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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

duck.com · 52.142.124.215:443

Verified

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

Subject
C=US ST=Pennsylvania L=Paoli O=Duck Duck Go, Inc. CN=*.duck.com
Issuer
C=US O=DigiCert Inc CN=DigiCert Global G2 TLS RSA SHA256 2020 CA1
Valid from
2026-09-17T00:00:00+00:00
Expires
2026-12-15T23:59:59+00:00
Days remaining
69
Serial (hex)
07A6FA8812192C9F896EB98BBF2B5923
Signature
RSA-SHA256
Public key
EC 256 prime256v1

Subject alternative names (SAN)

DNS:*.duck.com, DNS:duck.com

SHA-256 fingerprint

C6:2F:D7:44:82:F9:8A:8F:C2:BF:0E:61:5B:DB:5C:B3:9F:CA:80:BB:48:DE:B9:73:20:F4:BA:45:42:15:76:D6
Certificate extensions & PEM
authorityKeyIdentifier
74:85:80:C0:66:C7:DF:37:DE:CF:BD:29:37:AA:03:1D:BE:ED:CD:17
subjectKeyIdentifier
FE:60:27:D2:F0:10:BE:04:59:2E:DA:63:FD:A8:08:70:4D:87:DD:C7
subjectAltName
DNS:*.duck.com, DNS:duck.com
certificatePolicies
Policy: 2.23.140.1.2.2 CPS: http://www.digicert.com/CPS
keyUsage
Digital Signature, Key Agreement
extendedKeyUsage
TLS Web Server Authentication
crlDistributionPoints
Full Name: URI:http://crl3.digicert.com/DigiCertGlobalG2TLSRSASHA2562020CA1-1.crl Full Name: URI:http://crl4.digicert.com/DigiCertGlobalG2TLSRSASHA2562020CA1-1.crl
authorityInfoAccess
OCSP - URI:http://ocsp.digicert.com CA Issuers - URI:http://cacerts.digicert.com/DigiCertGlobalG2TLSRSASHA2562020CA1-1.crt
basicConstraints
CA:FALSE
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : C2:31:7E:57:45:19:A3:45:EE:7F:38:DE:B2:90:41:EB: C7:C2:21:5A:22:BF:7F:D5:B5:AD:76:9A:D9:0E:52:CD Timestamp : Sep 17 03:23:21.341 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:03:0F:4F:6A:B1:5C:B4:F5:23:68:2B:DE: CB:3D:C2:51:5E:5E:8A:04:8A:20:82:64:97:83:46:72: 27:D3:D5:9A:02:20:69:9F:8D:9E:43:04:64:23:50:BA: 24:8F:E1:E2:42:96:C6:2E:B5:9D:3B:BC:9E:A1:98:EB: A0:35:09:25:46:33 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : D8:09:55:3B:94:4F:7A:FF:C8:16:19:6F:94:4F:85:AB: B0:F8:FC:5E:87:55:26:0F:15:D1:2E:72:BB:45:4B:14 Timestamp : Sep 17 03:23:21.348 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:61:AB:78:50:7A:F6:01:7C:37:AA:E5:6E: 97:48:1F:08:31:7C:01:AB:6B:84:5A:7A:AA:7E:CA:EC: 87:C8:BC:AB:02:20:07:16:AD:4A:CA:99:A6:33:D6:7C: 88:E6:14:4D:2C:D4:99:D6:8A:83:0E:1A:78:FC:D7:B7: 57:4D:74:74:E5:C3 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 94:4E:43:87:FA:EC:C1:EF:81:F3:19:24:26:A8:18:65: 01:C7:D3:5F:38:02:01:3F:72:67:7D:55:37:2E:19:D8 Timestamp : Sep 17 03:23:21.348 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:DD:DB:F3:83:F4:01:3E:46:1C:5B:7A: AD:D9:83:2D:50:6F:AB:29:56:09:AC:93:1E:DC:AA:32: 56:EB:7D:4A:D4:02:20:41:56:56:7B:32:95:CA:92:1C: F4:A9:2A:06:F7:E2:4D:03:1B:8F:D1:F8:CB:E3:A3:D5: DA:12:18:D3:D7:AC:05
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-10-07T15:31:03+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=US O=DigiCert Inc CN=DigiCert Global G2 TLS RSA SHA256 2020 CA1
Issuer
C=US O=DigiCert Inc OU=www.digicert.com CN=DigiCert Global Root G2
Valid from
2021-03-30T00:00:00+00:00
Expires
2031-03-29T23:59:59+00:00
Days remaining
1634
Serial (hex)
0CF5BD062B5602F47AB8502C23CCF066
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

C8:02:5F:9F:C6:5F:DF:C9:5B:3C:A8:CC:78:67:B9:A5:87:B5:27:79:73:95:79:17:46:3F:C8:13:D0:B6:25:A9
Certificate extensions & PEM
basicConstraints
CA:TRUE, pathlen:0
subjectKeyIdentifier
74:85:80:C0:66:C7:DF:37:DE:CF:BD:29:37:AA:03:1D:BE:ED:CD:17
authorityKeyIdentifier
4E:22:54:20:18:95:E6:E3:6E:E6:0F:FA:FA:B9:12:ED:06:17:8F:39
keyUsage
Digital Signature, Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
authorityInfoAccess
OCSP - URI:http://ocsp.digicert.com CA Issuers - URI:http://cacerts.digicert.com/DigiCertGlobalRootG2.crt
crlDistributionPoints
Full Name: URI:http://crl3.digicert.com/DigiCertGlobalRootG2.crl
certificatePolicies
Policy: 2.16.840.1.114412.2.1 Policy: 2.23.140.1.1 Policy: 2.23.140.1.2.1 Policy: 2.23.140.1.2.2 Policy: 2.23.140.1.2.3
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Chain certificate 2

Subject
C=US O=DigiCert Inc OU=www.digicert.com CN=DigiCert Global Root G2
Issuer
C=US O=DigiCert Inc OU=www.digicert.com CN=DigiCert Global Root G2
Valid from
2013-08-01T12:00:00+00:00
Expires
2038-01-15T12:00:00+00:00
Days remaining
4117
Serial (hex)
033AF1E6A711A9A0BB2864B11D09FAE5
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

CB:3C:CB:B7:60:31:E5:E0:13:8F:8D:D3:9A:23:F9:DE:47:FF:C3:5E:43:C1:14:4C:EA:27:D4:6A:5A:B1:CB:5F
Certificate extensions & PEM
basicConstraints
CA:TRUE
keyUsage
Digital Signature, Certificate Sign, CRL Sign
subjectKeyIdentifier
4E:22:54:20:18:95:E6:E3:6E:E6:0F:FA:FA:B9:12:ED:06:17:8F:39
-----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.

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