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

reduno.com.mx · 200.57.176.145:443

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=MX L=Ciudad de Mexico O=Teléfonos de México, S.A.B. de C.V CN=*.telmex.com
Issuer
C=US O=DigiCert Inc OU=www.digicert.com CN=GeoTrust TLS RSA CA G1
Valid from
2025-10-03T00:00:00+00:00
Expires
2026-11-03T23:59:59+00:00
Days remaining
40
Serial (hex)
0731A6C79A469D5F259AEAF90A1A7CB7
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:*.telmex.com, DNS:telmex.com

SHA-256 fingerprint

96:C6:E7:BE:BB:6C:09:D2:A9:F8:CD:5D:21:CB:AA:41:6B:A2:15:EC:1D:C2:BC:FA:78:08:AC:5C:05:84:50:87
Certificate extensions & PEM
authorityKeyIdentifier
94:4F:D4:5D:8B:E4:A4:E2:A6:80:FE:FD:D8:F9:00:EF:A3:BE:02:57
subjectKeyIdentifier
F4:E8:97:86:AD:2D:E3:F2:0D:B3:8A:1B:2B:CF:3E:AA:D9:F1:83:51
subjectAltName
DNS:*.telmex.com, DNS:telmex.com
certificatePolicies
Policy: 2.23.140.1.2.2 CPS: http://www.digicert.com/CPS
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
crlDistributionPoints
Full Name: URI:http://cdp.geotrust.com/GeoTrustTLSRSACAG1.crl
authorityInfoAccess
OCSP - URI:http://status.geotrust.com CA Issuers - URI:http://cacerts.geotrust.com/GeoTrustTLSRSACAG1.crt
basicConstraints
CA:FALSE
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : D7:6D:7D:10:D1:A7:F5:77:C2:C7:E9:5F:D7:00:BF:F9: 82:C9:33:5A:65:E1:D0:B3:01:73:17:C0:C8:C5:69:77 Timestamp : Oct 3 15:49:03.677 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:E9:C1:5E:16:AE:8A:44:C5:39:C4:79: 50:AC:C9:82:6B:43:84:A9:FD:EC:C9:F3:58:D2:42:6E: E8:6A:22:32:71:02:21:00:E2:CA:28:1B:6B:DD:EC:E2: F6:26:51:88:50:04:67:15:A6:F1:08:D8:C4:6F:37:5B: B0:AD:96:F3:AD:3B:36:F9 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : C2:31:7E:57:45:19:A3:45:EE:7F:38:DE:B2:90:41:EB: C7:C2:21:5A:22:BF:7F:D5:B5:AD:76:9A:D9:0E:52:CD Timestamp : Oct 3 15:49:03.722 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:EC:E2:CB:5F:BC:6A:58:77:95:3C:3F: 24:54:7D:7C:A9:EF:24:49:54:F7:A4:6C:29:0C:E8:63: 65:E6:2A:0E:21:02:20:65:1A:80:82:2D:FE:2D:DB:D9: 08:10:86:31:C6:36:A6:B2:24:D7:B2:E5:DC:B3:D5:B8: 18:28:56:61:9C:D0:D5 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 94:4E:43:87:FA:EC:C1:EF:81:F3:19:24:26:A8:18:65: 01:C7:D3:5F:38:02:01:3F:72:67:7D:55:37:2E:19:D8 Timestamp : Oct 3 15:49:03.743 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:E5:A0:19:EB:58:B1:35:09:5D:D8:D8: F0:79:F4:22:79:1A:01:98:CA:9E:FA:CA:A4:6C:D4:BD: 09:CE:A6:EF:D6:02:21:00:BC:3F:7D:69:B5:1C:EC:CD: 78:07:C5:36:11:D1:C6:E1:FE:9C:4A:89:F6:AE:26:9D: CB:72:40:A5:5E:E4:18:0D
-----BEGIN CERTIFICATE-----
MIIGczCCBVugAwIBAgIQBzGmx5pGnV8lmur5Chp8tzANBgkqhkiG9w0BAQsFADBg
MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
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j3SHyFjuuhx0RBqrAWrS9EJU3l+MgSU=
-----END CERTIFICATE-----

Cipher: ECDHE-RSA-AES256-GCM-SHA384 · Checked 2026-09-24T13:58:47+00:00

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

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