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

mx0b-00143702.pphosted.com · 148.163.141.77:443

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=US ST=Pennsylvania O=Comcast Corporation CN=securemail.comcast.com
Issuer
C=GB O=Sectigo Limited CN=Sectigo Public Server Authentication CA OV R36
Valid from
2026-01-12T00:00:00+00:00
Expires
2027-01-12T23:59:59+00:00
Days remaining
69
Serial (hex)
BFE6071BFF971867C5B222EB8E4BB24C
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:securemail.comcast.com

SHA-256 fingerprint

19:70:C8:6C:72:41:99:BB:ED:53:E7:CB:2F:FF:57:AC:B5:D8:50:F5:C3:CD:FF:86:12:F9:0A:3F:79:48:0B:C2
Certificate extensions & PEM
authorityKeyIdentifier
E3:66:74:BB:70:68:8D:2C:5D:4E:0E:A6:4A:8F:9B:37:22:9C:82:92
subjectKeyIdentifier
61:A5:35:66:84:61:56:47:ED:E8:F9:C9:64:3C:AF:A1:D7:DD:C9:AE
keyUsage
Digital Signature, Key Encipherment
basicConstraints
CA:FALSE
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
certificatePolicies
Policy: 1.3.6.1.4.1.6449.1.2.1.3.4 CPS: https://sectigo.com/CPS Policy: 2.23.140.1.2.2
crlDistributionPoints
Full Name: URI:http://crl.sectigo.com/SectigoPublicServerAuthenticationCAOVR36.crl
authorityInfoAccess
CA Issuers - URI:http://crt.sectigo.com/SectigoPublicServerAuthenticationCAOVR36.crt OCSP - URI:http://ocsp.sectigo.com
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 60:4C:9A:AF:7A:7F:77:5F:01:D4:06:FC:92:0D:C8:99: EB:0B:1C:7D:F8:C9:52:1B:FA:FA:17:77:3B:97:8B:C9 Timestamp : Jan 12 07:45:30.837 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:D4:8F:0A:4C:5B:84:C3:E2:10:69:2D: 2D:E1:95:02:75:F3:4E:63:C7:38:51:D2:9F:02:C6:75: 88:7A:27:BC:2C:02:20:6A:D0:70:54:D1:0A:08:5A:56: D2:7E:B5:17:AB:27:99:AE:E9:70:48:74:99:C3:27:ED: 9B:69:54:D7:9B:CE:D0 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 8E:CA:47:0B:AC:DE:6A:F3:A2:06:B0:A4:7A:84:B7:46: FE:1F:C6:BF:95:3E:25:E6:9B:4E:E4:02:48:F3:C6:E8 Timestamp : Jan 12 07:45:31.186 2026 GMT Extensions: 00:00:05:00:01:53:34:E9 Signature : ecdsa-with-SHA256 30:45:02:21:00:93:A6:54:06:BD:E2:2E:02:D2:94:30: A7:FA:FF:59:D3:B3:38:99:DF:E0:4F:1F:28:55:79:9B: 1E:14:EC:40:78:02:20:76:C0:A1:6E:FB:3E:85:6A:46: 30:26:D3:68:D9:6C:64:97:71:A0:B1:DE:88:6D:1D:F7: 08:2F:6D:8B:61:35:EF Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 59:6E:6C:33:86:94:B2:59:72:A2:56:C8:A0:E8:DD:90: 4A:76:E8:08:3D:DA:87:3B:01:08:38:28:14:3C:EE:59 Timestamp : Jan 12 07:45:30.849 2026 GMT Extensions: 00:00:05:00:00:0C:2C:9D Signature : ecdsa-with-SHA256 30:45:02:21:00:E0:FC:9D:E9:BC:7E:F5:FC:14:9A:F6: CB:A2:35:5F:19:8D:F9:45:2F:AF:9C:C2:0D:C7:80:99: D7:E5:A3:18:55:02:20:33:E0:57:D5:2E:BC:08:64:9F: 71:50:A7:03:58:DA:E6:EA:E0:83:13:DD:48:B2:F8:8B: A1:A9:78:19:77:1E:7E
subjectAltName
DNS:securemail.comcast.com
-----BEGIN CERTIFICATE-----
MIIHLzCCBZegAwIBAgIRAL/mBxv/lxhnxbIi645LskwwDQYJKoZIhvcNAQELBQAw
YDELMAkGA1UEBhMCR0IxGDAWBgNVBAoTD1NlY3RpZ28gTGltaXRlZDE3MDUGA1UE
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6u0V2tF+yoovHz1KbqL4mzrsI9wIw3Fnd80MBL2VtZUkrrLPOgrY5pVN8wzhM3jJ
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/aGBQ7bQYVRS8rDSQkdUoQYo6A==
-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-11-04T17:44:13+00:00

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

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