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

suddenlink.com · 167.206.12.60:443

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=New York O=Altice USA CN=www.suddenlink.com
Issuer
C=GB O=Sectigo Limited CN=Sectigo Public Server Authentication CA OV R36
Valid from
2026-02-06T00:00:00+00:00
Expires
2027-02-06T23:59:59+00:00
Days remaining
139
Serial (hex)
ECE8E4861606B9C489B43FDF83BCF62F
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:www.suddenlink.com, DNS:suddenlink.com

SHA-256 fingerprint

D5:C1:20:57:11:A0:52:85:94:E5:3A:44:9E:44:4F:F5:6C:9E:9E:1C:93:FC:48:BB:80:3C:ED:A6:74:44:43:8E
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
41:49:A2:38:67:FB:71:20:EB:FB:CF:E5:5B:CD:DF:F6:DD:88:94:8B
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 : 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 : Feb 6 19:55:03.667 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:5D:AF:7E:0E:04:07:2E:02:3B:3A:EC:5A: 3A:7C:06:1F:BD:02:9E:67:99:10:B4:E8:3E:4D:E7:A5: 2C:D4:65:AD:02:20:50:13:4D:39:89:89:D8:5D:E7:A6: 36:5A:93:E4:83:E9:CA:03:8A:99:4F:85:7C:FA:BA:95: 0A:56:1C:7C:3D:C1 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 : Feb 6 19:55:04.185 2026 GMT Extensions: 00:00:05:00:02:6A:7A:62 Signature : ecdsa-with-SHA256 30:45:02:20:0C:BC:44:24:5D:DC:24:0A:57:AB:0A:4F: DA:70:1E:1F:F4:F2:22:02:BF:DD:6E:17:A3:86:74:21: 18:35:1B:D2:02:21:00:CE:4B:74:C5:6E:AB:6A:40:FB: F3:25:74:64:91:1C:60:97:A9:FB:F2:AF:E5:68:FB:5D: 5A:36:83:36:E6:17:8C 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 : Feb 6 19:55:03.834 2026 GMT Extensions: 00:00:05:00:00:22:F5:26 Signature : ecdsa-with-SHA256 30:44:02:20:5F:4E:BA:1D:42:62:7F:A7:AC:3C:BC:BF: C8:21:83:E4:90:68:D5:9C:55:CC:29:BB:B9:05:D2:7D: 05:C5:08:EC:02:20:3B:55:54:61:3B:3C:B0:5B:C1:77: 92:3F:2D:18:29:4E:AF:69:9C:77:CF:87:03:66:8E:90: 1E:5A:17:61:5E:F3
subjectAltName
DNS:www.suddenlink.com, DNS:suddenlink.com
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: ECDHE-RSA-AES128-GCM-SHA256 · Checked 2026-09-20T04:10:16+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=GB ST=Greater Manchester L=Salford O=Sectigo Limited CN=Sectigo RSA Organization Validation Secure Server CA
Issuer
C=US ST=New Jersey L=Jersey City O=The USERTRUST Network CN=USERTrust RSA Certification Authority
Valid from
2018-11-02T00:00:00+00:00
Expires
2030-12-31T23:59:59+00:00
Days remaining
1563
Serial (hex)
137D539CAA7C31A9A433701968847A8D
Signature
RSA-SHA384
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

72:A3:4A:C2:B4:24:AE:D3:F6:B0:B0:47:55:B8:8C:C0:27:DC:CC:80:6F:DD:B2:2B:4C:D7:C4:77:73:97:3E:C0
Certificate extensions & PEM
authorityKeyIdentifier
53:79:BF:5A:AA:2B:4A:CF:54:80:E1:D8:9B:C0:9D:F2:B2:03:66:CB
subjectKeyIdentifier
17:D9:D6:25:27:67:F9:31:C2:49:43:D9:30:36:44:8C:6C:A9:4F:EB
keyUsage
Digital Signature, Certificate Sign, CRL Sign
basicConstraints
CA:TRUE, pathlen:0
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
certificatePolicies
Policy: X509v3 Any Policy Policy: 2.23.140.1.2.2
crlDistributionPoints
Full Name: URI:http://crl.usertrust.com/USERTrustRSACertificationAuthority.crl
authorityInfoAccess
CA Issuers - URI:http://crt.usertrust.com/USERTrustRSAAddTrustCA.crt OCSP - URI:http://ocsp.usertrust.com
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Chain certificate 2

Subject
C=US ST=New Jersey L=Jersey City O=The USERTRUST Network CN=USERTrust RSA Certification Authority
Issuer
C=GB ST=Greater Manchester L=Salford O=Comodo CA Limited CN=AAA Certificate Services
Valid from
2019-03-12T00:00:00+00:00
Expires
2028-12-31T23:59:59+00:00
Days remaining
833
Serial (hex)
3972443AF922B751D7D36C10DD313595
Signature
RSA-SHA384
Public key
RSA 4096

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

68:B9:C7:61:21:9A:5B:1F:01:31:78:44:74:66:5D:B6:1B:BD:B1:09:E0:0F:05:CA:9F:74:24:4E:E5:F5:F5:2B
Certificate extensions & PEM
authorityKeyIdentifier
A0:11:0A:23:3E:96:F1:07:EC:E2:AF:29:EF:82:A5:7F:D0:30:A4:B4
subjectKeyIdentifier
53:79:BF:5A:AA:2B:4A:CF:54:80:E1:D8:9B:C0:9D:F2:B2:03:66:CB
keyUsage
Digital Signature, Certificate Sign, CRL Sign
basicConstraints
CA:TRUE
certificatePolicies
Policy: X509v3 Any Policy
crlDistributionPoints
Full Name: URI:http://crl.comodoca.com/AAACertificateServices.crl
authorityInfoAccess
OCSP - URI:http://ocsp.comodoca.com
-----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

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