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

ut.ac.kr · 210.119.144.25:443

Verified

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

Subject
C=KR ST=Chungcheongbuk-do L=Chungju-si O=Korea National University Of Transportation CN=*.ut.ac.kr
Issuer
C=US O=DigiCert Inc OU=www.digicert.com CN=Thawte TLS RSA CA G1
Valid from
2026-08-21T00:00:00+00:00
Expires
2027-03-07T23:59:59+00:00
Days remaining
165
Serial (hex)
0F417950703F08D3948534A7B675D847
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:*.ut.ac.kr, DNS:ut.ac.kr

SHA-256 fingerprint

52:02:1A:97:D6:1C:C4:86:60:1F:04:AD:9A:F2:0B:C1:BA:91:CB:21:B6:76:CC:F8:45:20:6B:D6:A3:61:A0:9A
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
E7:0E:03:E7:AE:B1:06:1B:38:C1:79:5F:E1:E3:85:DA:7D:49:A9:15
subjectAltName
DNS:*.ut.ac.kr, DNS:ut.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 : Aug 21 01:48:33.665 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:5F:3C:26:CA:CC:AF:07:C2:45:D9:A1:BF: 1C:A3:02:43:19:27:CC:2B:EC:DD:B0:25:51:9D:A6:97: 18:3D:32:8A:02:21:00:E1:5A:A4:A4:5F:94:4A:D6:EA: 21:09:8A:43:08:0A:4F:29:12:DE:82:17:14:C4:4A:86: B7:74:E8:6A:5E:A3:A8 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 21 01:48:33.687 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:59:A4:0A:C0:21:96:6A:F8:58:42:07:C2: 4B:32:0B:7D:6E:BF:06:41:E1:AF:3C:6D:06:DC:62:2F: FB:54:65:9E:02:21:00:CC:35:E7:6B:A7:E9:B7:63:AE: CF:34:F8:FC:61:5B:6C:9A:B7:F1:4E:22:CF:C6:E7:2A: 55:D2:EB:E9:4F:92:F8 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 21 01:48:33.801 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:95:AB:2E:E7:95:49:0F:E7:7D:9B:E2: 70:40:8C:75:2C:C9:B8:4B:A1:BE:EE:6E:38:E5:92:B1: 20:AA:ED:B1:C7:02:21:00:FC:71:1A:53:96:64:32:04: 3F:AB:8C:F7:3C:E7:DF:A5:59:A4:5F:BB:19:C9:B0:67: B8:F3:B3:3B:12:E9:A7:0F
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-09-23T10:48:00+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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