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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

ntou.edu.tw · 140.121.140.61:443

Verified

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

Subject
C=TW ST=Taiwan L=Keelung O=National Taiwan Ocean University CN=*.ntou.edu.tw
Issuer
C=TW O=TAIWAN-CA CN=TWCA Secure SSL Certification Authority
Valid from
2025-11-03T09:49:17+00:00
Expires
2026-12-01T15:59:59+00:00
Days remaining
44
Serial (hex)
47E90000000899CD17BD0A9FE4DD8268
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:*.ntou.edu.tw, DNS:ntou.edu.tw

SHA-256 fingerprint

20:E2:E3:BA:94:3D:74:BB:3A:6F:AF:06:E2:B7:52:D8:0A:A6:4D:60:C2:14:95:09:3E:A2:EF:A0:BE:15:74:64
Certificate extensions & PEM
authorityKeyIdentifier
92:E7:FA:62:16:71:8C:F3:97:71:42:C6:06:A7:E0:46:61:4B:5C:B6
subjectKeyIdentifier
69:AD:61:7F:57:04:3F:7A:25:19:EE:38:96:59:28:1A:6C:3E:38:C2:46:A8:9D:0D:CE:7D:62:DB:D6:54:37:FC
crlDistributionPoints
Full Name: URI:http://sslserver.twca.com.tw/sslserver/Securessl_revoke_sha2_2023G3.crl
subjectAltName
DNS:*.ntou.edu.tw, DNS:ntou.edu.tw
authorityInfoAccess
CA Issuers - URI:http://sslserver.twca.com.tw/cacert/secure_sha2_2023G3.crt OCSP - URI:http://twcasslocsp.twca.com.tw/
certificatePolicies
Policy: 1.3.6.1.4.1.40869.1.1.21 CPS: https://www.twca.com.tw/ Policy: 2.23.140.1.2.2
basicConstraints
CA:FALSE
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : D7:6D:7D:10:D1:A7:F5:77:C2:C7:E9:5F:D7:00:BF:F9: 82:C9:33:5A:65:E1:D0:B3:01:73:17:C0:C8:C5:69:77 Timestamp : Nov 3 09:49:18.233 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:92:05:63:7F:3C:51:B1:DB:D2:8E:30: 2C:9E:31:8B:95:30:26:00:E1:18:6A:34:1F:10:52:F2: D5:29:E6:FB:BF:02:20:4A:79:84:15:9F:EB:C2:8F:5D: C4:77:91:0D:92:32:9C:73:42:17:9D:8B:EB:08:5C:3D: EF:3F:FA:AE:DE:15:B8 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 : Nov 3 09:49:18.329 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:C0:A7:68:C3:3A:9F:AB:BE:6B:12:62: 66:C9:13:55:C0:21:5F:72:0E:B2:DF:EC:C3:79:77:8F: EB:CD:64:FF:AF:02:21:00:A4:85:A8:A7:67:79:60:CA: 2F:3C:0D:0B:C4:D8:95:37:D8:A6:00:25:28:D6:23:E2: 22:84:01:15:80:A3:FD:03 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 74:DB:9D:58:F7:D4:7E:9D:FD:78:7A:16:2A:99:1C:18: CF:69:8D:A7:C7:29:91:8C:9A:18:B0:45:0D:BA:44:BC Timestamp : Nov 3 09:49:18.275 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:07:54:52:F9:86:25:D7:84:01:6B:80:A6: B3:B9:6B:04:07:01:EB:8B:18:56:5B:4F:E2:22:D6:9C: FE:3C:66:C1:02:20:36:CC:7D:0D:BB:49:E6:CD:36:62: D3:5E:C0:CE:42:06:5F:2E:D2:A9:F6:5E:B2:FA:CF:73: 6D:C5:EF:B5:4C:E3
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-10-17T16:48:25+00:00

Server-presented chain · 1 additional certificate

Chain certificate 1

Subject
C=TW O=TAIWAN-CA CN=TWCA Secure SSL Certification Authority
Issuer
C=TW O=TAIWAN-CA OU=Root CA CN=TWCA Global Root CA
Valid from
2023-10-16T09:01:04+00:00
Expires
2030-10-16T15:59:59+00:00
Days remaining
1459
Serial (hex)
400134B3680000000000000CD0AA08EC
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

1A:2C:75:FD:09:6E:04:99:E9:FF:6A:C7:4E:52:6F:61:EA:AE:3E:DF:C8:C2:EA:44:36:FE:E0:C2:4D:8B:7D:0E
Certificate extensions & PEM
authorityKeyIdentifier
48:DB:CD:DE:8E:E9:49:72:5A:88:E8:B1:D8:3D:07:B3:B9:6B:66:50
subjectKeyIdentifier
92:E7:FA:62:16:71:8C:F3:97:71:42:C6:06:A7:E0:46:61:4B:5C:B6
keyUsage
Digital Signature, Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
certificatePolicies
Policy: 1.3.6.1.4.1.40869.1.1.21 CPS: https://www.twca.com.tw/ Policy: 2.23.140.1.2.2
crlDistributionPoints
Full Name: URI:http://rootca.twca.com.tw/TWCARCA/global_revoke_4096.crl
basicConstraints
CA:TRUE, pathlen:0
authorityInfoAccess
CA Issuers - URI:http://sslserver.twca.com.tw/cacert/root4096.crt OCSP - URI:http://rootocsp.twca.com.tw/
-----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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