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

mail.linulex.com · 185.95.44.5:443

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=www.linulex.com
Issuer
C=US O=Let's Encrypt CN=R13
Valid from
2026-02-17T09:09:56+00:00
Expires
2026-05-18T09:09:55+00:00
Days remaining
-138
Serial (hex)
05A91F3BC97092F68BBC0600DD163118AC3C
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:www.linulex.com

SHA-256 fingerprint

94:93:74:00:59:FA:25:2E:FC:AB:EF:11:EC:89:F1:2A:2F:74:CC:EC:FD:4C:A2:3F:24:5F:C4:EF:D4:38:35:18
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
BA:ED:C7:51:86:A6:3D:73:45:BC:C9:F0:90:E8:BB:36:8E:9A:38:C7
authorityKeyIdentifier
E7:AB:9F:0F:2C:33:A0:53:D3:5E:4F:78:C8:B2:84:0E:3B:D6:92:33
authorityInfoAccess
CA Issuers - URI:http://r13.i.lencr.org/
subjectAltName
DNS:www.linulex.com
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://r13.c.lencr.org/61.crl
ct_precert_scts
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 : Feb 17 10:08:26.838 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:D9:89:AA:08:1E:47:AE:E6:6D:9F:F4: 9D:68:85:21:39:1E:07:8E:51:26:9D:C3:86:9B:77:E6: 04:63:6E:85:5E:02:20:5F:8B:B5:03:70:56:64:50:AB: 52:A9:EB:28:51:80:B0:AC:BC:28:9D:EB:5F:28:FB:54: E0:A5:2C:5A:6B:45:FE Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 1A:8B:9D:69:4A:57:98:C8:99:A0:CA:88:BD:F4:8F:C0: B4:56:60:CC:C3:60:0D:1F:71:F4:69:FF:C7:D1:AC:A3 Timestamp : Feb 17 10:08:27.742 2026 GMT Extensions: 00:00:05:00:49:7A:8E:98 Signature : ecdsa-with-SHA256 30:46:02:21:00:B1:7D:A5:F1:D5:FB:2C:24:D8:E4:D8: 91:4C:28:58:41:A5:F2:4A:FE:FF:1B:01:AC:AD:6F:DC: 17:27:43:2D:C6:02:21:00:87:E1:14:91:1D:59:52:AE: D2:C2:18:2F:8C:17:4C:96:2D:A4:E3:5E:87:13:F4:C4: A7:A1:F1:DB:FC:78:B4:5B
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-10-02T12:06:01+00:00

Server-presented chain · 1 additional certificate

Chain certificate 1

Subject
C=US O=Let's Encrypt CN=R13
Issuer
C=US O=Internet Security Research Group CN=ISRG Root X1
Valid from
2024-03-13T00:00:00+00:00
Expires
2027-03-12T23:59:59+00:00
Days remaining
161
Serial (hex)
5A00F212D8D4B480F3924157EA298305
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

D3:B1:28:21:6A:84:3F:8E:F1:32:15:01:F5:DF:52:A5:DF:52:93:9E:E2:C1:92:97:71:2C:D3:DE:4D:41:93:54
Certificate extensions & PEM
keyUsage
Digital Signature, Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Client Authentication, TLS Web Server Authentication
basicConstraints
CA:TRUE, pathlen:0
subjectKeyIdentifier
E7:AB:9F:0F:2C:33:A0:53:D3:5E:4F:78:C8:B2:84:0E:3B:D6:92:33
authorityKeyIdentifier
79:B4:59:E6:7B:B6:E5:E4:01:73:80:08:88:C8:1A:58:F6:E9:9B:6E
authorityInfoAccess
CA Issuers - URI:http://x1.i.lencr.org/
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://x1.c.lencr.org/ 
-----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 →