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

kisa.or.kr · 58.235.102.10:443

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
C=KR ST=Jeollanam-do L=Naju-si O=Korea Internet and Security Agency CN=*.kisa.or.kr
Issuer
C=US O=DigiCert Inc OU=www.digicert.com CN=GeoTrust TLS RSA CA G1
Valid from
2026-08-27T00:00:00+00:00
Expires
2027-03-13T23:59:59+00:00
Days remaining
152
Serial (hex)
0488682CF3AD9B7E121F516F2BFC9A79
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:*.kisa.or.kr, DNS:kisa.or.kr

SHA-256 fingerprint

EB:9E:6B:9D:BF:85:AF:66:8C:A6:C0:48:A6:91:DD:A5:CB:A1:78:FA:8E:DB:19:AF:EE:13:EE:23:50:8E:E2:73
Certificate extensions & PEM
authorityKeyIdentifier
94:4F:D4:5D:8B:E4:A4:E2:A6:80:FE:FD:D8:F9:00:EF:A3:BE:02:57
subjectKeyIdentifier
FD:28:FE:B5:3B:26:84:B0:5F:3B:53:6B:23:17:29:35:EF:80:B1:7D
subjectAltName
DNS:*.kisa.or.kr, DNS:kisa.or.kr
certificatePolicies
Policy: 2.23.140.1.2.2 CPS: http://www.digicert.com/CPS
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
crlDistributionPoints
Full Name: URI:http://cdp.geotrust.com/GeoTrustTLSRSACAG1.crl
authorityInfoAccess
OCSP - URI:http://status.geotrust.com CA Issuers - URI:http://cacerts.geotrust.com/GeoTrustTLSRSACAG1.crt
basicConstraints
CA:FALSE
ct_precert_scts
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 : Aug 27 01:20:12.262 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:34:E9:C0:5C:76:E2:2F:17:94:BC:2A:FC: 65:5D:75:B5:9A:AA:C1:4F:0C:BF:63:1E:99:44:DD:0B: B1:23:33:FF:02:20:10:F8:19:DE:FE:DF:10:33:E6:3B: E2:09:2A:5D:7A:D6:3C:AD:9C:85:68:CC:CD:E1:C9:F1: BE:D1:40:E9:D6:55 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : D6:D5:8D:A9:D0:17:53:F3:6A:4A:A0:C7:57:49:02:AF: EB:C7:DC:2C:D3:8C:D9:F7:64:C8:0C:89:19:1E:9F:02 Timestamp : Aug 27 01:20:12.160 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:1E:4B:B5:E1:6B:A7:AE:10:5E:3F:40:A1: BF:B3:21:3F:4A:97:61:C8:3C:6F:C2:6B:F4:C3:07:CD: B7:93:AF:5C:02:20:67:25:A2:02:BC:ED:81:ED:8A:2F: 87:79:F2:E5:76:52:09:D1:A8:41:56:0B:75:E6:28:69: 86:A2:3D:2C:FE:AB 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 : Aug 27 01:20:12.421 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:E5:FF:7B:83:15:67:25:5F:F0:13:B3: 88:E7:82:AE:5E:68:98:51:8E:BC:F2:83:3A:BC:DA:57: 3B:66:8F:06:7A:02:21:00:98:7D:74:1A:B3:1A:AC:3F: 1A:88:6D:AB:8F:10:61:FF:CD:F6:82:A5:0E:B4:02:31: 56:A7:78:BF:02:D7:03:4C
-----BEGIN CERTIFICATE-----
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MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-10-12T00:58:07+00:00

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

View certificate JSON

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