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

mg4.so-net.net.tw · 27.105.63.64:443

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=TW ST=Taiwan L=Taipei O=TEST Corp OU=IT Department CN=mail.example.com.tw emailAddress=admin@mail.example.com.tw
Issuer
C=TW ST=Taiwan L=Taipei O=TEST Corp OU=IT Department CN=mail.example.com.tw emailAddress=admin@mail.example.com.tw
Valid from
2024-07-31T05:19:11+00:00
Expires
2028-09-08T05:19:11+00:00
Days remaining
672
Serial (hex)
03F438C330FDF1A464E7C265001B8BBCC31DFFB8
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:mail.example.com.tw, DNS:*.example.com.tw, DNS:*.example.com, IP Address:10.0.0.129, IP Address:10.0.0.130

SHA-256 fingerprint

93:D0:F7:9F:47:77:BA:8C:D4:F5:79:52:91:CD:DE:B1:CC:13:42:2E:F8:C3:A2:25:8E:47:6E:9D:B4:20:8E:DA
Certificate extensions & PEM
basicConstraints
CA:FALSE
keyUsage
Digital Signature, Key Encipherment, Data Encipherment
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
subjectAltName
DNS:mail.example.com.tw, DNS:*.example.com.tw, DNS:*.example.com, IP Address:10.0.0.129, IP Address:10.0.0.130
subjectKeyIdentifier
4E:D7:63:20:C4:05:0C:90:74:75:43:30:43:72:C7:ED:9F:EC:23:7E
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-11-05T11:09:25+00:00

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

View certificate JSON

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