This WordPress hosting tutorial will explain how to disable DNS Prefetch in WordPress 4.6.
In WordPress 4.6 the DNS Prefetch was added in the Core functions. This means means that in the web site header you could see links like:
If you want to remove the links just add this code to your Theme Functions (functions.php) file:
// Disable . . . → Read More: How to disable DNS Prefetch in WordPress 4.6