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 sw-em.cz
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- sw-em.cz
- Valid from
- Oct 22, 2026
- Valid until
- Jan 20, 2027 (74 days remaining)
- Public key
- EC 256-bit
- Serial
- 066805AE6FC4238036772EDED1AB885DBBCD
- SHA-256 fingerprint
- CD:F5:3E:01:29:80:96:D1:F1:0B:84:D7:CD:84:DA:26:9C:20:3D:62:FD:3F:47:04:68:16:91:9A:C1:BD:8D:42
- Chain
- YE1 → Root YE → ISRG Root X2 → 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 sw-em.cz's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch sw-em.cz 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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