SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
sms-zdarmasms.cz
SSL/TLS Certificate
SSL/TLS Certificate for sms-zdarmasms.cz
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- sms-zdarmasms.cz
- Valid from
- Jul 12, 2026
- Valid until
- Oct 10, 2026 (55 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 05852E0566BE06E459EAB41A2406DF7058BA
- SHA-256 fingerprint
- 88:4D:88:22:F4:6C:18:25:A6:90:43:46:50:F3:25:58:B2:ED:90:D1:86:9C:F2:37:5A:DB:BF:CA:CA:EA:79:2A
- Chain
- YR2 → 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 sms-zdarmasms.cz's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch sms-zdarmasms.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, 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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