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

dktelecom.net.br · 45.224.41.76:443

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=dktelecom.net.br
Issuer
C=US O=Let's Encrypt CN=R13
Valid from
2026-03-24T16:38:02+00:00
Expires
2026-06-22T16:38:01+00:00
Days remaining
-98
Serial (hex)
068827312A808871746A6A4E753B3DC8B3CA
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:dktelecom.net.br

SHA-256 fingerprint

E2:87:78:78:7E:56:04:FA:36:89:8A:06:78:89:45:F1:61:91:9A:85:00:51:60:57:93:72:CD:F5:5E:42:35:1E
Certificate extensions & PEM
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
basicConstraints
CA:FALSE
subjectKeyIdentifier
CD:62:AF:1F:AC:25:7C:D6:FC:94:24:DD:56:DB:20:66:99:9D:70:41
authorityKeyIdentifier
E7:AB:9F:0F:2C:33:A0:53:D3:5E:4F:78:C8:B2:84:0E:3B:D6:92:33
authorityInfoAccess
CA Issuers - URI:http://r13.i.lencr.org/
subjectAltName
DNS:dktelecom.net.br
certificatePolicies
Policy: 2.23.140.1.2.1
crlDistributionPoints
Full Name: URI:http://r13.c.lencr.org/75.crl
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 64:11:C4:6C:A4:12:EC:A7:89:1C:A2:02:2E:00:BC:AB: 4F:28:07:D4:1E:35:27:AB:EA:FE:D5:03:C9:7D:CD:F0 Timestamp : Mar 24 17:36:32.510 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:59:B8:82:58:0C:FE:A9:79:B3:BF:51:E7: EE:59:21:32:65:5E:6A:3B:F6:E2:FD:98:D3:8A:A5:5B: 55:E8:23:87:02:21:00:BF:47:94:A5:FF:58:BE:6F:0F: 56:6D:E7:4E:22:E2:64:BD:F4:A4:01:6F:A3:F0:87:F7: 19:E6:44:C7:63:31:38 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : CB:38:F7:15:89:7C:84:A1:44:5F:5B:C1:DD:FB:C9:6E: F2:9A:59:CD:47:0A:69:05:85:B0:CB:14:C3:14:58:E7 Timestamp : Mar 24 17:36:32.570 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:0B:55:6C:D3:EB:B8:B4:1A:DC:2D:7A:17: F1:E7:C4:DF:18:E0:D6:11:36:25:47:5E:72:80:FA:DE: 0D:4C:AF:C5:02:21:00:F5:FF:77:67:3F:E7:02:C2:4A: 6D:42:1F:99:5E:F3:EF:5A:03:E6:1B:46:57:32:CB:04: 51:21:94:E6:A1:0B:6F
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: ECDHE-RSA-AES128-GCM-SHA256 · Checked 2026-09-28T03:18:32+00:00

Server-presented chain · 1 additional certificate

Chain certificate 1

Subject
C=US O=Let's Encrypt CN=R13
Issuer
C=US O=Internet Security Research Group CN=ISRG Root X1
Valid from
2024-03-13T00:00:00+00:00
Expires
2027-03-12T23:59:59+00:00
Days remaining
165
Serial (hex)
5A00F212D8D4B480F3924157EA298305
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

D3:B1:28:21:6A:84:3F:8E:F1:32:15:01:F5:DF:52:A5:DF:52:93:9E:E2:C1:92:97:71:2C:D3:DE:4D:41:93:54
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
E7:AB:9F:0F:2C:33:A0:53:D3:5E:4F:78:C8:B2:84:0E:3B:D6:92:33
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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