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
2025-10-14T00:00:00+00:00
Expires
2026-11-10T23:59:59+00:00
Days remaining
35
Serial (hex)
0144F0341191A8DA06AF933197E6F15F
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:www.Downstate.Edu

SHA-256 fingerprint

A0:36:0E:20:26:97:ED:D1:6F:9E:80:95:23:37:87:D3:D4:3B:8B:54:91:8A:EA:7C:88:73:36:45:50:DB:10:DB
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
49:E6:8B:F0:C8:78:98:7C:FA:BA:F5:0F:D0:69:69:BC:4A:6D:87:18
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 : 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 : Oct 14 14:39:25.626 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:10:35:EF:73:06:2B:61:9F:DB:29:98:57: 23:55:9D:AF:8F:69:79:AE:8E:CB:E9:E7:8C:AD:BA:9B: 9D:88:E5:03:02:21:00:C1:B0:A5:D1:22:9F:A3:9F:0E: 91:50:14:32:2C:FC:13:05:09:F6:D6:98:F9:43:42:8B: CD:BE:06:6C:D3:B6:30 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 : Oct 14 14:39:25.643 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:0B:D6:DB:5D:27:3D:B6:D1:BE:C1:75:CC: BA:DC:3B:15:C7:DD:4E:3A:5F:4F:67:CA:E3:AA:84:77: 36:E7:82:F2:02:20:32:08:5B:1E:F2:37:96:31:5D:B5: B1:F9:3D:A3:A2:90:1B:8A:5F:DA:C2:0B:3A:A4:20:CB: 09:6A:4F:78:7F:E8 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 : Oct 14 14:39:25.663 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:97:12:F6:41:F7:28:E2:C6:59:9D:58: C6:93:BE:12:00:D7:3F:86:C4:EB:D9:DD:A7:A3:D2:53: CF:97:16:EA:5B:02:21:00:BE:7A:B8:B8:A9:73:AB:DA: 9C:D3:A5:AD:61:1D:B2:C7:B0:08:DA:5E:D2:F0:65:24: DE:5F:68:37:14:6D:C8:00
-----BEGIN CERTIFICATE-----
MIIG7DCCBdSgAwIBAgIQAUTwNBGRqNoGr5Mxl+bxXzANBgkqhkiG9w0BAQsFADBZ
MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMTMwMQYDVQQDEypE
aWdpQ2VydCBHbG9iYWwgRzIgVExTIFJTQSBTSEEyNTYgMjAyMCBDQTEwHhcNMjUx
MDE0MDAwMDAwWhcNMjYxMTEwMjM1OTU5WjCBgzELMAkGA1UEBhMCVVMxETAPBgNV
BAgTCE5ldyBZb3JrMREwDwYDVQQHEwhCcm9va2x5bjEyMDAGA1UEChMpU1VOWSBE
b3duc3RhdGUgSGVhbHRoIFNjaWVuY2VzIFVuaXZlcnNpdHkxGjAYBgNVBAMTEXd3
dy5Eb3duc3RhdGUuRWR1MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA
vpc7CZYfCb4EfzyADShVwzfX87PNuSmpO2EnvWWRkW/AB7D6EKGt3dm1fVA4zY7X
Dzelstqo43DzJLCvmdmrOIZISZ0Q3akAqeWfpK2IzWO91V12Tj4InQkHTH6npETi
6n3A/DvpmhzPRu3/6LDia1PSzBrR7GweiXuOqdrZ3Tb6POJ2iQbhcla3ZKufJqgP
ptUSscOu/NVGz719RLYq/oVglqKigQpnhImwS6/Mt8STSR3gaja56x65ArmWjyY0
mmNHaklcfA8Y6ZGS96Qtdbvw2FIS/Id9nlVkBkbFR3m5FwOP1FSf9s5Ti0Hvs4kI
N5/ZNAViPF5aHHKFohEXSQIDAQABo4IDgzCCA38wHwYDVR0jBBgwFoAUdIWAwGbH
3zfez70pN6oDHb7tzRcwHQYDVR0OBBYEFEnmi/DIeJh8+rr1D9BpabxKbYcYMBwG
A1UdEQQVMBOCEXd3dy5Eb3duc3RhdGUuRWR1MD4GA1UdIAQ3MDUwMwYGZ4EMAQIC
MCkwJwYIKwYBBQUHAgEWG2h0dHA6Ly93d3cuZGlnaWNlcnQuY29tL0NQUzAOBgNV
HQ8BAf8EBAMCBaAwEwYDVR0lBAwwCgYIKwYBBQUHAwEwgZ8GA1UdHwSBlzCBlDBI
oEagRIZCaHR0cDovL2NybDMuZGlnaWNlcnQuY29tL0RpZ2lDZXJ0R2xvYmFsRzJU
TFNSU0FTSEEyNTYyMDIwQ0ExLTEuY3JsMEigRqBEhkJodHRwOi8vY3JsNC5kaWdp
Y2VydC5jb20vRGlnaUNlcnRHbG9iYWxHMlRMU1JTQVNIQTI1NjIwMjBDQTEtMS5j
cmwwgYcGCCsGAQUFBwEBBHsweTAkBggrBgEFBQcwAYYYaHR0cDovL29jc3AuZGln
aWNlcnQuY29tMFEGCCsGAQUFBzAChkVodHRwOi8vY2FjZXJ0cy5kaWdpY2VydC5j
b20vRGlnaUNlcnRHbG9iYWxHMlRMU1JTQVNIQTI1NjIwMjBDQTEtMS5jcnQwDAYD
VR0TAQH/BAIwADCCAX4GCisGAQQB1nkCBAIEggFuBIIBagFoAHYA2AlVO5RPev/I
FhlvlE+Fq7D4/F6HVSYPFdEucrtFSxQAAAGZ4ylnugAABAMARzBFAiAQNe9zBith
n9spmFcjVZ2vj2l5ro7L6eeMrbqbnYjlAwIhAMGwpdEin6OfDpFQFDIs/BMFCfbW
mPlDQovNvgZs07YwAHUAwjF+V0UZo0XufzjespBB68fCIVoiv3/Vta12mtkOUs0A
AAGZ4ylnywAABAMARjBEAiAL1ttdJz220b7Bdcy63DsVx91OOl9PZ8rjqoR3NueC
8gIgMghbHvI3ljFdtbH5PaOikBuKX9rCCzqkIMsJak94f+gAdwCUTkOH+uzB74Hz
GSQmqBhlAcfTXzgCAT9yZ31VNy4Z2AAAAZnjKWffAAAEAwBIMEYCIQCXEvZB9yji
xlmdWMaTvhIA1z+GxOvZ3aej0lPPlxbqWwIhAL56uLipc6vanNOlrWEdssewCNpe
0vBlJN5faDcUbcgAMA0GCSqGSIb3DQEBCwUAA4IBAQAsGmo3u9l0jmnBX0iEXAs9
SfZCAA8Y2Gu4/kxB+n27YphOXgiUsmyrPsR+EN1nvH0PVo9//BJkpGpBI4iLBV1Y
WWEEbvGWB7Qcw0vQwksmk0sIT3yrbVwngA2Qui39ypL0AUTv9T8grn/5ZKQZUH7P
wVjnl9IXPNRzpz4hfL9bu8ZoJ0IYzCkFW18j35L+jBkgQtyltTTB4kcAGi+HCawX
1pT1zvHe/RIopei/ED3N2FR9SzHmf9FBofhwiy1mxsMAEhkFAZsyCaHzJctdc7SL
MEEs/87CKZkeS+0AfG6Hc0FNMbS+XamgU7zODWeuV+ShdxYBV2YFfp6CWYS5M2bl
-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-10-06T21:36:20+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
1635
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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