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

mx0a-007e5801.pphosted.com · 205.220.166.108:443

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
The certificate has expired.

Certificate verification failed

Subject
C=US ST=Louisiana L=Monroe O=Lumen Technologies, Inc. CN=securemail.lumen.com
Issuer
C=US O=DigiCert Inc CN=DigiCert Global G2 TLS RSA SHA256 2020 CA1
Valid from
2025-06-25T00:00:00+00:00
Expires
2026-06-24T23:59:59+00:00
Days remaining
-92
Serial (hex)
0D8B79304FCA64B07A37E2DA07D4F6F1
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:securemail.lumen.com, DNS:Securemail.quantumfiber.com, DNS:Secureemail.centurylink.com

SHA-256 fingerprint

2B:C5:35:93:7C:FB:E8:FB:2F:69:61:C9:EB:81:E8:0F:1E:ED:20:59:99:2D:3C:B6:DA:42:8C:D9:D6:E1:25:02
Certificate extensions & PEM
authorityKeyIdentifier
74:85:80:C0:66:C7:DF:37:DE:CF:BD:29:37:AA:03:1D:BE:ED:CD:17
subjectKeyIdentifier
EB:75:C2:33:D8:98:9B:A2:CF:EC:F0:B6:27:73:04:2F:A9:E7:8D:8B
subjectAltName
DNS:securemail.lumen.com, DNS:Securemail.quantumfiber.com, DNS:Secureemail.centurylink.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://crl3.digicert.com/DigiCertGlobalG2TLSRSASHA2562020CA1-1.crl Full Name: URI:http://crl4.digicert.com/DigiCertGlobalG2TLSRSASHA2562020CA1-1.crl
authorityInfoAccess
OCSP - URI:http://ocsp.digicert.com CA Issuers - URI:http://cacerts.digicert.com/DigiCertGlobalG2TLSRSASHA2562020CA1-1.crt
basicConstraints
CA:FALSE
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 96:97:64:BF:55:58:97:AD:F7:43:87:68:37:08:42:77: E9:F0:3A:D5:F6:A4:F3:36:6E:46:A4:3F:0F:CA:A9:C6 Timestamp : Jun 25 16:58:28.887 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:60:5F:2B:DD:4F:9E:3A:33:93:0D:50:BC: 66:61:20:74:E1:48:4E:A9:C7:CC:8C:4D:69:A9:A7:E0: 5B:3E:E1:86:02:21:00:89:C9:20:57:86:03:6F:2A:1A: 4E:B4:25:A3:F4:0E:45:CA:D2:27:CD:34:0E:80:3D:2E: D9:F5:AF:07:15:8C:1B Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 64:11:C4:6C:A4:12:EC:A7:89:1C:A2:02:2E:00:BC:AB: 4F:28:07:D4:1E:35:27:AB:EA:FE:D5:03:C9:7D:CD:F0 Timestamp : Jun 25 16:58:28.887 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:4D:5A:7B:86:07:7B:3E:E6:BC:48:B6:38: 50:FE:58:32:C2:49:59:3F:9B:3A:18:EF:B5:7A:1F:26: BF:D9:7C:B4:02:21:00:DA:54:6B:5A:E7:1A:B9:C4:9B: ED:AB:8F:9B:CB:31:4A:6A:D4:E3:E4:7F:0E:B6:C3:92: EF:1F:40:6B:73:D5:1A Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 49:9C:9B:69:DE:1D:7C:EC:FC:36:DE:CD:87:64:A6:B8: 5B:AF:0A:87:80:19:D1:55:52:FB:E9:EB:29:DD:F8:C3 Timestamp : Jun 25 16:58:28.907 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:6F:18:C1:9D:DF:16:9A:15:1B:AF:D0:24: 1E:EA:B0:6D:82:49:6F:6E:FD:BE:76:B4:EB:A2:B2:55: 3B:58:D0:0E:02:21:00:E3:C3:A8:32:AA:C9:01:8E:C2: 44:8F:EF:A9:81:28:41:06:60:95:96:88:35:CB:73:18: D3:E1:FC:75:89:2A:13
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-09-24T13:55:19+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=US O=DigiCert Inc CN=DigiCert Global G2 TLS RSA SHA256 2020 CA1
Issuer
C=US O=DigiCert Inc OU=www.digicert.com CN=DigiCert Global Root G2
Valid from
2021-03-30T00:00:00+00:00
Expires
2031-03-29T23:59:59+00:00
Days remaining
1647
Serial (hex)
0CF5BD062B5602F47AB8502C23CCF066
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

C8:02:5F:9F:C6:5F:DF:C9:5B:3C:A8:CC:78:67:B9:A5:87:B5:27:79:73:95:79:17:46:3F:C8:13:D0:B6:25:A9
Certificate extensions & PEM
basicConstraints
CA:TRUE, pathlen:0
subjectKeyIdentifier
74:85:80:C0:66:C7:DF:37:DE:CF:BD:29:37:AA:03:1D:BE:ED:CD:17
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
authorityInfoAccess
OCSP - URI:http://ocsp.digicert.com CA Issuers - URI:http://cacerts.digicert.com/DigiCertGlobalRootG2.crt
crlDistributionPoints
Full Name: URI:http://crl3.digicert.com/DigiCertGlobalRootG2.crl
certificatePolicies
Policy: 2.16.840.1.114412.2.1 Policy: 2.23.140.1.1 Policy: 2.23.140.1.2.1 Policy: 2.23.140.1.2.2 Policy: 2.23.140.1.2.3
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Chain certificate 2

Subject
C=US O=DigiCert Inc OU=www.digicert.com CN=DigiCert Global Root G2
Issuer
C=US O=DigiCert Inc OU=www.digicert.com CN=DigiCert Global Root G2
Valid from
2013-08-01T12:00:00+00:00
Expires
2038-01-15T12:00:00+00:00
Days remaining
4130
Serial (hex)
033AF1E6A711A9A0BB2864B11D09FAE5
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

CB:3C:CB:B7:60:31:E5:E0:13:8F:8D:D3:9A:23:F9:DE:47:FF:C3:5E:43:C1:14:4C:EA:27:D4:6A:5A:B1:CB:5F
Certificate extensions & PEM
basicConstraints
CA:TRUE
keyUsage
Digital Signature, Certificate Sign, CRL Sign
subjectKeyIdentifier
4E:22:54:20:18:95:E6:E3:6E:E6:0F:FA:FA:B9:12:ED:06:17:8F:39
-----BEGIN CERTIFICATE-----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-----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 →