Reading the results
| State | Meaning |
|---|---|
| Online (2xx/3xx/4xx) | The server answered. A 4xx still means the server is up — the specific page may be missing or blocked. |
| Problem (5xx) | The server answered with an error: overloaded, misconfigured or under maintenance. |
| Offline | No answer: DNS failed, connection refused or timed out. |
Down for everyone or just me?
If a site is online here but not on your device, try: another network (mobile data), flushing your DNS cache, disabling VPN or browser extensions, or checking whether your ISP or company firewall blocks it. If it is offline here, check the domain's DNS with the DNS Records Checker and its expiry with the Whois Lookup — expired domains are a common cause.
Response time
Response time includes DNS, connection, TLS and the server producing the first response. Under 0.5 s is great, 0.5–1.5 s acceptable; consistently higher times hurt user experience and Core Web Vitals. Our checks run from a server in Europe, so distant servers show higher latency.
Downtime and SEO
Short outages do not hurt rankings. Extended 5xx errors make Google crawl less and, after days, drop pages. During planned maintenance, return 503 Service Unavailable with a Retry-After header so search engines know to come back.
For page-level codes across many URLs, use the HTTP Status Code Checker; for redirect details, the Redirect Checker.
Frequently asked questions
Is the website down for everyone or just me?
Check it here. If our server reaches it, the problem is on your network or device; if it fails here too, the site is down for everyone.
Why is a site online here but not in my browser?
Common causes are DNS caching, a VPN, browser extensions, or a firewall at your ISP or workplace.
Does downtime hurt SEO?
Short outages do not. Extended server errors make Google crawl less and can drop pages. Use a 503 status during maintenance.
What is a good server response time?
Under half a second is great; under 1.5 seconds is acceptable. Slower responses hurt user experience.
Can I check many websites at once?
Yes, up to 20 URLs per check.