Website Down Checker
See whether a site was up at our last check and when it last went down.
zstec.cn
Uptime & Server Information
Current Status
Observed Changes
| Date | Status | Server |
|---|---|---|
| 10/20/2026, 6:15:07 AM | Active | nginx |
| 3/10/2026, 3:34:58 AM | Inactive | Unknown |
| 2/19/2026, 3:24:25 AM | Inactive | Unknown |
| 2/17/2026, 7:56:00 AM | Active | nginx |
| 2/3/2026, 1:52:37 PM | Active | nginx |
| 1/27/2026, 6:35:55 PM | Active | nginx |
| 1/22/2026, 9:43:17 PM | Inactive | Unknown |
| 1/4/2026, 6:14:14 PM | Inactive | Unknown |
| 12/13/2025, 6:35:15 PM | Active | nginx |
| 11/27/2025, 2:54:50 PM | Active | nginx |
| 8/12/2025, 6:58:16 PM | Inactive | Unknown |
| 5/15/2025, 9:29:37 AM | Inactive | Unknown |
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, 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.
Free for your first domain: uptime, DNS, and certificate together. No credit card.
About Website Uptime Monitoring
This page shows whether we could reach a website the last time we checked it. We also keep a record of when it went down and came back, so you can see whether an outage is new or has happened before. For each site we show:
- Website availability and response status
- Server software and configuration
- Meta information including titles and descriptions
- Historical uptime patterns
What this page reports
- Last status change: When we last saw a site switch between reachable and unreachable
- Last downtime: When a site was most recently seen down, and whether it has come back
- Server and meta information: The server software, page title and meta tags we last observed
We check a domain at most once a day and record an observation only when something changes, so these are the times a change was seen rather than the exact moment it happened. For continuous, minute-by-minute checks with alerting, use website monitoring.
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.