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 s-z-w.at
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- s-z-w.at
- Valid from
- Jul 25, 2026
- Valid until
- Oct 23, 2026 (70 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 0508F34DF7C0B70E3CB21DAFDEFF191DD47F
- SHA-256 fingerprint
- 46:7E:CC:BA:0A:45:30:C8:46:3A:98:B9:9F:BD:F6:E4:72:C6:BD:02:14:7E:24:2F:B2:0B:25:02:D4:73:11:A7
- Chain
- YR1 → 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 s-z-w.at's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch s-z-w.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, 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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