Website Uptime Monitor
Monitor website availability and server information for any domain
cssi.cn
Uptime & Server Information
Current Status
Historical Data
| Date | Status | Server |
|---|---|---|
| 7/27/2026, 2:57:56 AM | Active | nginx2018 |
| 6/30/2026, 7:32:54 AM | Active | nginx2018 |
| 6/9/2026, 5:22:59 AM | Active | nginx2018 |
| 5/21/2026, 7:57:24 PM | Active | nginx2018 |
| 5/16/2026, 12:41:05 PM | Active | nginx2018 |
| 5/15/2026, 12:36:16 AM | Active | nginx2018 |
| 5/5/2026, 11:09:29 PM | Active | nginx2018 |
| 3/13/2026, 4:47:14 PM | Inactive | Unknown |
| 2/26/2026, 9:34:20 PM | Active | nginx2018 |
| 2/25/2026, 4:44:44 AM | Active | nginx2018 |
| 2/15/2026, 9:27:42 PM | Inactive | Unknown |
| 2/9/2026, 10:19:28 AM | Inactive | Unknown |
| 2/5/2026, 8:19:41 PM | Active | nginx2018 |
| 2/2/2026, 8:30:09 PM | Inactive | Unknown |
| 1/23/2026, 12:26:33 AM | Inactive | Unknown |
| 12/21/2025, 12:46:51 AM | Inactive | Unknown |
| 12/19/2025, 9:54:56 AM | Inactive | Unknown |
| 10/19/2025, 4:46:48 PM | Active | nginx2018 |
| 10/17/2025, 6:19:43 PM | Active | nginx2018 |
| 9/12/2025, 4:11:27 PM | Active | nginx2018 |
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.