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

4b42.com · 193.33.95.12:443

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=4b42.com
Issuer
C=US O=Let's Encrypt CN=E8
Valid from
2026-03-27T14:47:04+00:00
Expires
2026-06-25T14:47:03+00:00
Days remaining
-90
Serial (hex)
054A16BAC2E5625A0032A332236F8E62AD77
Signature
ecdsa-with-SHA384
Public key
EC 256 prime256v1

Subject alternative names (SAN)

DNS:*.4b42.at, DNS:*.4b42.biz, DNS:*.4b42.ch, DNS:*.4b42.com, DNS:4b42.at, DNS:4b42.biz, DNS:4b42.ch, DNS:4b42.com

SHA-256 fingerprint

65:3E:63:5A:8A:39:CE:98:94:AF:69:0E:7D:EC:8D:91:5E:35:0E:C4:5F:20:2C:3B:02:FE:18:02:6B:F2:0F:1E
Certificate extensions & PEM
keyUsage
Digital Signature
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
79:8F:6A:44:CC:74:2D:1E:C4:46:5C:5E:AB:21:29:A7:1F:1D:76:68
authorityKeyIdentifier
8F:0D:13:A2:F6:2E:7E:D1:50:6C:33:18:38:5D:59:8E:23:72:91:CA
authorityInfoAccess
CA Issuers - URI:http://e8.i.lencr.org/
subjectAltName
DNS:*.4b42.at, DNS:*.4b42.biz, DNS:*.4b42.ch, DNS:*.4b42.com, DNS:4b42.at, DNS:4b42.biz, DNS:4b42.ch, DNS:4b42.com
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://e8.c.lencr.org/120.crl
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 16:83:2D:AB:F0:A9:25:0F:0F:F0:3A:A5:45:FF:C8:BF: C8:23:D0:87:4B:F6:04:29:27:F8:E7:1F:33:13:F5:FA Timestamp : Mar 27 15:45:34.960 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:F3:54:25:29:C1:FE:FE:DE:DC:7D:F2: BB:7B:1C:39:0D:0D:60:89:DA:F2:71:51:BD:8B:71:10: 10:23:E8:A4:DF:02:20:45:55:A2:A1:2A:1D:32:F8:18: 22:46:0B:A5:34:26:16:CC:41:6C:40:D6:E0:36:8D:61: 34:FE:A3:D9:22:6D:DF Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 6C:FE:50:19:43:A8:5E:A9:16:BC:52:D1:33:E4:DC:C9: 1E:F1:41:1C:7D:25:84:20:D1:73:80:9E:18:18:EB:3A Timestamp : Mar 27 15:45:35.151 2026 GMT Extensions: 00:00:05:00:04:96:90:6B Signature : ecdsa-with-SHA256 30:45:02:21:00:F0:53:8E:9E:8C:7A:51:8A:82:1F:D4: 9B:3C:8A:2A:AF:6F:C0:02:C7:4D:C5:4E:06:6E:79:DE: 66:7F:FA:9C:8B:02:20:0A:45:FF:E6:BF:FC:C5:B4:02: 89:21:9F:B2:D5:B9:A2:F1:77:3F:BE:E0:94:A3:CF:84: E4:AA:4A:B8:9D:5E:42
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-09-23T08:11:23+00:00

Server-presented chain · 1 additional certificate

Chain certificate 1

Subject
C=US O=Let's Encrypt CN=E8
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
170
Serial (hex)
63959363C24E7082715918BFC3D7ED56
Signature
RSA-SHA256
Public key
EC 384 secp384r1

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

83:62:4F:D3:38:C8:D9:B0:23:C1:8A:67:CB:7A:9C:05:19:DA:43:D1:17:75:B4:C6:CB:DA:D4:5C:3D:99:7C:52
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
8F:0D:13:A2:F6:2E:7E:D1:50:6C:33:18:38:5D:59:8E:23:72:91:CA
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.

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