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

ns1.nette.pl · 193.138.118.3:443

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=lagoon.nette.pl
Issuer
C=US O=Let's Encrypt CN=R10
Valid from
2025-03-06T02:02:34+00:00
Expires
2025-06-04T02:02:33+00:00
Days remaining
-491
Serial (hex)
0427EFD84106DD4418ACDC8D3BCDC8C334A8
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

DNS:imap.nette.pl, DNS:lagoon.nette.pl, DNS:mail.nette.pl, DNS:nette.pl, DNS:pop3.nette.pl, DNS:smtp.nette.pl

SHA-256 fingerprint

D1:FD:B7:70:8C:1F:AA:FA:BA:98:9A:9D:5E:76:85:55:31:FB:4B:35:50:78:6B:75:54:46:4B:59:BD:16:23:DD
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
92:EB:5B:73:A0:76:B4:4C:8F:3D:8C:6F:CB:92:EE:25:CB:E0:65:49
authorityKeyIdentifier
BB:BC:C3:47:A5:E4:BC:A9:C6:C3:A4:72:0C:10:8D:A2:35:E1:C8:E8
authorityInfoAccess
OCSP - URI:http://r10.o.lencr.org CA Issuers - URI:http://r10.i.lencr.org/
subjectAltName
DNS:imap.nette.pl, DNS:lagoon.nette.pl, DNS:mail.nette.pl, DNS:nette.pl, DNS:pop3.nette.pl, DNS:smtp.nette.pl
certificatePolicies
Policy: 2.23.140.1.2.1
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : CC:FB:0F:6A:85:71:09:65:FE:95:9B:53:CE:E9:B2:7C: 22:E9:85:5C:0D:97:8D:B6:A9:7E:54:C0:FE:4C:0D:B0 Timestamp : Mar 6 03:01:05.011 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:C2:B2:BD:9A:B9:7E:34:B1:F5:CD:AF: 8B:D4:47:99:9A:6B:05:0F:1D:75:2A:58:D6:DF:2E:C6: 12:55:C1:CA:ED:02:21:00:E5:4E:2C:CE:75:A7:C8:DB: EC:41:54:DF:63:CD:E3:F3:58:54:F1:CA:98:45:89:D4: B6:12:11:02:86:41:E5:24 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : A2:E3:0A:E4:45:EF:BD:AD:9B:7E:38:ED:47:67:77:53: D7:82:5B:84:94:D7:2B:5E:1B:2C:C4:B9:50:A4:47:E7 Timestamp : Mar 6 03:01:05.010 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:A7:A8:18:97:D4:5E:33:C4:50:91:6F: 60:9F:9C:C3:C7:3E:F4:37:28:53:86:3B:17:38:D3:58: E2:E9:A3:C7:A1:02:21:00:B2:8F:38:16:5B:DC:A8:AC: 6D:C8:B2:6C:61:3D:8F:86:4B:42:ED:71:BA:B8:9A:37: E8:5F:7E:4A:9D:04:9B:E1
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-10-07T12:15:28+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
696
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
2157
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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