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

TLSv1.2

mail.sinet.ir · 87.107.91.162:443

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
CN=Mail1
Issuer
CN=Mail1
Valid from
2026-05-21T10:42:26+00:00
Expires
2031-05-21T10:42:26+00:00
Days remaining
1688
Serial (hex)
3D776EF8CFB9349C4E49AA28D7142795
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:Mail1, DNS:Mail1.sinet.local

SHA-256 fingerprint

2B:9F:BB:A4:1D:E2:C4:AE:77:6F:22:18:F2:60:6A:D5:53:70:F1:0F:2D:E0:B0:AC:DC:18:9D:2A:36:C9:69:26
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
subjectAltName
DNS:Mail1, DNS:Mail1.sinet.local
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: ECDHE-RSA-AES256-GCM-SHA384 · Checked 2026-10-05T17:21:54+00:00

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

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