SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
SSL/TLS Certificate for zoom.us
Valid- Issued by (CA)
- DigiCert Inc
- Subject
- *.zoom.us
- Valid from
- Dec 29, 2025
- Valid until
- Dec 29, 2026 (159 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 0BE17E1F6A86D60219A0310C0DDAF2CD
- SHA-256 fingerprint
- 09:4E:8C:85:30:0C:A1:52:37:D6:7C:A5:0A:B0:44:7D:B9:AB:37:7B:B3:E5:E5:A3:18:2C:20:9E:DC:2B:0F:D1
- Chain
- DigiCert Global G2 TLS RSA SHA256 2020 CA1 → DigiCert Global Root G2 → DigiCert Global Root CA
Certificate Authority Authorization (CAA)
The serving CA (DigiCert Inc) is authorized by this domain's CAA records (amazon.com, digicert.com, godaddy.com, letsencrypt.org, pki.goog, sectigo.com).
This certificate has been served since Jul 20, 2026.
Never get surprised by zoom.us's certificate expiring
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Uptime
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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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