SSL/TLS Certificate Lookup

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

hotmail.com

SSL/TLS Certificate

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SSL/TLS Certificate for hotmail.com

Valid

Issued by (CA): Microsoft Corporation
Subject: outlook.live.com
Valid from: Mar 4, 2026
Valid until: Feb 27, 2027 (221 days remaining)
Public key: RSA 2048-bit
Serial: 5500081B0944DA4611AD585CDC000000081B09
SHA-256 fingerprint: 85:16:52:B4:62:CC:AF:CA:52:A4:76:C8:2A:7B:44:96:9F:9B:CF:AC:7D:46:C2:1D:9E:99:86:0B:B9:D7:E9:0A
Chain: Microsoft TLS G2 RSA CA OCSP 16 → Microsoft TLS RSA Root G2 → DigiCert Global Root G2

Subject Alternative Names (12)

*.calendar.live.com, *.fp.measure.office.com, *.hotmail.com, *.live.com, *.mail.live.com, attachment.outlook.office.net, attachment.outlook.officeppe.net, hotmail.com, live.com, outlook-sdf.live.com, outlook.live.com, premium.outlook.com

Certificate Authority Authorization (CAA)

CAA restricts issuance to digicert.com, globalsign.com, microsoft.com; we couldn't map the serving CA (Microsoft Corporation) to one of these identifiers.

This certificate has been served since Jul 20, 2026.