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

TLS

mail.4cun.com · 202.102.86.237:443

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
CN=mail.4cun.com
Issuer
C=US O=DigiCert Inc OU=www.digicert.com CN=Encryption Everywhere DV TLS CA - G2
Valid from
2019-11-14T00:00:00+00:00
Expires
2020-11-13T12:00:00+00:00
Days remaining
-2149
Serial (hex)
04F890A1030181D0D9DF1DEE54CA1ADA
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:mail.4cun.com

SHA-256 fingerprint

E2:B2:E5:81:3D:95:A4:72:52:DE:44:7A:88:3C:BC:A8:F5:CC:88:63:C4:08:C2:5B:58:E6:13:49:E9:A2:C8:B5
Certificate extensions & PEM
authorityKeyIdentifier
78:DF:91:90:5F:EE:DE:AC:F6:C5:75:EB:D5:4C:55:53:EF:24:4A:B6
subjectKeyIdentifier
B2:80:1E:E1:AA:01:26:AE:23:0E:23:67:DD:04:9E:31:12:66:C9:18
subjectAltName
DNS:mail.4cun.com
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
certificatePolicies
Policy: 2.16.840.1.114412.1.2 CPS: https://www.digicert.com/CPS Policy: 2.23.140.1.2.1
authorityInfoAccess
OCSP - URI:http://ocsp.digicert.com CA Issuers - URI:http://cacerts.digicert.com/EncryptionEverywhereDVTLSCA-G2.crt
basicConstraints
CA:FALSE
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : A4:B9:09:90:B4:18:58:14:87:BB:13:A2:CC:67:70:0A: 3C:35:98:04:F9:1B:DF:B8:E3:77:CD:0E:C8:0D:DC:10 Timestamp : Nov 14 07:44:40.692 2019 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:FA:91:6D:B3:58:CC:08:0E:AD:CF:C3: 55:D3:85:35:89:FE:D8:39:01:64:9F:C1:E1:D8:EB:93: F3:F3:71:F6:98:02:21:00:C9:83:9B:BD:BA:AE:A4:D8: 50:8E:D8:05:2D:8E:54:E4:46:3A:7A:C1:5A:90:FC:19: 1D:BF:60:32:49:78:1C:AC Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 5E:A7:73:F9:DF:56:C0:E7:B5:36:48:7D:D0:49:E0:32: 7A:91:9A:0C:84:A1:12:12:84:18:75:96:81:71:45:58 Timestamp : Nov 14 07:44:40.570 2019 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:F8:C9:31:72:B3:EA:72:F4:60:2D:AD: E0:AA:97:FE:33:C5:85:F7:FA:8E:66:20:91:6B:C6:B9: 06:DF:F3:A8:43:02:21:00:A3:90:3E:63:14:34:EB:49: 7E:14:70:58:2E:F3:77:31:97:A2:AE:ED:09:C4:71:FD: C3:22:5A:36:AA:2E:0C:E6
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: Unavailable · Checked 2026-10-01T21:45:55+00:00

Server-presented chain · 1 additional certificate

Chain certificate 1

Subject
C=US O=DigiCert Inc OU=www.digicert.com CN=Encryption Everywhere DV TLS CA - G2
Issuer
C=US O=DigiCert Inc OU=www.digicert.com CN=DigiCert Global Root G2
Valid from
2017-11-27T12:46:40+00:00
Expires
2027-11-27T12:46:40+00:00
Days remaining
421
Serial (hex)
0DE0FFB5EE62CB61109F608C9CED5ED3
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

B1:AC:8C:FB:18:1B:9C:93:54:E1:77:5F:CB:DF:CF:E7:89:8C:5C:C9:A1:7D:76:31:5B:57:C1:12:EE:E5:52:34
Certificate extensions & PEM
subjectKeyIdentifier
78:DF:91:90:5F:EE:DE:AC:F6:C5:75:EB:D5:4C:55:53:EF:24:4A:B6
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: 2.16.840.1.114412.1.2 CPS: https://www.digicert.com/CPS Policy: 2.23.140.1.2.1
-----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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