SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
check.work
SSL/TLS Certificate
SSL/TLS Certificate for check.work
Valid- Issued by (CA)
- Sectigo Limited
- Subject
- *.check.work
- Valid from
- Nov 17, 2025
- Valid until
- Nov 24, 2026 (90 days remaining)
- Public key
- RSA 2048-bit
- Serial
- A69EFE41B0C2DD5866197A8823D418EF
- SHA-256 fingerprint
- 8C:56:AD:B1:62:E6:56:C6:63:9F:73:1B:96:0C:47:F9:3B:FB:E2:D5:17:DC:D9:27:19:E8:AB:AB:C5:AD:2E:F4
- Chain
- Sectigo Public Server Authentication CA OV R36 → Sectigo Public Server Authentication Root R46 → USERTrust RSA Certification Authority
Certificate Authority Authorization (CAA)
The serving CA (Sectigo Limited) is authorized by this domain's CAA records (sectigo.com).
Never get surprised by check.work's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch check.work continuously, notifying you the moment anything moves across all three signals:
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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