Loading page
Feature checklists make every tool look equivalent. This table leads with the three things that actually differ — what it costs you before it works, whether your files leave your device, and where the free version stops.
| What's My DNSwhatsmydns.net | ICANN Lookuplookup.icann.org | Down for Everyone or Just Medownforeveryoneorjustme.com | PageSpeed Insightspagespeed.web.dev | |
|---|---|---|---|---|
| What it does | Checks a DNS record from dozens of resolvers around the world at once | The registry's own WHOIS record for a domain, with no upsell | Settles whether a site is actually down or only down for you | Scores a page on real-user Core Web Vitals and lab measurements |
| What it costs you | No sign-upWorks the moment the page loads. No account, no email, no trial. | No sign-upWorks the moment the page loads. No account, no email, no trial. | No sign-upWorks the moment the page loads. No account, no email, no trial. | No sign-upWorks the moment the page loads. No account, no email, no trial. |
| Your files | Runs on their server | Runs on their server | Runs on their server | Runs on their server |
| Where it stops | Only sees public resolver caches — internal or split-horizon DNS is invisible to it. | Registrant names and emails are redacted for most domains, and some country registries are not covered. | One check from one location — it misses regional outages and says nothing about why a site is down. | Field data is missing for low-traffic pages, and repeat lab runs vary by several points on unchanged code. |
| Best for |
|
|
|
|
| Category | Web, Domain & Network | Web, Domain & Network | Web, Domain & Network | Web, Domain & Network |
| Last checked | 2026-07-29 | 2026-07-29 | 2026-07-29 | 2026-07-29 |
| Open the site | Open | Open | Open | Open |
This comparison is in the address bar — copy the URL to send it to someone.