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

kmu.ac.kr · 203.247.29.160:443

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
CN=*.kmu.ac.kr
Issuer
C=GB O=Sectigo Limited CN=Sectigo Public Server Authentication CA DV R36
Valid from
2026-07-06T00:00:00+00:00
Expires
2027-01-20T23:59:59+00:00
Days remaining
69
Serial (hex)
762AAFE06595F6D06E3D7A5F84C0153A
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:*.kmu.ac.kr, DNS:kmu.ac.kr

SHA-256 fingerprint

EF:0C:30:D7:33:E5:29:B4:A0:DD:5D:0D:D0:D0:0A:9A:D5:04:56:2D:0D:1D:E7:69:A5:F0:FC:38:D8:35:0C:BD
Certificate extensions & PEM
authorityKeyIdentifier
68:C0:12:16:18:0E:AF:CE:F6:87:A6:32:57:A3:46:51:5D:CB:07:27
subjectKeyIdentifier
45:A1:7B:F0:60:E9:61:D5:DD:33:6D:FF:F8:7F:F0:32:D2:3A:DD:FA
keyUsage
Digital Signature, Key Encipherment
basicConstraints
CA:FALSE
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
certificatePolicies
Policy: 1.3.6.1.4.1.6449.1.2.2.7 CPS: https://sectigo.com/CPS Policy: 2.23.140.1.2.1
authorityInfoAccess
CA Issuers - URI:http://crt.sectigo.com/SectigoPublicServerAuthenticationCADVR36.crt OCSP - URI:http://ocsp.sectigo.com
subjectAltName
DNS:*.kmu.ac.kr, DNS:kmu.ac.kr
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 : Jul 6 00:28:15.441 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:30:B8:1F:F2:EA:52:F3:3A:F4:84:8B:2D: 87:7A:26:6E:F9:79:C4:29:2C:B9:20:DA:7B:3C:42:19: EA:9B:42:AD:02:21:00:AD:BB:95:7C:16:61:5C:99:61: 8A:98:57:67:E2:C6:2C:8D:61:FC:2C:25:92:74:0E:23: DA:EB:AE:30:88:5B:40 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 8E:CA:47:0B:AC:DE:6A:F3:A2:06:B0:A4:7A:84:B7:46: FE:1F:C6:BF:95:3E:25:E6:9B:4E:E4:02:48:F3:C6:E8 Timestamp : Jul 6 00:28:16.255 2026 GMT Extensions: 00:00:05:00:05:48:BF:9C Signature : ecdsa-with-SHA256 30:46:02:21:00:EC:EA:14:1B:44:E3:AB:4B:DF:93:AD: CC:A4:91:E9:CC:9B:30:F9:D7:59:24:FA:1C:04:44:EC: EE:42:E9:85:FE:02:21:00:91:26:D9:B5:4B:23:F3:B8: 09:72:42:9A:2F:F0:19:16:0C:DE:10:CC:DC:F5:C1:EF: 31:FC:D0:D5:5A:11:E8:96 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 59:6E:6C:33:86:94:B2:59:72:A2:56:C8:A0:E8:DD:90: 4A:76:E8:08:3D:DA:87:3B:01:08:38:28:14:3C:EE:59 Timestamp : Jul 6 00:28:15.631 2026 GMT Extensions: 00:00:05:00:00:45:CE:CD Signature : ecdsa-with-SHA256 30:44:02:20:6E:9B:B7:D8:15:45:49:A0:4A:3D:DD:17: DE:6A:99:DF:6F:7A:E5:8D:68:77:97:3E:35:D3:E3:88: 52:7B:1C:3F:02:20:07:61:50:FB:12:28:2A:FA:E5:4E: 56:B1:EC:71:14:71:75:34:C2:B6:08:6C:50:E7:FF:BA: A0:15:A2:AB:89:FB
-----BEGIN CERTIFICATE-----
MIIGijCCBPKgAwIBAgIQdiqv4GWV9tBuPXpfhMAVOjANBgkqhkiG9w0BAQsFADBg
MQswCQYDVQQGEwJHQjEYMBYGA1UEChMPU2VjdGlnbyBMaW1pdGVkMTcwNQYDVQQD
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BAMARjBEAiBum7fYFUVJoEo93Rfeapnfb3rljWh3lz410+OIUnscPwIgB2FQ+xIo
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apHhPUnQFjsfEooNJ5yUebdA7Yoq2jpCRXi1lbTnsCdJPujQmGDgsJr/N2+r8LiU
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p2oHPQqTBTPPebqf5SF4XLpUibSAPPGpnmp5/BKDqAHWrL/sVUNDI5g+tU2b1XNF
o76v6xHaT+SgAdk8zZmqqjMRlKF3pT14liY6Z5IxKLl3cWJ5JvZLWfbBUJH1jYbU
yNQexzQ6Pt/5XOsO6ZLmSBQUWgUMZbqUsYrpKf5M3x+aO6dkEz1roBidv8UkUA==
-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-11-12T19:52:27+00:00

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

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