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 sps-m.cz
Self-signed- Issued by (CA)
- debian.example.com
- Subject
- debian.example.com
- Valid from
- Oct 15, 2021
- Valid until
- Oct 13, 2031 (1861 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 57CE99B2DB37E3D111D9E84CE1F6AE3FE3A3BFA5
- SHA-256 fingerprint
- 78:10:3B:D5:F2:BA:15:93:6E:2F:EC:F7:96:B6:63:5A:EE:85:E0:F8:06:EB:51:95:F5:65:69:6A:91:DB:C2:C7
- Chain
- debian.example.com
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by sps-m.cz's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch sps-m.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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.