You can find tutorials on how to do that on our Support page.
For macOS: go to Utilities and open the Terminal.
You should get a reply like this (depending of DNS country you have selected it can look slightly different):
If you see in your result at “Address:” (1) an IP address other than “184.108.40.206”, go to step 4 of this tutorial.
If you see the result as “220.127.116.11” then you have no problems using our DNS servers.
You should get as a reply something like this:
If you see in your result at “Address:” (2) an IP address other than “18.104.22.168” then your Internet Service Provider is doing Transparent DNS Proxy.
If the results of this test shows that your ISP is doing transparent DNS proxy, there are two available solutions:
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