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

www.com · 172.104.203.186:443

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
CN=www.com
Issuer
C=US O=Let's Encrypt CN=YR2
Valid from
2026-09-14T22:53:14+00:00
Expires
2026-12-13T22:53:13+00:00
Days remaining
82
Serial (hex)
06C80520B3348128857C08E5931E4211ADDA
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:*.www.com, DNS:www.com

SHA-256 fingerprint

39:3A:A2:EF:C3:29:FB:01:57:E2:D1:46:83:B2:21:7D:23:05:8C:1A:8D:90:0D:F5:75:9A:62:DF:58:B3:45:F0
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
95:1F:C9:85:6F:6D:8D:82:9F:2B:F8:57:8A:B9:F3:3C:48:77:44:C4
authorityKeyIdentifier
40:15:2D:26:79:ED:32:20:9E:DF:9A:72:1D:D6:32:1F:81:0C:81:0C
authorityInfoAccess
CA Issuers - URI:http://yr2.i.lencr.org/
subjectAltName
DNS:*.www.com, DNS:www.com
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr2.c.lencr.org/91.crl
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 26:E3:64:6E:58:69:21:23:BC:34:3F:47:24:35:9B:37: 92:CD:24:5A:88:D8:15:D3:93:33:FD:99:18:AB:47:23 Timestamp : Sep 14 23:51:42.955 2026 GMT Extensions: 00:00:05:00:41:F4:F5:9E Signature : ecdsa-with-SHA256 30:44:02:20:23:01:D7:C5:B2:4C:32:28:D8:B5:F8:ED: 9D:3D:99:A2:28:8F:29:BC:07:E3:ED:5C:C4:7B:DC:4B: A9:78:00:84:02:20:2C:97:3F:90:FA:7C:1D:74:BE:A6: 68:CF:E2:4E:29:CF:07:7B:30:DB:E2:1C:9F:A5:FE:37: 4E:4B:E6:64:29:6D 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 : Sep 14 23:51:45.195 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:03:3F:FF:03:6B:AE:37:54:C6:B6:F2:78: BD:B2:6B:38:A4:58:6D:25:B3:31:AC:C4:2F:3F:7D:02: 17:1C:46:9E:02:21:00:E2:D3:48:5B:5B:28:F1:95:C9: FC:D1:A8:EF:80:17:BA:4F:0F:2C:FE:79:E5:CF:BB:C8: D5:39:90:95:67:E8:9D
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-09-22T02:32:01+00:00

Server-presented chain · 1 additional certificate

Chain certificate 1

Subject
C=US O=Let's Encrypt CN=YR2
Issuer
C=US O=ISRG CN=Root YR
Valid from
2025-09-03T00:00:00+00:00
Expires
2028-09-02T23:59:59+00:00
Days remaining
711
Serial (hex)
4EBD24947E24D394802D84A52FD5B319
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

23:8B:85:A0:09:9C:65:B9:70:47:7D:57:24:F1:A1:D4:75:CE:50:58:CF:FE:4E:FA:87:33:89:9B:DB:86:3C:47
Certificate extensions & PEM
keyUsage
Digital Signature, Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:TRUE, pathlen:0
subjectKeyIdentifier
40:15:2D:26:79:ED:32:20:9E:DF:9A:72:1D:D6:32:1F:81:0C:81:0C
authorityKeyIdentifier
DE:E7:5B:60:D0:22:6D:40:28:7D:3F:0D:01:FE:A4:B5:52:B4:51:94
authorityInfoAccess
CA Issuers - URI:http://yr.i.lencr.org/
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr.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

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