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

mail.cat.net.th · 61.19.245.242:443

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=TH ST=Bangrak L=Bangrak O=National Telecom PLC. OU=online service CN=mail.cat.net.th emailAddress=support@idc.cattelecom.com
Issuer
C=TH ST=Bangrak L=Bangrak O=National Telecom PLC. OU=online service CN=mail.cat.net.th emailAddress=support@idc.cattelecom.com
Valid from
2021-09-01T11:30:09+00:00
Expires
2041-08-27T11:30:09+00:00
Days remaining
5445
Serial (hex)
3097B220
Signature
RSA-SHA1
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

A3:D1:30:21:47:E6:9A:3C:57:66:6D:B2:0C:40:F9:ED:01:CC:1B:44:D5:D0:FB:4B:01:7A:BB:0E:93:88:0E:D0
Certificate extensions & PEM
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-09-29T15:19:27+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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