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 What works for me?Telegram, Instagram, YouTube and more on your connection 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.

Link and headers

Follows the redirects one by one so you see where a link really goes, and shows the final site’s headers and security settings.

Domain email

Checks a domain’s mail server, SPF, DMARC, DKIM key, MTA-STS and TLS-RPT policies and BIMI logo together.

Network (ASN)

Who runs a network, the IP ranges it announces and the networks it connects through. Type the network number, like AS44244.

What works for me?

One button connects your device straight to these services to see which open and how fast. Open means the server answered; some services still refuse users in Iran.

Ad blockers may stop some of these requests and make that service look blocked.

Who hosts it?

Which company’s network a site sits on, which country its server is in, whether it uses a CDN, and who runs its DNS and email.

SPF and DMARC builder

Fill in the form to get a correct SPF or DMARC record, then add it in your domain’s DNS panel.

Domain (optional)

SPF record

SPF guide

DMARC record

DMARC guide

CSR maker and certificate converter

Make a certificate signing request (CSR) and private key right here in the browser, and convert certificates between PEM and DER. The key never leaves your device.

Make a certificate request

Convert PEM and DER

PEM text Or a certificate file (PEM or DER)

What are a certificate request and a private key?

An SSL certificate needs a pair of keys: a private key that stays only on your server, and a public key that goes into the certificate. A certificate request hands the public key and the domain names, signed with the private key, to the issuer so it can make your certificate. The private key must never be sent to anyone.

PEM is the certificate turned into text between BEGIN and END lines, and DER is the same data in binary. Most Linux servers want PEM and some Windows and Java systems want DER; the content is the same, only the way it is written differs.