SSL/TLS Certificate Lookup

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

outlook.com

SSL/TLS Certificate

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SSL/TLS Certificate for outlook.com

Valid

Issued by (CA): DigiCert Inc
Subject: outlook.com
Valid from: Jun 26, 2026
Valid until: Jan 10, 2027 (173 days remaining)
Public key: RSA 2048-bit
Serial: 0E371D2766FD365DADDCF4004297839E
SHA-256 fingerprint: 7C:25:36:90:B4:0A:77:B8:87:7B:07:B9:62:10:47:F7:1A:17:98:10:EC:53:6F:40:C6:9D:53:4E:86:CE:97:BA
Chain: DigiCert Global G2 TLS RSA SHA256 2020 CA1 → DigiCert Global Root G2

Subject Alternative Names (20)

*.hotmail.com, *.internal.outlook.com, *.live.com, *.office.com, *.office365.com, *.outlook.com, *.outlook.office365.com, attachment.outlook.live.net, attachment.outlook.office.net, attachment.outlook.officeppe.net, attachments-sdf.office.net, attachments.office.net, ccs.login.microsoftonline.com, hotmail.com, mail.services.live.com, office365.com, outlook.com, outlook.office.com, substrate-sdf.office.com, substrate.office.com

Certificate Authority Authorization (CAA)

The serving CA (DigiCert Inc) is authorized by this domain's CAA records (digicert.com, entrust.net, globalsign.com, microsoft.com).

This certificate has been served since Jul 20, 2026.