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Privacy

Your own IP address

Every website receives your IP address: that's how the internet delivers a page to you. The What is my IP page simply shows it back to you, together with the network and approximate location that Cloudflare (which hosts this site) attaches to every request. None of it is stored by this site.

  • To show both your IPv4 and IPv6 address, your browser also asks ipify (api4.ipify.org and api6.ipify.org), a free public service that only answers with the address it sees. That request goes from your browser to ipify directly, so ipify sees your IP address too. This happens on the What is my IP, WebRTC leak test and IP lookup pages.
  • The WebRTC leak test makes your browser contact Cloudflare's public STUN server (stun.cloudflare.com), the same thing a video call does, to learn which address WebRTC would reveal. The comparison happens in your browser.
  • The port checker opens one connection from Cloudflare's network to your own IP address on the port you choose. It can't test any other address, and nothing is stored.

The domains, addresses and links you check

When you press Check, the name, address or link you typed is sent to this site's server, which asks the services that hold the answer and sends the result back. The site does not keep a record of what you checked. No log, no history, no link to you.

  • DNS tools and email checks ask public DNS resolvers over encrypted DNS-over-HTTPS: Cloudflare (1.1.1.1) by default, the resolver you pick in the DNS lookup, and for the propagation checker all seven (Cloudflare, Google Public DNS, Quad9, AdGuard DNS, OpenDNS, Mullvad DNS and AliDNS). They see the name being looked up, coming from this site's server, not from you.
  • WHOIS and IP lookup ask the official registry for that domain ending or address block (found through IANA's public list), over RDAP. The IP lookup also asks IPinfo (ipinfo.io) for the network name and country of the address you typed, when the site owner has switched that on.
  • Is it down?, the HTTP headers checker and the redirect checker make a normal request to the site you typed, from Cloudflare's network, with a user agent that names this site. That site sees a visit from Cloudflare, not from you.
  • The SSL checker connects to the site the same way and looks up its certificates in the public Certificate Transparency logs at crt.sh.
  • The speed test runs in your browser against Cloudflare's speed servers (speed.cloudflare.com) with Cloudflare's open-source test engine. Cloudflare collects the anonymous test results for its own statistics about internet quality.
  • The subnet calculator and the user-agent decoding run in your browser. (The user-agent page also asks our server which Accept-Language header your browser sent; nothing is stored.)
  • To make repeated checks fast and to protect the services above, an answer may be kept in Cloudflare's cache for between one minute and one hour (one minute for website and email checks, up to an hour for WHOIS, IP and certificate data). The cache is keyed by the thing checked, never by who checked it.
  • Copy link puts what you checked in the link after the # sign. Browsers never send that part to a server, so it doesn't appear in any server log; anyone you give the link to can see it. Try this next links carry it the same way.

"It's down for me" reports

On the Is it down? page you can press Yes, it's down for me. Only the site name, the hour and a running count are stored, in a database on Cloudflare. No IP address, no cookie, no ID. Counts older than 30 days are deleted. To stop the same browser from counting twice, a marker for that site and hour is kept in your browser's local storage.

What your browser stores

  • Your light or dark theme choice, under ndh-theme.
  • The "already reported" markers described above, under ndh-rep-….
  • If you mark guides as read in the Learn section, the list of those guides is kept in your browser's local storage too, so we can show your progress. Use "Reset progress" on the Learn page, or clear your browser data, to delete it.
  • Offline copies for the app: on the live site, a service worker keeps copies of the pages you've opened, so they open without a connection (the checks themselves need the internet). They contain no personal data and are removed when you clear this site's data or uninstall the app.
  • Fonts are served from this site itself, so no font service learns that you visited.
  • No accounts and no sign-up. The site itself sets no cookies.

Usage counts

To see which tools are useful, the site adds up anonymous daily totals: how many checks were run on each tool, how often Copy link, Copy as text and Share were pressed, how many "down for me" reports were sent, and which tool a "Try this next" link was followed from. Only the day, the tool, the page language and the total are stored. Never what you checked, nothing about you, no cookies and no identifiers.

The contact form

The form asks for no name, e-mail address or account. What is stored, in a database on Cloudflare: the message type, your message, the page you picked (optional), your rating (optional), the date, and the country Cloudflare detects from your connection. Your IP address is not stored.

  • If you write in another language, the message is translated into English with Cloudflare Workers AI so it can be read. The original is kept next to the translation.
  • To stop spam, the form uses Cloudflare Turnstile, a security check that runs in your browser and is sent to Cloudflare. It doesn't use your message.
  • Messages are only read by the site owner, never shared or sold, and deleted automatically after 12 months.

Visitor statistics

The site uses Cloudflare Web Analytics to count page views. It sets no cookies, doesn't track you across sites and doesn't identify you.

Advertising

No ads are shown yet. If Google AdSense ads are added later, this section will describe them before they appear, and visitors in the EEA, the UK and Switzerland will be asked for consent first.

Hosting

The site and its server functions run on Cloudflare, which processes basic technical data such as IP addresses to deliver pages and protect against attacks. The site owner doesn't keep request logs.

Your rights

Under the GDPR you can ask what data is held about you, and ask for it to be corrected or deleted. The site holds no lookups and no IP addresses, so there is usually nothing to find. Contact messages carry no name or e-mail: to have one deleted, send a new message through the contact form quoting its date and first words.

Changes

If the site starts handling any other personal data, this page will be updated first and will list exactly what changes.

Results come from public DNS, registry and certificate data and from checks run from Cloudflare's network at the moment you ask. They can differ from what another network sees. How our tools work · Terms of use.