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

TLSv1.2

monoro.de · 31.15.67.9:443

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-old.berlin.freifunk.net
Issuer
C=US O=Let's Encrypt CN=R3
Valid from
2024-04-21T09:57:17+00:00
Expires
2024-07-20T09:57:16+00:00
Days remaining
-796
Serial (hex)
04E2C32D11D191A54D51E7544CB21F51F8EB
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:www-old.berlin.freifunk.net

SHA-256 fingerprint

19:ED:BD:BD:67:BE:0C:39:F5:D2:64:39:63:88:74:CA:A0:94:9C:96:FA:4A:BC:0F:42:42:9A:96:0D:3F:BC:95
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
63:5B:3B:99:57:1F:50:C4:D6:D6:D9:D1:AA:C0:6F:B7:E0:8F:7B:8C
authorityKeyIdentifier
14:2E:B3:17:B7:58:56:CB:AE:50:09:40:E6:1F:AF:9D:8B:14:C2:C6
authorityInfoAccess
OCSP - URI:http://r3.o.lencr.org CA Issuers - URI:http://r3.i.lencr.org/
subjectAltName
DNS:www-old.berlin.freifunk.net
certificatePolicies
Policy: 2.23.140.1.2.1
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 76:FF:88:3F:0A:B6:FB:95:51:C2:61:CC:F5:87:BA:34: B4:A4:CD:BB:29:DC:68:42:0A:9F:E6:67:4C:5A:3A:74 Timestamp : Apr 21 10:57:17.552 2024 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:AC:06:3B:8D:2A:31:62:D2:0A:6B:60: DE:F2:7F:46:1B:01:6D:67:EE:B1:74:92:3C:6A:75:E4: A6:C5:25:95:64:02:21:00:9B:D3:58:18:65:A0:73:C9: 3C:D8:75:B3:05:56:DE:B6:57:AE:83:18:78:AA:16:72: 31:37:6B:25:40:32:AC:75 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 48:B0:E3:6B:DA:A6:47:34:0F:E5:6A:02:FA:9D:30:EB: 1C:52:01:CB:56:DD:2C:81:D9:BB:BF:AB:39:D8:84:73 Timestamp : Apr 21 10:57:17.512 2024 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:38:3B:F0:DF:87:C0:AF:DC:10:77:C2:C2: FB:54:93:00:37:08:70:95:61:67:1B:8F:23:BD:9F:FC: 8C:DB:23:D8:02:21:00:B3:9C:1C:B4:BC:9B:FE:57:97: 61:CF:F4:55:BF:B5:7A:3B:40:97:49:3C:59:B2:CF:20: CF:0F:B6:2A:DA:33:A8
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: DHE-RSA-AES256-GCM-SHA384 · Checked 2026-09-23T14:01:18+00:00

Server-presented chain · 1 additional certificate

Chain certificate 1

Subject
C=US O=Let's Encrypt CN=R3
Issuer
C=US O=Internet Security Research Group CN=ISRG Root X1
Valid from
2020-09-04T00:00:00+00:00
Expires
2025-09-15T16:00:00+00:00
Days remaining
-373
Serial (hex)
912B084ACF0C18A753F6D62E25A75F5A
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

67:AD:D1:16:6B:02:0A:E6:1B:8F:5F:C9:68:13:C0:4C:2A:A5:89:96:07:96:86:55:72:A3:C7:E7:37:61:3D:FD
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
14:2E:B3:17:B7:58:56:CB:AE:50:09:40:E6:1F:AF:9D:8B:14:C2:C6
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/
crlDistributionPoints
Full Name: URI:http://x1.c.lencr.org/
certificatePolicies
Policy: 2.23.140.1.2.1 Policy: 1.3.6.1.4.1.44947.1.1.1
-----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.

View certificate JSON

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