check-host.su now speaks 40 languages and has a dark theme
The whole site, including tool guides and legal pages, is now available in 40 languages. A dark theme follows your system settings and can be switched in the header.
News
Updates, new features and guides.
How to read traceroute and MTR results
What hops, loss and response times mean in traceroute and MTR, why loss on a middle hop is often not a problem, and how to find where packets really get lost.
How to check if a website is down for everyone or just for you
A website does not open — is it down for everyone or only for you? A step-by-step check with HTTP, ping, DNS and traceroute from 25 locations around the world.
Network checks from 25 locations around the world
Ping, HTTP, TCP port, DNS, traceroute and MTR checks now run from 25 locations in 23 countries at once, and every result shows the city it came from.
check-host.su is live
We have launched check-host.su — free online tools to check IP geolocation, availability of websites and ports, DNS records and network routes from different locations around the world.