What's my DNS number?
Interpreted as: Which DNS server should I use?
When setting up your devices to connect to the Internet it is important that you configure your computer, tablet, phone or gaming device to connect to the correct DNS server. Using the correct DNS server means that you will get the fastest and most reliable lookups for when you're visiting websites and accessing other services online.
While most routers and modems will automatically assign the correct IP address to your device to use as a DNS server there is some cases in which you may need to configure this manually.
whatsmydns.net provides a DNS Server List that contains of many of the major ISP's throughout the world. When possible you should try and use the DNS server that is provided by your service provider in order to have the fastest possible DNS lookups.
It is also possible to use one of the many Global DNS providers such as Google DNS, or Cloudflare as your DNS server. Many of these providers can often be faster and more reliable than even your own Internet Service Providers servers.