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 zjh.at
Untrusted chain- Issued by (CA)
- Let's Encrypt
- Subject
- zjh.at
- Valid from
- Jul 3, 2026
- Valid until
- Oct 1, 2026 (28 days remaining)
- Public key
- EC 256-bit
- Serial
- 05E5B8B0A2AF89020BCAA719234CBE94D1B7
- SHA-256 fingerprint
- A9:00:33:67:92:43:69:2A:88:9C:47:59:AC:D2:65:30:CA:8F:E9:03:99:DE:DE:7E:7B:6E:ED:C3:49:AA:6A:7E
- Chain
- —
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
This certificate has been served since Jul 29, 2026.
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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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