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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

seed.net.tw · 203.69.82.103:443

Unverified
Certificate verification failed. These are unverified certificate details presented by the server. SSL operation failed with code 1. OpenSSL Error messages: error:0A000086:SSL routines::certificate verify failed
The certificate has expired.

Certificate verification failed

Subject
C=TW ST=Taiwan L=Taipei O=OPENFIND INFORMATION TECHNOLOGY INC. CN=seed.net.tw
Issuer
C=TW O=TAIWAN-CA CN=TWCA Secure SSL Certification Authority
Valid from
2025-04-15T09:52:46+00:00
Expires
2026-05-10T15:59:59+00:00
Days remaining
-136
Serial (hex)
47E900000007F72412B7A225EBE9122A
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:seed.net.tw

SHA-256 fingerprint

1B:62:4E:CB:08:EE:61:EE:F0:70:D9:5E:F2:30:0E:A7:AD:10:C3:58:CA:D2:92:E0:9B:A0:53:21:31:34:8C:81
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
BC:F8:1F:D7:B3:3B:F6:F1:4A:5F:61:F3:FE:2B:0B:C5:93:B3:A1:ED:85:41:47:5C:77:85:00:1D:04:3E:19:DD
crlDistributionPoints
Full Name: URI:http://sslserver.twca.com.tw/sslserver/Securessl_revoke_sha2_2023G3.crl
subjectAltName
DNS:seed.net.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 : 64:11:C4:6C:A4:12:EC:A7:89:1C:A2:02:2E:00:BC:AB: 4F:28:07:D4:1E:35:27:AB:EA:FE:D5:03:C9:7D:CD:F0 Timestamp : Apr 15 09:52:47.128 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:F2:02:FF:A5:5D:85:54:98:05:1A:E7: B5:26:7F:2D:22:9F:9D:D9:56:5E:6B:41:08:64:EE:97: EF:77:98:78:2C:02:21:00:E1:CC:C0:5E:E6:38:3C:B2: 5E:E2:36:D5:80:38:38:AF:D3:3F:80:47:89:6E:91:8D: AB:A9:90:EC:32:C1:9E:BB Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 0E:57:94:BC:F3:AE:A9:3E:33:1B:2C:99:07:B3:F7:90: DF:9B:C2:3D:71:32:25:DD:21:A9:25:AC:61:C5:4E:21 Timestamp : Apr 15 09:52:47.133 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:E1:2C:AD:02:94:04:7C:2E:5E:A8:E3: 17:EA:E3:C4:BB:E9:3C:AF:A6:58:F2:F5:06:BB:31:98: 92:79:AA:DE:3C:02:21:00:A5:05:2E:03:DB:6B:86:84: 46:63:28:58:31:DE:4E:B0:09:0B:F6:BA:1C:DF:08:59: 7B:AE:41:9E:36:6E:9C:48 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 49:9C:9B:69:DE:1D:7C:EC:FC:36:DE:CD:87:64:A6:B8: 5B:AF:0A:87:80:19:D1:55:52:FB:E9:EB:29:DD:F8:C3 Timestamp : Apr 15 09:52:47.189 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:D5:8C:5F:69:27:59:8B:15:EE:B2:CF: 00:24:4F:63:0C:67:58:99:34:74:A8:D1:A8:A8:49:22: 54:20:B4:22:3E:02:21:00:E5:7A:60:9A:7F:4B:1A:A8: 1D:B4:35:24:1F:16:3C:06:BA:E4:F6:E3:4F:7C:CC:A9: 44:80:A9:B2:65:1F:F9:0B Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 19:86:D4:C7:28:AA:6F:FE:BA:03:6F:78:2A:4D:01:91: AA:CE:2D:72:31:0F:AE:CE:5D:70:41:2D:25:4C:C7:D4 Timestamp : Apr 15 09:52:47.170 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:5B:91:56:4F:52:64:C5:40:3F:B2:90:97: 4D:C6:76:2B:3D:DC:50:1B:EF:F4:DA:F6:47:6E:2A:BA: 9E:0B:9C:3D:02:21:00:E4:D9:67:9B:88:3F:BE:BB:27: 75:C2:1C:10:8F:7A:A0:AD:4B:67:73:79:37:40:7D:83: BE:5D:FC:E8:FA:D9:95 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 : Apr 15 09:52:47.086 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:4A:9E:76:75:F7:E5:63:50:BF:B8:55:D8: D3:7C:94:D4:9C:53:A3:AD:B7:30:00:0E:6F:AC:89:CD: 64:50:E3:E4:02:21:00:8D:3E:C7:90:4F:26:E3:89:CF: AE:36:93:EE:62:C4:F8:F4:0B:DC:DE:56:19:BD:14:B4: 61:6C:95:AA:FC:08:BB
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-09-23T13:28:42+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
1484
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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