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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

mail.mckay.com · 37.1.88.130:443

Unverified
Certificate verification failed. These are unverified certificate details presented by the server. Peer certificate CN=`webmail.mckay.com' did not match expected CN=`mail.mckay.com'

Certificate verification failed

Subject
CN=webmail.mckay.com
Issuer
C=US O=DigiCert Inc OU=www.digicert.com CN=RapidSSL TLS RSA CA G1
Valid from
2026-06-30T00:00:00+00:00
Expires
2027-01-14T23:59:59+00:00
Days remaining
113
Serial (hex)
03C5EDC294A6052D329EA04124361AD9
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:webmail.mckay.com

SHA-256 fingerprint

20:DF:BE:44:AF:BA:36:27:97:01:98:E1:79:FD:86:06:28:CA:E7:A5:EF:2D:6B:91:79:05:1A:52:7D:C8:4F:C9
Certificate extensions & PEM
authorityKeyIdentifier
0C:DB:6C:82:49:0F:4A:67:0A:B8:14:EE:7A:C4:48:52:88:EB:56:38
subjectKeyIdentifier
70:9A:83:B4:B9:4B:BC:D6:4C:52:C3:72:5E:65:BD:D4:3A:B6:B5:1D
subjectAltName
DNS:webmail.mckay.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.rapidssl.com/RapidSSLTLSRSACAG1.crl
authorityInfoAccess
OCSP - URI:http://status.rapidssl.com CA Issuers - URI:http://cacerts.rapidssl.com/RapidSSLTLSRSACAG1.crt
basicConstraints
CA:FALSE
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 4C:63:DC:98:E5:9C:1D:AB:88:F6:1E:8A:3D:DE:AE:8F: AB:44:A3:37:7B:5F:9B:94:C3:FB:A1:9C:FC:C1:BE:26 Timestamp : Jun 30 01:43:11.596 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:A8:86:76:25:3E:D6:62:B9:54:D9:F1: 5D:E5:00:AE:8F:4A:D6:2B:63:D3:4F:13:80:58:25:02: B4:B5:59:B6:BC:02:21:00:FE:9B:5F:F8:5B:82:FC:CE: 6A:D5:3A:73:46:07:0B:85:64:97:7C:78:EE:81:DC:04: 61:86:05:FE:AC:83:30:FA Signed Certificate Timestamp: Version : v1 (0x0) Log ID : D6:D5:8D:A9:D0:17:53:F3:6A:4A:A0:C7:57:49:02:AF: EB:C7:DC:2C:D3:8C:D9:F7:64:C8:0C:89:19:1E:9F:02 Timestamp : Jun 30 01:43:11.605 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:E0:42:53:BC:50:4C:C6:3C:42:EC:2C: 82:02:16:8B:F1:46:0D:77:D7:52:27:4A:AB:6F:71:36: B5:CC:F5:39:DA:02:21:00:AD:73:AD:4C:AF:84:CD:55: 5B:A1:8B:5D:7E:2B:75:E0:B8:E9:1F:9A:B6:40:78:70: 7D:4F:CD:12:EC:3F:A9:7E 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 : Jun 30 01:43:11.786 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:C6:35:77:18:E1:0D:FB:CE:FF:2A:E3: 85:43:94:C7:C1:49:E8:84:1C:A9:6D:C1:60:F1:15:0D: 9F:9D:DE:C3:C1:02:21:00:89:10:34:88:F5:C6:4E:DC: 13:0F:28:3D:A7:59:C5:59:1D:82:D5:35:1F:54:FA:9C: 9A:B1:6E:3C:67:77:DA:7B
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-09-23T13:44:37+00:00

Server-presented chain · 1 additional certificate

Chain certificate 1

Subject
C=US O=DigiCert Inc OU=www.digicert.com CN=RapidSSL TLS RSA CA G1
Issuer
C=US O=DigiCert Inc OU=www.digicert.com CN=DigiCert Global Root G2
Valid from
2017-11-02T12:24:33+00:00
Expires
2027-11-02T12:24:33+00:00
Days remaining
404
Serial (hex)
0B259422CED9812A15A04E99528A0EFA
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

44:22:E9:63:EE:53:CD:58:CC:9F:85:CD:40:BF:5F:FE:C0:09:5F:DF:1A:15:45:35:66:1C:1C:06:BC:AD:C6:9B
Certificate extensions & PEM
subjectKeyIdentifier
0C:DB:6C:82:49:0F:4A:67:0A:B8:14:EE:7A:C4:48:52:88:EB:56:38
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: 2.16.840.1.114412.1.1 CPS: https://www.digicert.com/CPS Policy: 2.16.840.1.114412.1.2 Policy: 2.23.140.1.2.1 Policy: 2.23.140.1.2.2
-----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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