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

bretagnetelecom.com · 37.157.224.210:443

Unverified
Certificate verification failed. These are unverified certificate details presented by the server. Peer certificate subjectAltName did not match expected name `bretagnetelecom.com'
The certificate expires within 30 days.

Certificate verification failed

Subject
CN=*.bt-blue.com
Issuer
C=US O=DigiCert Inc OU=www.digicert.com CN=GeoTrust TLS RSA CA G1
Valid from
2025-12-08T00:00:00+00:00
Expires
2026-11-07T23:59:59+00:00
Days remaining
29
Serial (hex)
0FFD985AFF80234D1223283ED9D126C7
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:*.bt-blue.com, DNS:bt-blue.com

SHA-256 fingerprint

13:CB:C8:12:18:20:32:9E:83:76:CD:0F:53:CE:80:CD:B8:DB:11:12:93:9F:74:55:3C:A8:68:00:CF:87:6A:F8
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
F6:1E:DA:38:C4:23:5A:B5:91:BB:73:6B:65:EC:93:04:17:0C:52:96
subjectAltName
DNS:*.bt-blue.com, DNS:bt-blue.com
certificatePolicies
Policy: 2.23.140.1.2.1 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 : D8:09:55:3B:94:4F:7A:FF:C8:16:19:6F:94:4F:85:AB: B0:F8:FC:5E:87:55:26:0F:15:D1:2E:72:BB:45:4B:14 Timestamp : Dec 8 15:42:41.607 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:09:EF:34:0C:A8:E8:35:EA:08:77:C7:2A: E5:CB:72:AC:E0:F3:7A:6D:31:F2:43:BE:89:A1:E1:F9: CE:56:FA:B1:02:20:55:B3:22:F6:60:9F:DC:2F:98:FF: 6D:3D:B3:20:9A:F3:72:BA:BA:67:F8:87:A8:4D:84:FB: 61:6B:D7:4C:11:B2 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : C8:A3:C4:7F:C7:B3:AD:B9:35:6B:01:3F:6A:7A:12:6D: E3:3A:4E:43:A5:C6:46:F9:97:AD:39:75:99:1D:CF:9A Timestamp : Dec 8 15:42:41.621 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:52:5B:9F:84:7F:63:5A:D9:D2:4B:A9:78: C3:84:48:57:2B:08:60:5D:58:58:E2:FB:A2:48:EB:ED: 46:C9:52:72:02:21:00:C1:03:B5:FF:21:2D:F8:E8:B9: BE:C1:32:F1:37:C1:2E:CC:94:8D:CB:1E:72:19:7C:4F: FC:22:93:FB:E9:B5:93 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 : Dec 8 15:42:41.621 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:CC:72:08:D5:4C:B3:1B:F3:7B:64:63: 12:5B:55:1D:4E:84:7B:C6:A3:83:FA:3B:F7:37:F1:87: 2C:13:BE:4E:7B:02:21:00:E4:1D:CF:E5:7D:8F:DD:AE: 37:6C:DA:95:C7:DB:0D:3F:64:0B:31:D1:5C:24:6B:D9: 65:AE:8E:0C:F2:B5:3D:86
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-10-09T17:27:27+00:00

Server-presented chain · 2 additional certificates

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
388
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-----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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
4115
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.

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