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

edudns-c2.edu.tw · 140.111.233.4:443

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

Certificate verification failed

Subject
C=US ST=California L=Sunnyvale O=Infoblox OU=Engineering CN=edudns-c2.edu.tw
Issuer
C=US ST=California L=Sunnyvale O=Infoblox OU=Engineering CN=edudns-c2.edu.tw
Valid from
2026-10-13T04:35:36+00:00
Expires
2027-10-13T04:35:36+00:00
Days remaining
340
Serial (hex)
363316CA774034B5E01B354C8D7A6568
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

IP Address:140.111.233.4, IP Address:2001:288:0:233:0:0:0:4, DNS:edudns-c2.edu.tw

SHA-256 fingerprint

1D:FF:31:98:A9:21:48:29:56:32:83:B1:A3:59:6C:5E:4D:42:10:4E:70:01:01:B3:B9:E7:1E:CC:22:6D:CA:AE
Certificate extensions & PEM
subjectAltName
IP Address:140.111.233.4, IP Address:2001:288:0:233:0:0:0:4, DNS:edudns-c2.edu.tw
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-11-07T03:33:01+00:00

One endpoint on port 443. Server-presented chain; no revocation, OCSP, CT or full TLS security scan.

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