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

ssu.ac.kr · 133.186.209.224:443

Verified

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

Subject
C=KR ST=Seoul L=Dongjak District O=Soongsil University CN=*.ssu.ac.kr
Issuer
C=US O=DigiCert Inc OU=www.digicert.com CN=Thawte TLS RSA CA G1
Valid from
2026-07-24T00:00:00+00:00
Expires
2027-02-07T23:59:59+00:00
Days remaining
138
Serial (hex)
04BA1A2D049195A1A3408D8ED4DE7451
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:*.ssu.ac.kr, DNS:ssu.ac.kr

SHA-256 fingerprint

04:C5:0A:55:18:B5:3C:A2:C7:D3:0B:7F:C8:28:C8:A8:16:E1:30:50:82:C8:64:61:FF:D9:7A:BD:AE:87:2B:DE
Certificate extensions & PEM
authorityKeyIdentifier
A5:8C:FE:32:CC:EB:0F:2C:D4:19:C6:08:B8:00:24:88:5D:C3:C5:B7
subjectKeyIdentifier
F1:1A:53:7B:DC:41:77:10:FD:46:84:DA:9D:C0:70:90:A1:A4:17:DB
subjectAltName
DNS:*.ssu.ac.kr, DNS:ssu.ac.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
crlDistributionPoints
Full Name: URI:http://cdp.thawte.com/ThawteTLSRSACAG1.crl
authorityInfoAccess
OCSP - URI:http://status.thawte.com CA Issuers - URI:http://cacerts.thawte.com/ThawteTLSRSACAG1.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 : Jul 24 01:38:06.555 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:8D:DF:6E:32:3D:46:7D:05:50:E9:24: A4:80:23:86:1C:13:AA:49:FF:16:46:2D:8F:80:C1:98: 23:AF:89:C6:10:02:20:26:FC:10:0F:E6:CD:54:F6:98: 08:BC:B3:E3:C1:01:E3:38:7F:17:61:49:D0:B8:1F:D4: 25:EE:F3:3A:ED:61:C8 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 : Jul 24 01:38:06.515 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:4E:97:F3:0B:FA:A1:A4:C1:1C:D1:9C:8A: 9C:39:45:B7:27:80:DC:DF:3C:2B:8B:42:A4:FB:40:2B: C0:B9:C2:8C:02:20:2B:26:87:5C:F8:1C:72:EA:5D:F3: 47:AE:63:2A:96:02:4C:E0:71:AB:2D:6D:59:7E:A2:87: 75:51:11:81:D5:96 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 24 01:38:06.716 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:8D:E0:BB:0F:70:5F:CC:6A:EC:9C:44: 09:2B:79:75:69:B7:9B:63:53:13:E1:8D:6B:DD:69:4C: E7:18:BA:3F:04:02:21:00:CB:25:37:6F:43:9E:77:84: 60:70:61:36:2D:F5:48:11:0B:FE:7A:D5:AF:AB:22:52: E2:35:AB:25:54:9D:D6:21
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: ECDHE-RSA-AES256-GCM-SHA384 · Checked 2026-09-22T16:49:59+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=US O=DigiCert Inc OU=www.digicert.com CN=Thawte TLS RSA CA G1
Issuer
C=US O=DigiCert Inc OU=www.digicert.com CN=DigiCert Global Root G2
Valid from
2017-11-02T12:24:25+00:00
Expires
2027-11-02T12:24:25+00:00
Days remaining
405
Serial (hex)
090EE8C5DE5BFA62D2AE2FF7097C4857
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

4B:CC:5E:23:4F:E8:1E:DE:4E:AF:88:3A:A1:9C:31:33:5B:0B:26:E8:5E:06:6B:99:45:E4:CB:61:53:EB:20:C2
Certificate extensions & PEM
subjectKeyIdentifier
A5:8C:FE:32:CC:EB:0F:2C:D4:19:C6:08:B8:00:24:88:5D:C3:C5:B7
authorityKeyIdentifier
4E:22:54:20:18:95:E6:E3:6E:E6:0F:FA:FA:B9:12:ED:06:17:8F:39
keyUsage
Digital Signature, Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
basicConstraints
CA:TRUE, pathlen:0
authorityInfoAccess
OCSP - URI:http://ocsp.digicert.com
crlDistributionPoints
Full Name: URI:http://crl3.digicert.com/DigiCertGlobalRootG2.crl
certificatePolicies
Policy: X509v3 Any Policy CPS: https://www.digicert.com/CPS
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Chain certificate 2

Subject
C=US O=DigiCert Inc OU=www.digicert.com CN=DigiCert Global Root G2
Issuer
C=US O=DigiCert Inc OU=www.digicert.com CN=DigiCert Global Root G2
Valid from
2013-08-01T12:00:00+00:00
Expires
2038-01-15T12:00:00+00:00
Days remaining
4132
Serial (hex)
033AF1E6A711A9A0BB2864B11D09FAE5
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

CB:3C:CB:B7:60:31:E5:E0:13:8F:8D:D3:9A:23:F9:DE:47:FF:C3:5E:43:C1:14:4C:EA:27:D4:6A:5A:B1:CB:5F
Certificate extensions & PEM
basicConstraints
CA:TRUE
keyUsage
Digital Signature, Certificate Sign, CRL Sign
subjectKeyIdentifier
4E:22:54:20:18:95:E6:E3:6E:E6:0F:FA:FA:B9:12:ED:06:17:8F:39
-----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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