SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
yu-da.com.tw
SSL/TLS Certificate
SSL/TLS Certificate for yu-da.com.tw
Valid- Issued by (CA)
- Sectigo Limited
- Subject
- yu-da.com.tw
- Valid from
- Jan 29, 2026
- Valid until
- Mar 1, 2027 (200 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05F2D66B1033B659D5BA6B2BDCF1627C
- SHA-256 fingerprint
- EE:C6:F5:5D:FC:F9:06:B3:11:1C:AD:E7:90:CB:3F:43:14:06:E4:75:B0:89:46:5F:3C:9A:E2:C2:1F:FE:98:EB
- Chain
- Sectigo Public Server Authentication CA DV 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 (letsencrypt.org, sectigo.com).
Never get surprised by yu-da.com.tw's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch yu-da.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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