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
2026-10-02T00:00:00+00:00
Expires
2027-04-18T23:59:59+00:00
Days remaining
161
Serial (hex)
037B5AE91665CD76A7E8C96F1AE9035B
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

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

SHA-256 fingerprint

10:41:B7:07:96:3D:56:05:4C:E3:CA:13:54:2A:13:0E:0E:DE:BB:49:FF:08:B4:46:AC:06:0D:71:A1:6E:B4:ED
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
6F:9D:83:97:0D:F8:53:1F:CA:0B:EE:F8:7E:39:1B:83:EC:0B:DD:DC
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, TLS Web Client 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 : 4C:63:DC:98:E5:9C:1D:AB:88:F6:1E:8A:3D:DE:AE:8F: AB:44:A3:37:7B:5F:9B:94:C3:FB:A1:9C:FC:C1:BE:26 Timestamp : Oct 2 23:03:51.620 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:A7:2E:15:A7:9E:EB:AB:98:3C:18:2D: 25:4E:29:E6:7A:52:44:AD:B4:15:71:63:F6:92:04:FF: E1:93:D4:7C:31:02:20:3C:31:44:3C:CF:5E:9F:61:6A: A5:B8:25:DA:A4:93:3B:16:C6:9F:91:57:CF:E4:1A:18: 05:67:D0:E1:23:97:5B Signed Certificate Timestamp: Version : v1 (0x0) Log ID : D6:D5:8D:A9:D0:17:53:F3:6A:4A:A0:C7:57:49:02:AF: EB:C7:DC:2C:D3:8C:D9:F7:64:C8:0C:89:19:1E:9F:02 Timestamp : Oct 2 23:03:51.619 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:24:6F:5D:CD:30:DA:62:AE:BD:76:B8:F2: 3A:33:8D:46:72:EC:E9:97:FF:85:C8:92:FF:74:4B:75: E2:8F:AA:B4:02:20:01:3A:E0:E6:60:CB:05:CE:EE:EC: E4:44:F7:3F:31:FC:97:1B:3C:1E:BD:C1:94:C9:9C:4F: F8:A6:FE:75:42:2F Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 1C:9F:68:2C:E9:FA:F0:45:69:50:F8:1B:96:8A:87:DD: DB:32:10:D8:4C:E6:C8:B2:E3:82:52:4A:C4:CF:59:9F Timestamp : Oct 2 23:03:51.798 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:DE:F4:00:E2:8C:17:73:15:DC:A4:27: 7B:3D:AF:37:3C:3A:20:4D:EB:0F:EA:63:50:2F:09:03: 5B:10:F4:F7:7A:02:20:50:EB:B8:6A:23:07:09:D7:11: F2:D1:0F:2A:1E:DE:05:F0:DB:AB:E1:92:2F:E0:0E:06: 8C:72:7A:99:1F:75:95
-----BEGIN CERTIFICATE-----
MIIGejCCBWKgAwIBAgIQA3ta6RZlzXan6MlvGukDWzANBgkqhkiG9w0BAQsFADBg
MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
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B/u7X1S6pxWaX5erehgSHL1N5ZqvrGc3yfMYIF6D
-----END CERTIFICATE-----

Cipher: ECDHE-RSA-AES256-GCM-SHA384 · Checked 2026-11-08T02:37:13+00:00

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

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