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

ibykus.de · 88.99.235.250:443

Verified

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

Subject
CN=www.ibykus.de
Issuer
C=US O=Let's Encrypt CN=YR1
Valid from
2026-10-18T17:32:39+00:00
Expires
2027-01-16T17:32:38+00:00
Days remaining
86
Serial (hex)
067A64A5DA9413E780C7F73D59F3909393D3
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:blog.ibykus.de, DNS:goibykus.de, DNS:ibykus.com, DNS:ibykus.de, DNS:ibykus.net, DNS:www.analyticsstudio.de, DNS:www.center-of-applied-ai.de, DNS:www.coaai.de, DNS:www.extensibilityhub.de, DNS:www.goibykus.de, DNS:www.ibykus.com, DNS:www.ibykus.de, DNS:www.ibykus.net, DNS:www.observabilityhub.de, DNS:www.openwingsconnect.de, DNS:www.synergy-hubs.de

SHA-256 fingerprint

7B:63:AC:67:E2:E5:C3:F9:1A:04:72:C8:C2:6E:23:A3:47:B9:A9:31:08:B7:44:66:12:90:30:AD:58:A5:2C:E8
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
49:12:86:66:5F:D2:A4:FC:2E:F2:A2:AC:47:3E:5E:E1:F8:34:87:27
authorityKeyIdentifier
1F:2F:35:BE:46:14:82:CD:40:B1:AE:79:2C:55:78:FA:F7:D4:68:FB
authorityInfoAccess
CA Issuers - URI:http://yr1.i.lencr.org/
subjectAltName
DNS:blog.ibykus.de, DNS:goibykus.de, DNS:ibykus.com, DNS:ibykus.de, DNS:ibykus.net, DNS:www.analyticsstudio.de, DNS:www.center-of-applied-ai.de, DNS:www.coaai.de, DNS:www.extensibilityhub.de, DNS:www.goibykus.de, DNS:www.ibykus.com, DNS:www.ibykus.de, DNS:www.ibykus.net, DNS:www.observabilityhub.de, DNS:www.openwingsconnect.de, DNS:www.synergy-hubs.de
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr1.c.lencr.org/84.crl
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 59:6E:6C:33:86:94:B2:59:72:A2:56:C8:A0:E8:DD:90: 4A:76:E8:08:3D:DA:87:3B:01:08:38:28:14:3C:EE:59 Timestamp : Oct 18 18:31:09.767 2026 GMT Extensions: 00:00:05:00:0F:DF:B0:F9 Signature : ecdsa-with-SHA256 30:44:02:20:52:74:02:C5:F3:6C:05:A0:CE:D3:26:46: 4E:02:38:B4:47:C3:96:D9:FC:51:0D:39:D8:40:B8:D9: 4E:21:81:9F:02:20:72:47:55:A9:AA:95:88:58:D6:DD: C3:58:F4:3D:11:66:B7:BF:4B:E9:2D:87:39:95:AD:2D: 65:2F:C3:98:59:E3 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 60:4C:9A:AF:7A:7F:77:5F:01:D4:06:FC:92:0D:C8:99: EB:0B:1C:7D:F8:C9:52:1B:FA:FA:17:77:3B:97:8B:C9 Timestamp : Oct 18 18:31:09.903 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:40:94:72:ED:F0:1A:D9:9C:5B:61:EF:B0: CB:7D:6C:BE:F2:47:EE:13:4C:8B:92:FE:EE:54:B7:B0: 49:94:33:EB:02:21:00:A5:A6:C7:8F:79:EB:07:BA:67: 4B:29:DB:28:7C:CC:08:14:DC:66:53:E4:5D:EB:FB:0E: 59:0C:A4:D7:AC:78:55
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-10-21T19:18:21+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=US O=Let's Encrypt CN=YR1
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
682
Serial (hex)
A20253F15F2691C05DC1CE13B9BCCA4E
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

13:94:96:34:D9:9C:D6:FD:6A:A8:0B:C0:34:FE:FA:CC:EB:19:69:FE:EF:98:65:86:71:3E:CD:BB:05:75:8D:3F
Certificate extensions & PEM
keyUsage
Digital Signature, Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:TRUE, pathlen:0
subjectKeyIdentifier
1F:2F:35:BE:46:14:82:CD:40:B1:AE:79:2C:55:78:FA:F7:D4:68:FB
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
2143
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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