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.railcom.mn · 202.72.241.31:443

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
OU=Zimbra Collaboration Server CN=mail.railcom.mn
Issuer
O=CA OU=Zimbra Collaboration Server CN=mail.railcom.mn
Valid from
2026-09-12T00:52:47+00:00
Expires
2027-09-12T00:52:47+00:00
Days remaining
338
Serial (hex)
1789174365
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:mail.railcom.mn

SHA-256 fingerprint

3E:09:5B:CC:D0:22:90:0D:E4:1F:93:20:76:6A:B3:87:CA:76:07:EE:49:E8:B2:CF:00:B0:97:F1:E9:B6:28:99
Certificate extensions & PEM
basicConstraints
CA:FALSE
keyUsage
Digital Signature, Non Repudiation, Key Encipherment
subjectAltName
DNS:mail.railcom.mn
subjectKeyIdentifier
CD:20:9E:29:1C:5E:98:63:63:96:3D:34:D7:5C:FC:07:DF:CC:C1:FC
authorityKeyIdentifier
F3:0C:CD:56:49:6D:26:8D:8C:57:73:A0:F7:83:D4:32:46:6B:30:90
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: ECDHE-RSA-AES128-GCM-SHA256 · Checked 2026-10-08T13:56:10+00:00

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

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