What should we check?

Check my device IP, provider, speed and VPN leaks

Check this Type a site, domain, IP or subnet

All tools

GuidesEvery CheckNet check has a guide: what it is, why it matters and how to fix it, step by step.

My device

Your IP …

Checks

Speed testDownload, upload and ping Open port on my IPCan the outside reach your device or router? My IP’s networkNetwork owner and reverse name

More details

This connection

This device

This is what Cloudflare sees of this connection. Nothing is stored.

Same as JSON Just the IP (for curl)

Your request headers

Speed test

Measured to the nearest Cloudflare data centre, with no other service involved. On a fast connection it uses up to about 200 MB of data.

Ping–ms

Download–Mbps

Upload–Mbps

Guide: slow internet, high ping and jitter

Is it blocked?

The site is opened from networks inside the country and from outside it, next to OONI’s figures for the last month.

Does it open everywhere?

We open the site from several countries, so you can see whether it is reachable everywhere.

Port check

Timed from the Cloudflare data centre nearest to you, not from your device. Common ports only.

Ping and route

Ping tells you how far away a host is; traceroute and MTR show the path hop by hop. It runs from places around the world, not from your device.

Ping Traceroute MTR

DNS

Domain records, DNS and email health, and DNS answers from around the world.

Domain info

Registrar, registration and expiry dates and name servers, from RDAP.

SSL certificate

Check a site’s certificate, or read a certificate (PEM).

Have a certificate (PEM)?

Certificate in PEM (a chain is fine)

What does an SSL certificate do?

An SSL certificate (properly called TLS) does two things: it encrypts the connection between you and the site, and it proves the site you reached really is the name in the address bar. A certificate authority signs it, and browsers trust only known authorities.

Every certificate expires; free Let’s Encrypt certificates last 90 days and usually renew themselves. If renewal fails, browsers show a security warning and most visitors leave.