SSL/TLS Certificate Lookup

Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted

proofpoint.com

SSL/TLS Certificate

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SSL/TLS Certificate for proofpoint.com

Valid
Issued by (CA)
Sectigo Limited
Subject
www.proofpoint.com
Valid from
Jun 15, 2026
Valid until
Dec 27, 2026 (142 days remaining)
Public key
RSA 2048-bit
Serial
3D9A82431F4E9B72E8F6E05F7DB400CA
SHA-256 fingerprint
BB:57:03:F8:56:C0:CE:CF:93:50:39:BC:A9:1E:79:A9:49:48:7A:E5:AF:C9:03:84:DC:53:B9:B5:6A:F0:75:07
Chain
Sectigo Public Server Authentication CA OV R36 → Sectigo Public Server Authentication Root R46 → USERTrust RSA Certification Authority
Subject Alternative Names (59)
abaca.com, blog.proofpoint.com, brand.proofpoint.com, dev11.proofpoint.com, emergingthreats.net, emergingthreatspro.com, essentials.proofpoint.com, fortiva.com, insiderthreatmanagement.com, ipcheck.proofpoint.com, ipchecktest.proofpoint.com, jira.proofpoint.com, mobiledefense.proofpoint.com, netcitadel.com, nexgate.com, proofpoint.co.jp, proofpoint.co.uk, proofpoint.com, proofpoint.com.au, proofpoint.com.br, proofpoint.com.es, proofpoint.de, proofpoint.es, proofpoint.fr, proofpoint.it, proofpoint.jp, proofpoint.mx, proofpoint.uk, proofpoint.uk.com, proofpointessentials.com, proofpointprotect.proofpoint.com, sendmail.com, sigaba.com, stopemailfraud.proofpoint.com, translate.proofpoint.com, wiki.proofpoint.com, www.abaca.com, www.emergingthreats.net, www.emergingthreatspro.com, www.fortiva.com, www.netcitadel.com, www.nexgate.com, www.proofpoint.co.jp, www.proofpoint.co.uk, www.proofpoint.com, www.proofpoint.com.au, www.proofpoint.com.br, www.proofpoint.com.es, www.proofpoint.de, www.proofpoint.es, www.proofpoint.fr, www.proofpoint.it, www.proofpoint.jp, www.proofpoint.mx, www.proofpoint.uk, www.proofpoint.uk.com, www.proofpointessentials.com, www.sendmail.com, www.sigaba.com

Certificate Authority Authorization (CAA)

The serving CA (Sectigo Limited) is not among the authorities this domain's CAA records authorize (comodo.com, thawte.com). This can indicate a misconfiguration or an unexpected issuance.

This certificate has been served since Jul 31, 2026.

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Uptime

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DNS changes

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TLS certificate

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