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

kt.com · 14.63.149.115:443

Verified

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

Subject
C=KR ST=Gyeonggi-do O=KT Corporation CN=kt.com
Issuer
C=GB ST=Greater Manchester L=Salford O=Sectigo Limited CN=Sectigo RSA Organization Validation Secure Server CA
Valid from
2025-10-20T00:00:00+00:00
Expires
2026-11-20T23:59:59+00:00
Days remaining
61
Serial (hex)
2392095D7A6239E2342F57E6AB87CF5E
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:kt.com, DNS:www.kt.com

SHA-256 fingerprint

B3:9A:DF:6E:B5:A4:09:7C:7B:39:77:9C:D8:3A:86:8C:58:26:55:60:76:C0:AE:30:CF:4B:8D:EC:94:54:C8:40
Certificate extensions & PEM
authorityKeyIdentifier
17:D9:D6:25:27:67:F9:31:C2:49:43:D9:30:36:44:8C:6C:A9:4F:EB
subjectKeyIdentifier
11:4A:C6:AD:DA:8B:0F:7C:A2:4D:32:EE:1D:25:F7:95:AD:CF:9C:30
keyUsage
Digital Signature, Key Encipherment
basicConstraints
CA:FALSE
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
certificatePolicies
Policy: 1.3.6.1.4.1.6449.1.2.1.3.4 CPS: https://sectigo.com/CPS Policy: 2.23.140.1.2.2
crlDistributionPoints
Full Name: URI:http://crl.sectigo.com/SectigoRSAOrganizationValidationSecureServerCA.crl
authorityInfoAccess
CA Issuers - URI:http://crt.sectigo.com/SectigoRSAOrganizationValidationSecureServerCA.crt OCSP - URI:http://ocsp.sectigo.com
subjectAltName
DNS:kt.com, DNS:www.kt.com
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : D8:09:55:3B:94:4F:7A:FF:C8:16:19:6F:94:4F:85:AB: B0:F8:FC:5E:87:55:26:0F:15:D1:2E:72:BB:45:4B:14 Timestamp : Oct 20 01:27:24.904 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:06:63:3E:B5:7B:1F:54:F7:56:34:5F:89: 3C:13:66:1A:9F:0B:72:29:2C:DB:2E:3E:0B:E2:0E:5A: B9:DD:C9:14:02:21:00:E3:C3:2E:4B:0C:F9:4B:4B:1D: B9:EC:FD:EE:3E:B1:A3:02:95:19:C1:C4:4B:63:CE:34: 27:38:85:A7:B7:08:C3 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : AF:67:88:3B:57:B0:4E:DD:8F:A6:D9:7E:F6:2E:A8:EB: 81:0A:C7:71:60:F0:24:5E:55:D6:0C:2F:E7:85:87:3A Timestamp : Oct 20 01:27:24.987 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:21:8A:54:F3:E8:82:C3:F2:25:BA:37:6A: C4:C6:0B:7D:00:A3:E5:F2:25:B3:8D:2D:B6:44:5B:16: F3:F9:37:24:02:21:00:A2:02:55:0B:9B:84:ED:9A:6D: BA:27:7B:65:1A:D6:01:77:F0:7A:1F:01:E8:87:C5:55: AF:6A:13:34:DD:5F:A5 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : AC:AB:30:70:6C:EB:EC:84:31:F4:13:D2:F4:91:5F:11: 1E:42:24:43:B1:F2:A6:8C:4F:3C:2B:3B:A7:1E:02:C3 Timestamp : Oct 20 01:27:25.036 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:B4:C5:C6:B2:D5:5E:44:AD:92:F4:F0: 4F:89:D3:AC:5A:B6:6D:5C:4B:36:07:10:77:A2:09:6B: 7F:3B:CE:6E:F7:02:21:00:A2:F2:50:20:90:13:10:CE: 81:E8:D3:6D:09:FD:35:76:5A:27:A2:55:A2:56:57:41: 99:8B:98:2D:57:96:15:FD
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-09-20T09:48:17+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=GB ST=Greater Manchester L=Salford O=Sectigo Limited CN=Sectigo RSA Organization Validation Secure Server CA
Issuer
C=US ST=New Jersey L=Jersey City O=The USERTRUST Network CN=USERTrust RSA Certification Authority
Valid from
2018-11-02T00:00:00+00:00
Expires
2030-12-31T23:59:59+00:00
Days remaining
1563
Serial (hex)
137D539CAA7C31A9A433701968847A8D
Signature
RSA-SHA384
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

72:A3:4A:C2:B4:24:AE:D3:F6:B0:B0:47:55:B8:8C:C0:27:DC:CC:80:6F:DD:B2:2B:4C:D7:C4:77:73:97:3E:C0
Certificate extensions & PEM
authorityKeyIdentifier
53:79:BF:5A:AA:2B:4A:CF:54:80:E1:D8:9B:C0:9D:F2:B2:03:66:CB
subjectKeyIdentifier
17:D9:D6:25:27:67:F9:31:C2:49:43:D9:30:36:44:8C:6C:A9:4F:EB
keyUsage
Digital Signature, Certificate Sign, CRL Sign
basicConstraints
CA:TRUE, pathlen:0
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
certificatePolicies
Policy: X509v3 Any Policy Policy: 2.23.140.1.2.2
crlDistributionPoints
Full Name: URI:http://crl.usertrust.com/USERTrustRSACertificationAuthority.crl
authorityInfoAccess
CA Issuers - URI:http://crt.usertrust.com/USERTrustRSAAddTrustCA.crt OCSP - URI:http://ocsp.usertrust.com
-----BEGIN CERTIFICATE-----
MIIGGTCCBAGgAwIBAgIQE31TnKp8MamkM3AZaIR6jTANBgkqhkiG9w0BAQwFADCB
iDELMAkGA1UEBhMCVVMxEzARBgNVBAgTCk5ldyBKZXJzZXkxFDASBgNVBAcTC0pl
cnNleSBDaXR5MR4wHAYDVQQKExVUaGUgVVNFUlRSVVNUIE5ldHdvcmsxLjAsBgNV
BAMTJVVTRVJUcnVzdCBSU0EgQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkwHhcNMTgx
MTAyMDAwMDAwWhcNMzAxMjMxMjM1OTU5WjCBlTELMAkGA1UEBhMCR0IxGzAZBgNV
BAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEYMBYGA1UE
ChMPU2VjdGlnbyBMaW1pdGVkMT0wOwYDVQQDEzRTZWN0aWdvIFJTQSBPcmdhbml6
YXRpb24gVmFsaWRhdGlvbiBTZWN1cmUgU2VydmVyIENBMIIBIjANBgkqhkiG9w0B
AQEFAAOCAQ8AMIIBCgKCAQEAnJMCRkVKUkiS/FeN+S3qU76zLNXYqKXsW2kDwB0Q
9lkz3v4HSKjojHpnSvH1jcM3ZtAykffEnQRgxLVK4oOLp64m1F06XvjRFnG7ir1x
on3IzqJgJLBSoDpFUd54k2xiYPHkVpy3O/c8Vdjf1XoxfDV/ElFw4Sy+BKzL+k/h
fGVqwECn2XylY4QZ4ffK76q06Fha2ZnjJt+OErK43DOyNtoUHZZYQkBuCyKFHFEi
rsTIBkVtkuZntxkj5Ng2a4XQf8dS48+wdQHgibSov4o2TqPgbOuEQc6lL0giE5dQ
YkUeCaXMn2xXcEAG2yDoG9bzk4unMp63RBUJ16/9fAEc2wIDAQABo4IBbjCCAWow
HwYDVR0jBBgwFoAUU3m/WqorSs9UgOHYm8Cd8rIDZsswHQYDVR0OBBYEFBfZ1iUn
Z/kxwklD2TA2RIxsqU/rMA4GA1UdDwEB/wQEAwIBhjASBgNVHRMBAf8ECDAGAQH/
AgEAMB0GA1UdJQQWMBQGCCsGAQUFBwMBBggrBgEFBQcDAjAbBgNVHSAEFDASMAYG
BFUdIAAwCAYGZ4EMAQICMFAGA1UdHwRJMEcwRaBDoEGGP2h0dHA6Ly9jcmwudXNl
cnRydXN0LmNvbS9VU0VSVHJ1c3RSU0FDZXJ0aWZpY2F0aW9uQXV0aG9yaXR5LmNy
bDB2BggrBgEFBQcBAQRqMGgwPwYIKwYBBQUHMAKGM2h0dHA6Ly9jcnQudXNlcnRy
dXN0LmNvbS9VU0VSVHJ1c3RSU0FBZGRUcnVzdENBLmNydDAlBggrBgEFBQcwAYYZ
aHR0cDovL29jc3AudXNlcnRydXN0LmNvbTANBgkqhkiG9w0BAQwFAAOCAgEAThNA
lsnD5m5bwOO69Bfhrgkfyb/LDCUW8nNTs3Yat6tIBtbNAHwgRUNFbBZaGxNh10m6
pAKkrOjOzi3JKnSj3N6uq9BoNviRrzwB93fVC8+Xq+uH5xWo+jBaYXEgscBDxLmP
bYox6xU2JPti1Qucj+lmveZhUZeTth2HvbC1bP6mESkGYTQxMD0gJ3NR0N6Fg9N3
OSBGltqnxloWJ4Wyz04PToxcvr44APhL+XJ71PJ616IphdAEutNCLFGIUi7RPSRn
R+xVzBv0yjTqJsHe3cQhifa6ezIejpZehEU4z4CqN2mLYBd0FUiRnG3wTqN3yhsc
SPr5z0noX0+FCuKPkBurcEya67emP7SsXaRfz+bYipaQ908mgWB2XQ8kd5GzKjGf
FlqyXYwcKapInI5v03hAcNt37N3j0VcFcC3mSZiIBYRiBXBWdoY5TtMibx3+bfEO
s2LEPMvAhblhHrrhFYBZlAyuBbuMf1a+HNJav5fyakywxnB2sJCNwQs2uRHY1ihc
6k/+JLcYCpsM0MF8XPtpvcyiTcaQvKZN8rG61ppnW5YCUtCC+cQKXA0o4D/I+pWV
idWkvklsQLI+qGu41SWyxP7x09fn1txDAXYw+zuLXfdKiXyaNb78yvBXAfCNP6CH
MntHWpdLgtJmwsQt6j8k9Kf5qLnjatkYYaA7jBU=
-----END CERTIFICATE-----

Chain certificate 2

Subject
C=US ST=New Jersey L=Jersey City O=The USERTRUST Network CN=USERTrust RSA Certification Authority
Issuer
C=US ST=New Jersey L=Jersey City O=The USERTRUST Network CN=USERTrust RSA Certification Authority
Valid from
2010-02-01T00:00:00+00:00
Expires
2038-01-18T23:59:59+00:00
Days remaining
4138
Serial (hex)
01FD6D30FCA3CA51A81BBC640E35032D
Signature
RSA-SHA384
Public key
RSA 4096

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

E7:93:C9:B0:2F:D8:AA:13:E2:1C:31:22:8A:CC:B0:81:19:64:3B:74:9C:89:89:64:B1:74:6D:46:C3:D4:CB:D2
Certificate extensions & PEM
subjectKeyIdentifier
53:79:BF:5A:AA:2B:4A:CF:54:80:E1:D8:9B:C0:9D:F2:B2:03:66:CB
keyUsage
Certificate Sign, CRL Sign
basicConstraints
CA:TRUE
-----BEGIN CERTIFICATE-----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XHlKYC6SQK5MNyosycdiyA5d9zZbyuAlJQG03RoHnHcAP9Dc1ew91Pq7P8yF1m9/
qS3fuQL39ZeatTXaw2ewh0qpKJ4jjv9cJ2vhsE/zB+4ALtRZh8tSQZXq9EfX7mRB
VXyNWQKV3WKdwrnuWih0hKWbt5DHDAff9Yk2dDLWKMGwsAvgnEzDHNb842m1R0aB
L6KCq9NjRHDEjf8tM7qtj3u1cIiuPhnPQCjY/MiQu12ZIvVS5ljFH4gxQ+6IHdfG
jjxDah2nGN59PRbxYvnKkKj9
-----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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