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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

mg2.ntust.edu.tw · 140.118.31.97:443

Verified

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

Subject
C=TW ST=Taiwan L=Taipei O=National Taiwan University of Science and Technology CN=*.ntust.edu.tw
Issuer
C=TW O=TAIWAN-CA CN=TWCA Secure SSL Certification Authority
Valid from
2026-01-21T05:27:05+00:00
Expires
2027-02-18T15:59:59+00:00
Days remaining
118
Serial (hex)
47EA00000008D0966C18B9CD8F43AAD9
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:*.ntust.edu.tw, DNS:ntust.edu.tw

SHA-256 fingerprint

F8:E5:97:C6:AA:14:1A:0C:DC:F6:F9:1B:68:F9:4F:AB:08:35:A4:5F:85:B0:42:46:20:DF:21:CC:EC:89:DF:1A
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
54:63:E5:86:65:21:77:9E:B4:93:2F:AC:2B:55:9B:CD:EE:66:5A:C6:94:97:42:6A:FC:A1:2C:8F:B8:A5:01:AF
crlDistributionPoints
Full Name: URI:http://sslserver.twca.com.tw/sslserver/Securessl_revoke_sha2_2023G3.crl
subjectAltName
DNS:*.ntust.edu.tw, DNS:ntust.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 : 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 : Jan 21 05:27:07.079 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:83:E4:91:23:61:FE:5B:CA:7F:04:B1: 73:7E:BC:F6:35:89:C5:5A:9E:4F:43:E4:67:AC:29:B9: 88:F3:BF:29:E9:02:21:00:C7:CA:5E:F8:90:C5:55:4C: B1:03:35:F8:DD:46:FF:6D:EC:EB:3C:DA:D9:44:3E:7B: 6E:73:34:4D:FD:FB:B9:94 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 8E:CA:47:0B:AC:DE:6A:F3:A2:06:B0:A4:7A:84:B7:46: FE:1F:C6:BF:95:3E:25:E6:9B:4E:E4:02:48:F3:C6:E8 Timestamp : Jan 21 05:27:07.186 2026 GMT Extensions: 00:00:05:00:01:AA:86:04 Signature : ecdsa-with-SHA256 30:45:02:20:48:BD:D0:82:E1:EE:62:89:A3:18:15:08: 41:30:00:F7:D5:64:6B:DF:BA:37:F3:FE:9A:35:1D:5F: C7:35:C6:B5:02:21:00:B1:D8:A2:04:CF:4E:DD:61:1C: 8B:07:6B:84:D3:74:F0:64:27:FF:5B:72:AF:A3:7B:A6: 58:D9:23:48:D9:1F:1D 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 : Jan 21 05:27:06.390 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:E5:44:8D:37:38:90:1D:9A:EE:E3:92: E2:A7:CF:D5:32:B7:04:69:9B:8D:21:3F:6F:8C:70:3B: 37:29:8E:5C:1B:02:21:00:D7:5E:4A:C6:7D:8E:DE:08: 44:1E:43:9B:E2:73:6A:DD:C9:E2:58:F8:E5:83:49:F5: E2:80:83:64:E3:EF:4E:3A
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-10-22T16:00:56+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
1454
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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