SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
gen-yu.com.tw
SSL/TLS Certificate
SSL/TLS Certificate for gen-yu.com.tw
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- www.whetz.com.tw
- Valid from
- Sep 1, 2026
- Valid until
- Nov 30, 2026 (54 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 06EA0B0EDEAA52FBDA8C01A5239CA05D5782
- SHA-256 fingerprint
- A8:81:3B:0D:01:D0:D5:A9:C5:B5:33:9B:D4:6B:C0:ED:34:01:CC:51:B0:2C:C2:28:AF:E9:68:BB:79:BD:39:E7
- Chain
- YR2 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by gen-yu.com.tw's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch gen-yu.com.tw 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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