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
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 (220 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
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.
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Uptime
We visit the site from multiple regions worldwide and email you within minutes if it goes down, with a per-region breakdown so a real outage stands out from a regional blip.
DNS changes
We watch NS, MX, CAA, DNSSEC, CNAME and A/AAAA records, and identify the host, network, and ASN behind them, so a real migration or hijack stands out from routine noise.
TLS certificate
We warn you 30, 14, 7, and 1 days before it expires, and flag it if the issuing authority changes or the certificate is unexpectedly replaced.
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