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

downstate.edu · 138.5.248.46:443

Unverified
Certificate verification failed. These are unverified certificate details presented by the server. Peer certificate subjectAltName did not match expected name `downstate.edu'

Certificate verification failed

Subject
C=US ST=New York L=Brooklyn O=SUNY Downstate Health Sciences University CN=www.Downstate.Edu
Issuer
C=US O=DigiCert Inc CN=DigiCert Global G2 TLS RSA SHA256 2020 CA1
Valid from
2026-11-03T00:00:00+00:00
Expires
2027-05-20T23:59:59+00:00
Days remaining
195
Serial (hex)
0A0560E551630F9619CFAFABF7E85298
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:www.Downstate.Edu

SHA-256 fingerprint

6D:2F:17:1B:A3:BE:92:C2:2B:04:38:25:82:A6:62:67:6D:A0:F1:02:1F:E6:F9:67:9E:8B:EC:76:94:57:58:22
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
EE:1F:27:99:D6:2F:F9:BB:69:D7:89:01:64:3B:C9:B1:6A:56:06:E9
subjectAltName
DNS:www.Downstate.Edu
certificatePolicies
Policy: 2.23.140.1.2.2 CPS: http://www.digicert.com/CPS
keyUsage
Digital Signature, Key Encipherment
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 : 4C:63:DC:98:E5:9C:1D:AB:88:F6:1E:8A:3D:DE:AE:8F: AB:44:A3:37:7B:5F:9B:94:C3:FB:A1:9C:FC:C1:BE:26 Timestamp : Nov 3 14:08:03.113 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:BE:9D:19:4A:DB:AA:95:30:2A:55:36: AF:6C:B1:2F:A0:2D:DF:6F:64:3B:67:15:2B:C5:F6:DE: ED:62:55:69:0B:02:21:00:BF:1B:58:14:C0:89:41:6E: D5:4D:53:95:68:0E:A4:B2:11:B2:F1:20:25:7A:85:94: 72:FD:28:4B:FB:95:09:76 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : D6:D5:8D:A9:D0:17:53:F3:6A:4A:A0:C7:57:49:02:AF: EB:C7:DC:2C:D3:8C:D9:F7:64:C8:0C:89:19:1E:9F:02 Timestamp : Nov 3 14:08:03.113 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:5A:97:85:81:2D:DF:7D:12:BD:B8:7A:BB: C6:DD:C0:2E:7C:02:82:37:7E:1B:D5:32:17:73:07:B7: 1C:99:90:18:02:20:14:14:EC:99:57:C2:2D:83:77:41: FB:AC:E2:4E:6C:76:E3:41:53:DC:25:F2:8D:F8:46:C9: F6:3C:90:22:CD:FF Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 44:C2:BD:0C:E9:14:0E:64:A5:C9:4A:01:93:0A:5A:A1: BB:35:97:0E:00:EE:11:16:89:68:2A:1C:44:D7:B5:66 Timestamp : Nov 3 14:08:03.273 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:8A:C0:37:8A:DD:83:A5:6A:8A:C8:0A: 1F:2D:D5:79:48:DE:AF:6E:5A:A5:7F:18:AB:63:59:A3: DE:91:81:8E:80:02:20:5E:85:C0:21:C5:EA:79:06:42: B6:65:41:E1:E1:39:D7:08:3C:B7:6B:65:C1:F1:A4:C8: F2:24:B1:FF:D1:42:7E
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-11-06T07:57:09+00:00

Server-presented chain · 1 additional certificate

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
1604
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-----

One endpoint on port 443. Server-presented chain; no revocation, OCSP, CT or full TLS security scan.

View certificate JSON

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