Website Uptime Monitor
Monitor website availability and server information for any domain
arsta.cz
Uptime & Server Information
Current Status
Historical Data
| Date | Status | Server |
|---|---|---|
| 7/22/2026, 8:45:04 PM | Active | openresty/1.25.3.2 |
| 1/7/2026, 3:59:12 PM | Inactive | Unknown |
| 12/9/2025, 9:39:13 PM | Active | website-pro/9.1.21 |
| 9/6/2025, 9:59:20 AM | Active | openresty/1.25.3.1 |
| 8/19/2025, 4:34:03 AM | Active | openresty/1.25.3.1 |
| 8/14/2025, 12:31:30 PM | Inactive | Unknown |
| 7/15/2025, 1:20:09 PM | Active | openresty/1.25.3.1 |
| 6/24/2025, 4:34:59 PM | Active | website-pro/9.1.15 |
| 6/3/2025, 4:33:48 AM | Active | website-pro/9.1.14 |
| 5/29/2025, 4:18:02 AM | Active | website-pro/9.1.14 |
Don't just check uptime once — watch it 24/7
This is a one-time check. Turn on monitoring and we'll watch the domains that matter to you 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.
About Website Uptime Monitoring
Use the Who.is uptime information to track the availability and server information of websites. This helps track:
- Website availability and response status
- Server software and configuration
- Meta information including titles and descriptions
- Historical uptime patterns
This information is valuable for website owners, system administrators, and anyone interested in monitoring website reliability and performance.
Metrics we monitor
- Uptime percentage: The percentage of time your website is accessible
- Response time: How quickly your server responds to requests
- Status codes: HTTP response codes indicating server status
Disclaimer: Who.is is not affiliated with, endorsed by, or connected to any of the domains displayed on this page. We provide this information as a public service for informational purposes only.