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 so-wh.at
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- so-wh.at
- Valid from
- Nov 2, 2026
- Valid until
- Jan 31, 2027 (79 days remaining)
- Public key
- EC 256-bit
- Serial
- 0508BC712617C9105555F0A143FF7A50D046
- SHA-256 fingerprint
- 8A:26:D7:D6:F6:2E:D2:76:7D:C8:24:FD:CD:DE:D4:E6:E5:07:D7:E5:FC:F5:DB:9A:87:F6:E5:2F:CA:CA:28:B6
- Chain
- YE2 → Root YE → ISRG Root X2 → ISRG Root X1
Certificate Authority Authorization (CAA)
The serving CA (Let's Encrypt) is authorized by this domain's CAA records (letsencrypt.org).
We've observed 1 previous certificate for this host. This certificate has been served since Oct 8, 2026.
Never get surprised by so-wh.at's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch so-wh.at 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, CNAME, TXT 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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