Website Down Checker

See whether a site was up at our last check and when it last went down.

Current Status

Status
Active
Server Type
nginx/1.24.0 (Ubuntu)
Page Title
极引智算 - 让企业在 AI 时代被看见、被理解、被推荐
Meta Description
极引智算(上海)科技有限公司,专注 AI 搜索增长与 GEO 优化,帮助企业提升在 ChatGPT、DeepSeek、豆包、Kimi 等主流 AI 平台中的品牌可见度与内容引用率。
Meta Keywords
GEO,生成式引擎优化,AI搜索优化,极引智算,极引GEO Growth OS
Last Checked
just now
Last Status Change
Came back up — just now (11/2/2026)
Last Downtime
First seen down 26 days ago (10/7/2026), back up just now

Observed Changes

DateStatusServer
11/2/2026, 9:45:01 AMActivenginx/1.24.0 (Ubuntu)
10/7/2026, 1:54:17 AMInactiveUnknown

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 monitor with 7-day uptime percentage, failed checks, average latency by region, and daily outages

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.

Monitor uptime free

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.