nTools

Is it down?

Check if a website is down for everyone or just you, from six regions, with the HTTP status, response time, DNS and the domain’s registration status.

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How to use

Type the address of a site, such as example.com, and press Check. The tool checks the domain, its DNS and the web server, then answers the question at the top and shows the verdict: green when the site is online, amber when it answers with a problem, and red when it is offline. Each verdict comes with a short explanation and, where useful, what to do next.

Three things are checked: the domain’s public registration data (RDAP), to find a domain that has expired or been suspended; the DNS, to see whether the name exists and points to an IPv4 or IPv6 address; and a request to the site itself from a Cloudflare data centre near you, which follows up to 10 redirects and reads the HTTP status, the response time and the page title. At the same time, probes in six regions (Europe, North America, South America, Asia, Oceania and Africa) request the same address, so you can see whether the site fails everywhere or only in some places.

A site can look down when it is not. Many sites block automatic checks: a bot check such as Cloudflare’s, a firewall that refuses traffic from data centres, or a limit on requests. These answers show that the site is answering, so they are shown in amber as online with a problem, not as offline. The page title helps spot the opposite case: a maintenance page or a parked domain that answers normally but is not the real site.

The checks run from Cloudflare’s network and from the six regional probes, not from your connection. If a site is online here but does not open for you, the cause is probably on your side: an old DNS answer saved on your device, your network or provider, a VPN, a firewall or a browser extension. The result lists the usual fixes. If the site is offline here and in the regions too, it is most likely down for others as well. Each check gets its own address, which you can copy and send to someone.

The last 6 checks are kept in this browser only, so you can repeat them with one tap. The address you enter goes to the nTools server, which sends it to Cloudflare’s DNS resolver (or Google’s, if Cloudflare’s is unavailable), to rdap.org (which forwards it to the domain’s registry), to the site itself and to Globalping (an open network of probes developed by jsDelivr), which requests the site from six regions. Results are shared for up to 30 seconds (regional results for a minute, registration data for up to an hour), so many people checking the same site during an outage do not send it a flood of requests.

Example

Checks example.com, a domain reserved for examples. It is a live check, so the response time and details can change.

  • example.comOnline: HTTP 200 in about 0.3 seconds, with the site’s IPv4 and IPv6 addresses and the domain’s expiry date.
  • A shop protected by a Cloudflare bot checkProbably online, behind a bot check: the server answered, but asked to prove that the visitor is human.
  • A domain that was not renewedOffline, domain expired or suspended: the domain was put on hold, which removed it from DNS.
  • A site whose server stopped behind CloudflareOffline: error 521, meaning the site’s own server refused the connection, while Cloudflare in front of it is working.

Frequently asked questions

Is the site down for everyone or just me?

If this tool shows the site as offline here and in the regions, it is very likely down for others too, not only for you. If it shows it as online but it does not open for you, the problem is most likely your connection, your DNS or your browser. Try the steps shown with the result.

Why does it say a site is online when it does not open for me?

The checks run from Cloudflare’s network and from probes in six regions. Your device may have saved an old DNS answer, your provider or network may block the site, or a VPN, firewall or browser extension may get in the way. It can also be a problem in one area that none of the checks reached.

Why does it say the site refused the check?

Many sites block automatic requests that come from data centres, or limit how many requests they accept. A bot check, HTTP 403 or HTTP 429 shows that the site is answering, so the site is shown as online with a problem, not as offline. When the regional probes get normal answers, the site is shown as online.

What do errors such as 502, 503 or 521 mean?

Codes from 500 to 599 mean the server has a problem. 502 and 504 usually come from a proxy that could not get an answer from the server behind it, 503 means the service is unavailable or in maintenance, and 520 to 526 and 530 are Cloudflare codes for a site whose own server, behind Cloudflare, failed.

Does nTools keep the sites I check?

Your recent checks are kept only in this browser and you can clear them at any time. To run a check, the address goes to the nTools server and to Globalping’s probes. The nTools server keeps the result for up to 30 seconds (regional results for a minute, registration data for up to an hour) so it can be shared with others checking the same site, and does not store it after that.

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