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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

aperture-labs.org · 195.191.197.11:443

Verified

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

Subject
CN=www.fiebig.nl
Issuer
C=US O=Let's Encrypt CN=YR1
Valid from
2026-09-23T15:46:54+00:00
Expires
2026-12-22T15:46:53+00:00
Days remaining
46
Serial (hex)
053EE9138F92969413BDC7CDE0736DAC2170
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

DNS:aperture-labs.org, DNS:fiebig.at, DNS:fiebig.nl, DNS:www.aperture-labs.org, DNS:www.fiebig.at, DNS:www.fiebig.nl

SHA-256 fingerprint

61:24:65:34:6E:8F:38:47:72:A6:B1:DA:1A:7D:FD:F9:14:15:F7:8E:1A:AB:62:65:31:99:4C:35:B4:C8:B7:AC
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
BF:81:06:B6:90:36:6F:ED:38:91:28:0A:F7:0E:1B:EE:E6:59:6A:ED
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:aperture-labs.org, DNS:fiebig.at, DNS:fiebig.nl, DNS:www.aperture-labs.org, DNS:www.fiebig.at, DNS:www.fiebig.nl
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://yr1.c.lencr.org/113.crl
ct_precert_scts
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 23 16:45:24.872 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:79:FF:0A:21:37:FA:57:E9:E5:EC:96:3C: 23:4F:18:5C:EA:6A:50:E1:D0:8D:8D:E3:42:B8:8E:1B: D6:84:32:0B:02:21:00:BE:14:57:BA:66:2A:52:E7:91: 6E:57:7B:32:2E:26:EC:11:16:3C:4D:60:97:45:3A:4B: 80:83:0A:44:EA:C5:48 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 46:AF:86:3D:3B:3E:E5:9F:A5:77:DE:A8:24:5D:36:B0: D9:ED:22:A2:23:F4:61:77:41:22:94:52:EE:95:50:5F Timestamp : Sep 23 16:45:24.935 2026 GMT Extensions: 00:00:05:00:34:6C:25:DA Signature : ecdsa-with-SHA256 30:44:02:20:5C:9C:B6:76:30:64:00:46:02:56:B1:2C: C6:AC:AE:F3:90:DE:55:7A:7C:FA:9D:C9:F0:85:11:E9: D8:79:B3:99:02:20:28:B0:EB:DA:83:69:A0:CB:22:B1: 7A:09:6C:31:E7:B8:1E:0E:C9:B4:92:36:40:F6:A4:29: 3D:AE:FF:1A:29:BB
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-11-05T16:02:35+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
667
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
2128
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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