Website Down Checker
See whether a site was up at our last check and when it last went down.
cper.cn
Uptime & Server Information
Current Status
Observed Changes
| Date | Status | Server |
|---|---|---|
| 6/9/2026, 12:41:24 PM | Active | nginx |
| 5/15/2026, 12:08:52 AM | Active | nginx |
| 5/5/2026, 9:31:10 PM | Active | nginx |
| 4/16/2026, 6:53:12 PM | Active | nginx |
| 3/31/2026, 9:21:18 PM | Inactive | Unknown |
| 2/25/2026, 11:12:24 AM | Active | nginx |
| 2/12/2026, 10:05:30 AM | Inactive | Unknown |
| 2/10/2026, 8:39:05 PM | Inactive | Unknown |
| 11/6/2025, 10:32:37 AM | Active | Nginx Microsoft-HTTPAPI/2.0 |
| 10/28/2025, 8:17:59 AM | Active | Nginx Microsoft-HTTPAPI/2.0 |
| 8/10/2025, 2:50:18 PM | Inactive | Unknown |
| 5/18/2025, 10:08:15 AM | Active | Nginx Microsoft-HTTPAPI/2.0 |
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.