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

caltech.edu · 52.26.125.194:443

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

Certificate verification failed

Subject
C=US ST=California O=California Institute of Technology CN=caltech.edu
Issuer
C=US O=InCommon, LLC CN=InCommon RSA OV SSL CA 3
Valid from
2026-06-12T00:00:00+00:00
Expires
2026-12-27T23:59:59+00:00
Days remaining
76
Serial (hex)
C76F8BC4F7CB03D077E84798E38DD109
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:caltech.edu, DNS:admissions.caltech.edu, DNS:alumni.caltech.edu, DNS:aphms.caltech.edu, DNS:bbe.caltech.edu, DNS:biology.caltech.edu, DNS:bond.caltech.edu, DNS:brinsonhub.caltech.edu, DNS:caltech.info, DNS:caltech.net, DNS:caltech.org, DNS:cd3.caltech.edu, DNS:cms.caltech.edu, DNS:cns.caltech.edu, DNS:csa.caltech.edu, DNS:eands.caltech.edu, DNS:eas.caltech.edu, DNS:ee.caltech.edu, DNS:einstein.caltech.edu, DNS:finaid.caltech.edu, DNS:galcit.caltech.edu, DNS:gps.caltech.edu, DNS:hpc.caltech.edu, DNS:hss.caltech.edu, DNS:imss.caltech.edu, DNS:jobs.caltech.edu, DNS:kiss.caltech.edu, DNS:lncrna.caltech.edu, DNS:mayo.caltech.edu, DNS:mems.caltech.edu, DNS:ogc.caltech.edu, DNS:pma.caltech.edu, DNS:quarantine.caltech.edu, DNS:registermydevice.caltech.edu, DNS:spamtrap.caltech.edu, DNS:srl.caltech.edu, DNS:studaff.caltech.edu, DNS:techer.caltech.edu, DNS:theory.caltech.edu, DNS:vis.caltech.edu, DNS:vision.caltech.edu, DNS:www.csa.caltech.edu, DNS:www.srl.caltech.edu, DNS:www.techer.caltech.edu

SHA-256 fingerprint

31:F2:C6:20:6E:A7:EA:B4:86:3A:D7:59:47:18:29:26:06:78:85:E2:1B:12:CD:37:A9:91:25:C0:51:48:F1:7C
Certificate extensions & PEM
authorityKeyIdentifier
DA:22:37:3F:E5:D3:74:DA:D9:79:3E:D1:72:6D:D5:93:4B:20:37:AF
subjectKeyIdentifier
1E:0A:1A:D2:AF:DB:EF:0A:3C:7F:60:12:0D:B6:91:D3:B9:9E:82:22
keyUsage
Digital Signature, Key Encipherment
basicConstraints
CA:FALSE
extendedKeyUsage
TLS Web Server Authentication
certificatePolicies
Policy: 2.23.140.1.2.2
crlDistributionPoints
Full Name: URI:http://crl.sectigo.com/InCommonRSAOVSSLCA3.crl
authorityInfoAccess
CA Issuers - URI:http://crt.sectigo.com/InCommonRSAOVSSLCA3.crt OCSP - URI:http://ocsp.sectigo.com
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : D7:6D:7D:10:D1:A7:F5:77:C2:C7:E9:5F:D7:00:BF:F9: 82:C9:33:5A:65:E1:D0:B3:01:73:17:C0:C8:C5:69:77 Timestamp : Jun 12 17:28:37.102 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:8F:46:82:AC:65:FD:DD:C7:19:93:0B: 13:00:19:D3:27:7C:49:DD:56:93:35:F8:CC:1F:A0:7F: A9:F4:29:5D:AE:02:21:00:EF:7E:D3:2A:7C:6E:45:3C: 30:D2:22:73:A4:18:24:92:36:D2:30:FD:A8:32:FD:2C: 28:96:DE:78:1F:EC:B3:C4 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : C8:A3:C4:7F:C7:B3:AD:B9:35:6B:01:3F:6A:7A:12:6D: E3:3A:4E:43:A5:C6:46:F9:97:AD:39:75:99:1D:CF:9A Timestamp : Jun 12 17:28:37.026 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:C3:1E:B6:C4:EB:33:8C:9B:8F:38:8B: 5C:59:FE:6D:F0:13:B7:72:04:AA:A1:CB:44:D8:C0:3F: E6:7C:AE:16:76:02:20:5F:D6:FD:E1:5E:A5:9D:AB:63: C5:95:DC:28:40:7C:F2:53:31:7E:EE:E1:6E:E2:8B:8E: 96:E3:04:2E:46:56:EB Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 8E:CA:47:0B:AC:DE:6A:F3:A2:06:B0:A4:7A:84:B7:46: FE:1F:C6:BF:95:3E:25:E6:9B:4E:E4:02:48:F3:C6:E8 Timestamp : Jun 12 17:28:37.140 2026 GMT Extensions: 00:00:05:00:03:B3:CC:6A Signature : ecdsa-with-SHA256 30:44:02:20:72:8D:A4:9C:28:45:8B:11:BC:73:B2:99: F1:EB:23:DA:30:09:AF:BA:B1:3C:E4:6E:7A:59:80:D4: E5:B9:5D:0A:02:20:78:AA:AD:BC:3E:3F:F8:32:9B:CA: BD:FB:FB:3E:38:E0:A2:0B:EB:DF:71:29:6D:AF:A0:CC: 6E:2E:D6:42:51:16
subjectAltName
DNS:caltech.edu, DNS:admissions.caltech.edu, DNS:alumni.caltech.edu, DNS:aphms.caltech.edu, DNS:bbe.caltech.edu, DNS:biology.caltech.edu, DNS:bond.caltech.edu, DNS:brinsonhub.caltech.edu, DNS:caltech.info, DNS:caltech.net, DNS:caltech.org, DNS:cd3.caltech.edu, DNS:cms.caltech.edu, DNS:cns.caltech.edu, DNS:csa.caltech.edu, DNS:eands.caltech.edu, DNS:eas.caltech.edu, DNS:ee.caltech.edu, DNS:einstein.caltech.edu, DNS:finaid.caltech.edu, DNS:galcit.caltech.edu, DNS:gps.caltech.edu, DNS:hpc.caltech.edu, DNS:hss.caltech.edu, DNS:imss.caltech.edu, DNS:jobs.caltech.edu, DNS:kiss.caltech.edu, DNS:lncrna.caltech.edu, DNS:mayo.caltech.edu, DNS:mems.caltech.edu, DNS:ogc.caltech.edu, DNS:pma.caltech.edu, DNS:quarantine.caltech.edu, DNS:registermydevice.caltech.edu, DNS:spamtrap.caltech.edu, DNS:srl.caltech.edu, DNS:studaff.caltech.edu, DNS:techer.caltech.edu, DNS:theory.caltech.edu, DNS:vis.caltech.edu, DNS:vision.caltech.edu, DNS:www.csa.caltech.edu, DNS:www.srl.caltech.edu, DNS:www.techer.caltech.edu
-----BEGIN CERTIFICATE-----
MIIJ0TCCCDmgAwIBAgIRAMdvi8T3ywPQd+hHmOON0QkwDQYJKoZIhvcNAQELBQAw
SDELMAkGA1UEBhMCVVMxFjAUBgNVBAoTDUluQ29tbW9uLCBMTEMxITAfBgNVBAMT
GEluQ29tbW9uIFJTQSBPViBTU0wgQ0EgMzAeFw0yNjA2MTIwMDAwMDBaFw0yNjEy
MjcyMzU5NTlaMGUxCzAJBgNVBAYTAlVTMRMwEQYDVQQIEwpDYWxpZm9ybmlhMSsw
KQYDVQQKEyJDYWxpZm9ybmlhIEluc3RpdHV0ZSBvZiBUZWNobm9sb2d5MRQwEgYD
VQQDEwtjYWx0ZWNoLmVkdTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEB
AL3G3/lJ4tfJ+LSCWll4ewfjJQeZBe29G5mFEk4f2Ak8OZewG9gEJZasy/YKSuqH
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TBlERj38tVKa4BtYLTCZquzaC2fl0LOMLpQ1WrYGx7Hj/zLXtEQhmrIWR09Q4DfV
hW7HYXTpTh34zgVDVfIXq0UCAwEAAaOCBhcwggYTMB8GA1UdIwQYMBaAFNoiNz/l
03Ta2Xk+0XJt1ZNLIDevMB0GA1UdDgQWBBQeChrSr9vvCjx/YBINtpHTuZ6CIjAO
BgNVHQ8BAf8EBAMCBaAwDAYDVR0TAQH/BAIwADATBgNVHSUEDDAKBggrBgEFBQcD
ATATBgNVHSAEDDAKMAgGBmeBDAECAjA/BgNVHR8EODA2MDSgMqAwhi5odHRwOi8v
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sKR6hLdG/h/Gv5U+JeabTuQCSPPG6AAAAZ684OoUAAgAAAUAA7PMagQDAEYwRAIg
co2knChFixG8c7KZ8esj2jAJr7qxPORuelmA1OW5XQoCIHiqrbw+P/gym8q9+/s+
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ZHWCEnRlY2hlci5jYWx0ZWNoLmVkdYISdGhlb3J5LmNhbHRlY2guZWR1gg92aXMu
Y2FsdGVjaC5lZHWCEnZpc2lvbi5jYWx0ZWNoLmVkdYITd3d3LmNzYS5jYWx0ZWNo
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Wm8TPmtZCPtOdUuXmaklFDjOFpY7igIajRYhNUMAI4s7G7Slnxnp6uGxQo1AnJI8
bg/lyE6hD8WmAgkB/F7gHwEBlpvbPi+FfKS/AMDURA4Fb9InMEdP7OHjoCHylzSC
WRx1WWQewGsL6RoYtB4NrubeNy6NAGQ+t1yFAoLhklEh+8WDeuaHuXHhcpRcg5V+
4jQsyG8457zVJQmiGw0GqdIBk7kx
-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-10-12T09:30:31+00:00

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

View certificate JSON

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