Interpreted as: How do I perform a DNS check?
When you make changes to your domain name's DNS settings, by either registering a new domain name and performing the initial setup or by making changes to existing DNS settings it is useful to be able to perform a DNS Check to make sure that your domain name changes have propagated around the world.
whatsmydns.net provides an easy to use interface that allows you to do this DNS check, all you need to do is enter your domain name and choose your record type and a DNS check will instantly be performed which will show you the current state of DNS propagation around the world for your domain name.
The DNS check tool lets you choose from a variety of record types including
A for IP address lookups,
CNAME for canonical or alias records,
MX for Mail Exchanger records as well as many more.