.globalsign.com/gsgccr3dvtlsca2020
certificatePolicies
Policy: 1.3.6.1.4.1.4146.1.10 CPS: https://www.globalsign.com/repository/ Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://crl.globalsign.com/gsgccr3dvtlsca2020.crl
subjectAltName
DNS:*.korea.ac.kr, DNS:korea.ac.kr
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
authorityKeyIdentifier
0D:98:C0:73:7F:AB:BD:BD:D9:47:4B:49:AD:0A:4A:0C:AC:3E:C7:7C
subjectKeyIdentifier
0B:7F:32:9F:C4:2A:7A:E3:93:F1:69:5D:87:97:C6:D4:4F:05:CF:AF
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 1C:9F:68:2C:E9:FA:F0:45:69:50:F8:1B:96:8A:87:DD: DB:32:10:D8:4C:E6:C8:B2:E3:82:52:4A:C4:CF:59:9F Timestamp : Feb 23 08:15:36.013 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:1C:C9:EB:52:00:4F:0B:46:2E:32:96:B9: F0:A4:60:DF:99:CC:A3:40:98:04:80:7E:6E:76:39:A3: 05:C6:E3:93:02:21:00:B7:A0:AA:0B:8C:CE:37:67:AB: FB:22:A8:F7:BF:E1:D5:87:98:7C:10:25:7C:D3:4A:AB: 08:FA:D2:9E:8F:81:7D Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 4C:63:DC:98:E5:9C:1D:AB:88:F6:1E:8A:3D:DE:AE:8F: AB:44:A3:37:7B:5F:9B:94:C3:FB:A1:9C:FC:C1:BE:26 Timestamp : Feb 23 08:15:35.256 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:70:0B:F7:E1:27:2B:CA:54:45:73:D2:B3: 31:A4:47:77:4C:BB:28:AB:FE:24:4C:18:13:D0:55:A6: C6:4A:34:7F:02:21:00:89:59:60:4F:67:42:96:C8:C0: 11:77:D1:B1:37:4A:CF:9E:6C:C8:D8:2F:6A:A4:D1:41: F4:A8:6B:48:B4:39:3B 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 : Feb 23 08:15:36.358 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:4C:00:3D:1B:B2:C6:54:3B:99:03:6A:D0: 00:4C:43:1D:D3:0A:F2:05:65:3C:27:DD:C9:42:BF:18: 9D:FA:11:68:02:20:27:EF:EC:78:2F:92:AD:0E:7D:72: B0:DD:28:7C:93:D8:BA:3F:86:47:0F:20:C1:66:63:94: F2:47:1B:52:80:B0
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-11-08T00:19:28+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

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
861
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-----
MIIDXzCCAkegAwIBAgILBAAAAAABIVhTCKIwDQYJKoZIhvcNAQELBQAwTDEgMB4G
A1UECxMXR2xvYmFsU2lnbiBSb290IENBIC0gUjMxEzARBgNVBAoTCkdsb2JhbFNp
Z24xEzARBgNVBAMTCkdsb2JhbFNpZ24wHhcNMDkwMzE4MTAwMDAwWhcNMjkwMzE4
MTAwMDAwWjBMMSAwHgYDVQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMzETMBEG
A1UEChMKR2xvYmFsU2lnbjETMBEGA1UEAxMKR2xvYmFsU2lnbjCCASIwDQYJKoZI
hvcNAQEBBQADggEPADCCAQoCggEBAMwldpB5BngiFvXAg7aEyiie/QV2EcWtiHL8
RgJDx7KKnQRfJMsuS+FggkbhUqsMgUdwbN1k0ev1LKMPgj0MK66X17YUhhB5uzsT
gHeMCOFJ0mpiLx9e+pZo34knlTifBtc+ycsmWQ1z3rDI6SYOgxXG71uL0gRgykmm
KPZpO/bLyCiR5Z2KYVc3rHQU3HTgOu5yLy6c+9C7v/U9AOEGM+iCK65TpjoWc4zd
QQ4gOsC0p6Hpsk+QLjJg6VfLuQSSaGjlOCZgdbKfd/+RFO+uIEn8rUAVSNECMWEZ
XriX7613t2Saer9fwRPvm2L7DWzgVGkWqQPabumDk3F2xmmFghcCAwEAAaNCMEAw
DgYDVR0PAQH/BAQDAgEGMA8GA1UdEwEB/wQFMAMBAf8wHQYDVR0OBBYEFI/wS3+o
LkUkrk1Q+mOai97i3Ru8MA0GCSqGSIb3DQEBCwUAA4IBAQBLQNvAUKr+yAzv95ZU
RUm7lgAJQayzE4aGKAczymvmdLm6AC2upArT9fHxD4q/c2dKg8dEe3jgr25sbwMp
jjM5RcOO5LlXbKr8EpbsU8Yt5CRsuZRj+9xTaGdWPoO4zzUhw8lo/s7awlOqzJCK
6fBdRoyV3XpYKBovHd7NADdBj+1EbddTKJd+82cEHhXXipa0095MJ6RMG3NzdvQX
mcIfeg7jLQitChws/zyrVQ4PkX4268NXSb7hLi18YIvDQVETI53O9zJrlAGomecs
Mx86OyXShkDOOyyGeMlhLxS67ttVb9+E7gUJTb0o2HLO02JQZR7rkpeDMdmztcpH
WD9f
-----END CERTIFICATE-----

Chain certificate 2

Subject
C=BE O=GlobalSign nv-sa CN=GlobalSign GCC R3 DV TLS CA 2020
Issuer
OU=GlobalSign Root CA - R3 O=GlobalSign CN=GlobalSign
Valid from
2020-07-28T00:00:00+00:00
Expires
2029-03-18T00:00:00+00:00
Days remaining
860
Serial (hex)
77BD0E0742D5D9E9D049D774D02A6F9A
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

76:25:38:43:95:09:C4:11:C4:37:D3:C5:67:56:3E:13:78:67:12:81:FC:4A:14:64:AD:D0:31:87:08:43:67:6E
Certificate extensions & PEM
keyUsage
Digital Signature, Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
basicConstraints
CA:TRUE, pathlen:0
subjectKeyIdentifier
0D:98:C0:73:7F:AB:BD:BD:D9:47:4B:49:AD:0A:4A:0C:AC:3E:C7:7C
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 CA Issuers - URI:http://secure.globalsign.com/cacert/root-r3.crt
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-----

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

View certificate JSON

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