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

gonicus.de · 128.140.50.119:443

Verified

Certificate chain, hostname and dates verified using this server’s CA store.

Subject
CN=www.gonicus.de
Issuer
C=US O=Let's Encrypt CN=YR2
Valid from
2026-10-06T17:22:22+00:00
Expires
2027-01-04T17:22:21+00:00
Days remaining
67
Serial (hex)
0635E0D0376DD80934371B61E773B82FDE7F
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:docs.gonicus.de, DNS:gonicus.de, DNS:gonnect-project.de, DNS:gonnect-project.org, DNS:gosa-project.de, DNS:gosa-project.org, DNS:stats.gonicus.de, DNS:www.gonicus.de, DNS:www.gonnect-project.de, DNS:www.gonnect-project.org, DNS:www.gosa-project.de, DNS:www.gosa-project.org, DNS:zeidyetutaurcheu.gonicus.de

SHA-256 fingerprint

FB:56:27:12:4F:0A:C6:77:58:DB:2D:06:09:E5:4B:08:54:7A:97:57:94:67:B9:43:1A:23:67:CC:AC:8C:8D:5F
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
C8:C0:13:4B:36:E9:96:F2:0C:DA:EB:04:99:23:C7:93:AE:A8:1D:9D
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:docs.gonicus.de, DNS:gonicus.de, DNS:gonnect-project.de, DNS:gonnect-project.org, DNS:gosa-project.de, DNS:gosa-project.org, DNS:stats.gonicus.de, DNS:www.gonicus.de, DNS:www.gonnect-project.de, DNS:www.gonnect-project.org, DNS:www.gosa-project.de, DNS:www.gosa-project.org, DNS:zeidyetutaurcheu.gonicus.de
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr2.c.lencr.org/128.crl
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 46:A2:39:67:C6:0D:B6:46:87:C6:6F:3D:F9:99:94:76: 93:A6:A6:11:20:84:57:D5:55:E7:E3:D0:A1:D9:B6:46 Timestamp : Oct 6 18:20:52.274 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:BC:0F:66:FF:FC:11:E0:E7:2A:3B:B4: 6A:46:8E:12:50:CE:FA:57:12:62:08:88:A3:06:4B:72: DE:07:34:0B:B9:02:20:4D:D9:07:49:BC:42:9F:5B:E1: 6B:5C:56:4E:00:C0:B5:DA:EE:BB:54:00:52:46:AB:CB: A1:21:84:A0:F3:DF:F6 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 1A:8B:9D:6B:8D:D7:91:D1:CD:05:49:ED:B6:03:55:D6: 06:B6:4F:AD:30:DB:71:FE:78:8F:0F:C7:C8:FB:C4:B1 Timestamp : Oct 6 18:20:53.579 2026 GMT Extensions: 00:00:05:00:05:F3:D5:B6 Signature : ecdsa-with-SHA256 30:46:02:21:00:D6:11:0C:DF:D5:4B:BF:00:AC:0C:C7: 1A:E6:D4:EA:27:5C:51:FD:1A:B4:CD:70:38:6F:CF:53: B7:75:F3:72:3F:02:21:00:D9:16:ED:67:64:96:C9:06: BE:FC:CB:95:DE:3F:57:AF:8C:68:92:29:32:4C:2A:5E: DB:62:B6:00:34:9D:F8:B1
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: ECDHE-RSA-AES128-GCM-SHA256 · Checked 2026-10-29T10:35:33+00:00

Server-presented chain · 2 additional certificates

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
674
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-----

Chain certificate 2

Subject
C=US O=ISRG CN=Root YR
Issuer
C=US O=Internet Security Research Group CN=ISRG Root X1
Valid from
2026-05-13T00:00:00+00:00
Expires
2032-09-02T23:59:59+00:00
Days remaining
2135
Serial (hex)
F24B6D17F9D9AD7CB1C9FEA78782699F
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

07:26:39:D0:B1:40:D5:BF:FA:E1:6A:D9:C3:F6:CC:60:86:04:06:21:F5:1E:E6:1A:6D:46:A8:91:5C:07:CF:76
Certificate extensions & PEM
keyUsage
Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:TRUE
subjectKeyIdentifier
DE:E7:5B:60:D0:22:6D:40:28:7D:3F:0D:01:FE:A4:B5:52:B4:51:94
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

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