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

koren.kr · 203.255.248.43:443

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=koren.kr
Issuer
C=GB O=Sectigo Limited CN=Sectigo Public Server Authentication CA DV R36
Valid from
2026-06-24T00:00:00+00:00
Expires
2027-01-08T23:59:59+00:00
Days remaining
98
Serial (hex)
76501B0007EDD8BC4A75E1BA3DDA045A
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:koren.kr, DNS:www.koren.kr

SHA-256 fingerprint

A6:23:80:FB:30:DD:56:E3:FC:72:08:30:69:96:53:60:49:03:8D:3D:1E:BB:46:A9:65:AD:2C:EA:EB:24:D4:5E
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
CD:2D:C4:8E:4E:DC:8D:4F:30:CB:90:91:F4:56:5D:9D:FB:83:EF:E0
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:koren.kr, DNS:www.koren.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 : Jun 24 10:11:43.709 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:6F:6C:42:79:C3:08:B5:D5:3F:46:5B:AA: 62:8A:6D:75:63:68:5A:1D:CF:FE:E8:8B:4A:81:2C:A0: B8:A0:8A:8C:02:20:76:E5:EC:28:DE:EA:E1:0B:CD:EB: DA:6A:AB:54:34:20:13:09:85:8D:14:6B:95:58:B6:9E: EA:79:0C:54:21:C9 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 : Jun 24 10:11:44.565 2026 GMT Extensions: 00:00:05:00:04:71:1B:02 Signature : ecdsa-with-SHA256 30:45:02:20:38:67:8B:FE:87:72:62:99:C5:D3:C9:D8: 87:CA:DC:94:3F:AA:28:4B:92:A4:BB:90:F3:25:11:6F: 0D:76:14:4F:02:21:00:87:4F:CB:5C:CC:74:7D:E0:5F: BF:24:1D:5E:31:7D:51:37:D9:E8:56:D5:B8:13:94:9B: D8:40:FE:44:B3:EB:F7 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 : Jun 24 10:11:43.826 2026 GMT Extensions: 00:00:05:00:00:3E:C2:14 Signature : ecdsa-with-SHA256 30:45:02:21:00:BC:C1:AF:B3:A0:9E:54:BE:09:6C:44: A6:87:3C:1E:EF:BD:82:5B:DA:33:DC:49:72:B0:DC:0D: E1:06:85:B9:1B:02:20:30:F5:91:CA:4C:52:94:D9:30: DA:AC:FD:BE:08:20:3F:C7:46:22:20:28:92:37:53:2B: 4A:82:8F:FE:37:0A:0A
-----BEGIN CERTIFICATE-----
MIIGhjCCBO6gAwIBAgIQdlAbAAft2LxKdeG6PdoEWjANBgkqhkiG9w0BAQsFADBg
MQswCQYDVQQGEwJHQjEYMBYGA1UEChMPU2VjdGlnbyBMaW1pdGVkMTcwNQYDVQQD
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M+FD37OWPVyQhQBqjAu2pR6bcvAHcg1qDS5mrYLHvWRFmehQDTFZa3pbreTrXm6r
01Pzs1XjXRA/wrST8M5GgbYANGN8mz/SO0EeENjviQMH7sgkSP2e+sfS
-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-10-02T04:07:41+00:00

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

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