How do I check if a website is down?

Enter any URL into the isitdown.io checker. We test with 4 independent probe methods (HTTP/1.1 strict TLS, HTTP/2 relaxed TLS, a browser User-Agent GET, and a curl-style HEAD) in parallel and show results within seconds, including HTTP status, response time per method, and a 24-hour history graph.

Is it down for everyone or just me?

isitdown.io checks with 4 independent probe methods (HTTP/1.1, HTTP/2, a browser User-Agent GET, and a curl-style HEAD) simultaneously. If all methods reach the site, the issue is local to you, try flushing DNS, switching networks, or using a VPN. If two or more methods fail, the service is down for everyone.

Yes, checking any site is free with no account required, including status badges, per-method history, and the cloud-cascade tracker. A free account adds 5 saved monitors with email alerts. Optional plans raise the limits and remove ads: Pro at $4.99/month (30 monitors) and Max at $12.99/month (200 monitors).

已收录 1196 项服务 · 4 种方式 · 每 5 分钟检测

是否宕机?
立即检测。

检测网站、Minecraft 服务器、游戏服务器或状态发布方 -- 以 4 种方式并行实时探测。

粘贴任何域名、ip:端口或服务名称。我们自动识别要检测的内容。

试试

真实探测数据 -- 而非用户上报。每次检测都并行使用四种方式： HTTP/1.1, HTTP/2, browser UA, curl HEAD ，每 5 分钟一次。

Don't just check once — watch it.

Save any site, game server, or status page as a monitor. We probe it 4 ways around the clock and email you the moment it goes down — so you hear it from us, not from your users.

5 monitors, checked every 5 minutes — websites, exact pages, Minecraft & Source servers
Email alerts, plus cert & domain-expiry warnings
Vendor status-feed watches · 7-day history · badges

Start monitoring — free No credit card — includes a free 14-day Pro trial. Pro from $4.99/mo — 1-minute checks, webhook + Discord alerts, a public status page & no ads.

浏览实时状态

10 条链的出块新鲜度 + RPC 检测

43 个服务器的实时在线人数

CS2、TF2、Rust、Ark + Steam 与 Roblox

/games →

AI 服务商

OpenAI、Anthropic、Groq 等, 状态与延迟