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.as400810.net · 31.56.20.252:443

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=CH L=Schaffhausen O=Plesk CN=Plesk emailAddress=info@plesk.com
Issuer
C=CH L=Schaffhausen O=Plesk CN=Plesk emailAddress=info@plesk.com
Valid from
2024-03-23T20:23:19+00:00
Expires
2025-03-23T20:23:19+00:00
Days remaining
-592
Serial (hex)
65FF3A37
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

DF:5C:CD:F4:2C:C4:17:64:4E:5F:BE:41:9F:76:5C:60:BE:7A:89:D0:64:E5:34:EE:CE:22:DC:89:F3:90:3F:8B
Certificate extensions & PEM
extendedKeyUsage
TLS Web Server Authentication
subjectKeyIdentifier
B4:71:6A:D2:85:7F:3F:3F:99:C5:66:26:64:A9:BB:38:43:C3:80:17
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-11-05T15:21:48+00:00

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

View certificate JSON

Registration / WHOIS →DNS records →