Website Uptime Monitor
Monitor website availability and server information for any domain
1sign.cn
Uptime & Server Information
Current Status
Historical Data
| Date | Status | Server |
|---|---|---|
| 7/27/2026, 9:37:39 PM | Active | Unknown |
| 7/25/2026, 11:54:16 PM | Inactive | Unknown |
| 11/2/2025, 3:13:55 PM | Active | Unknown |
| 7/21/2025, 9:39:18 PM | Active | Unknown |
| 5/28/2025, 6:37:20 AM | Active | Unknown |
| 5/2/2025, 6:30:21 PM | Active | Unknown |
| 4/6/2025, 2:08:34 PM | Active | Unknown |
| 3/1/2025, 4:23:12 AM | Active | Unknown |
| 2/21/2025, 5:21:42 PM | Active | 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, 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.