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 hls-sales.cz

Untrusted chain
Issued by (CA)
Synology Inc.
Subject
synology
Valid from
Aug 14, 2026
Valid until
Aug 15, 2027 (336 days remaining)
Public key
RSA 2048-bit
Serial
1706150662EDC8
SHA-256 fingerprint
1B:2F:00:99:38:D9:FE:C2:3B:87:1A:7C:5B:34:B9:99:97:D2:CF:47:88:AC:29:BD:1D:A7:8C:81:5E:A0:DB:FA
Chain
Subject Alternative Names (1)
synology

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 24, 2026.

Never get surprised by hls-sales.cz's certificate expiring

This is today's certificate. Turn on monitoring and we'll watch hls-sales.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.

Monitor this certificate free

Free for your first domain: uptime, DNS, and certificate together. No credit card.