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

telmex.com · 66.225.237.224:443

Verified

Certificate chain, hostname and dates verified using this server’s CA store.

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
41
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-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-09-23T02:03:38+00:00

Server-presented chain · 1 additional certificate

Chain certificate 1

Subject
C=US O=DigiCert Inc OU=www.digicert.com CN=GeoTrust TLS RSA CA G1
Issuer
C=US O=DigiCert Inc OU=www.digicert.com CN=DigiCert Global Root G2
Valid from
2017-11-02T12:23:37+00:00
Expires
2027-11-02T12:23:37+00:00
Days remaining
405
Serial (hex)
0D07782A133FC6F9A57296E131FFD179
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

C0:6E:30:7F:7C:FC:1D:32:FA:72:A4:C0:33:C8:7B:90:01:9A:F2:16:F0:77:5D:64:97:8A:2E:CA:6C:8A:23:0E
Certificate extensions & PEM
subjectKeyIdentifier
94:4F:D4:5D:8B:E4:A4:E2:A6:80:FE:FD:D8:F9:00:EF:A3:BE:02:57
authorityKeyIdentifier
4E:22:54:20:18:95:E6:E3:6E:E6:0F:FA:FA:B9:12:ED:06:17:8F:39
keyUsage
Digital Signature, Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
basicConstraints
CA:TRUE, pathlen:0
authorityInfoAccess
OCSP - URI:http://ocsp.digicert.com
crlDistributionPoints
Full Name: URI:http://crl3.digicert.com/DigiCertGlobalRootG2.crl
certificatePolicies
Policy: X509v3 Any Policy CPS: https://www.digicert.com/CPS
-----BEGIN CERTIFICATE-----
MIIEjTCCA3WgAwIBAgIQDQd4KhM/xvmlcpbhMf/ReTANBgkqhkiG9w0BAQsFADBh
MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3
d3cuZGlnaWNlcnQuY29tMSAwHgYDVQQDExdEaWdpQ2VydCBHbG9iYWwgUm9vdCBH
MjAeFw0xNzExMDIxMjIzMzdaFw0yNzExMDIxMjIzMzdaMGAxCzAJBgNVBAYTAlVT
MRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5j
b20xHzAdBgNVBAMTFkdlb1RydXN0IFRMUyBSU0EgQ0EgRzEwggEiMA0GCSqGSIb3
DQEBAQUAA4IBDwAwggEKAoIBAQC+F+jsvikKy/65LWEx/TMkCDIuWegh1Ngwvm4Q
yISgP7oU5d79eoySG3vOhC3w/3jEMuipoH1fBtp7m0tTpsYbAhch4XA7rfuD6whU
gajeErLVxoiWMPkC/DnUvbgi74BJmdBiuGHQSd7LwsuXpTEGG9fYXcbTVN5SATYq
DfbexbYxTMwVJWoVb6lrBEgM3gBBqiiAiy800xu1Nq07JdCIQkBsNpFtZbIZhsDS
fzlGWP4wEmBQ3O67c+ZXkFr2DcrXBEtHam80Gp2SNhou2U5U7UesDL/xgLK6/0d7
6TnEVMSUVJkZ8VeZr+IUIlvoLrtjLbqugb0T3OYXW+CQU0kBAgMBAAGjggFAMIIB
PDAdBgNVHQ4EFgQUlE/UXYvkpOKmgP792PkA76O+AlcwHwYDVR0jBBgwFoAUTiJU
IBiV5uNu5g/6+rkS7QYXjzkwDgYDVR0PAQH/BAQDAgGGMB0GA1UdJQQWMBQGCCsG
AQUFBwMBBggrBgEFBQcDAjASBgNVHRMBAf8ECDAGAQH/AgEAMDQGCCsGAQUFBwEB
BCgwJjAkBggrBgEFBQcwAYYYaHR0cDovL29jc3AuZGlnaWNlcnQuY29tMEIGA1Ud
HwQ7MDkwN6A1oDOGMWh0dHA6Ly9jcmwzLmRpZ2ljZXJ0LmNvbS9EaWdpQ2VydEds
b2JhbFJvb3RHMi5jcmwwPQYDVR0gBDYwNDAyBgRVHSAAMCowKAYIKwYBBQUHAgEW
HGh0dHBzOi8vd3d3LmRpZ2ljZXJ0LmNvbS9DUFMwDQYJKoZIhvcNAQELBQADggEB
AIIcBDqC6cWpyGUSXAjjAcYwsK4iiGF7KweG97i1RJz1kwZhRoo6orU1JtBYnjzB
c4+/sXmnHJk3mlPyL1xuIAt9sMeC7+vreRIF5wFBC0MCN5sbHwhNN1JzKbifNeP5
ozpZdQFmkCo+neBiKR6HqIA+LMTMCMMuv2khGGuPHmtDze4GmEGZtYLyF8EQpa5Y
jPuV6k2Cr/N3XxFpT3hRpt/3usU/Zb9wfKPtWpoznZ4/44c1p9rzFcZYrWkj3A+7
TNBJE0GmP2fhXhP1D/XVfIW/h0yCJGEiV9Glm/uGOa3DXHlmbAcxSyCRraG+ZBkA
7h4SeM6Y8l/7MBRpPCz6l8Y=
-----END CERTIFICATE-----

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

View certificate JSON

Registration / WHOIS →DNS records →