Apex and 'www' Subdomain IP
Confirms that the IP addresses match for the website with and without the www subdomain.
The IP address found for 'example.com' and 'www.example.com' should match because they should point to the same place. If these do not match, this test will report an error.
For very large and popular websites, there may be a valid use-case for these answers to be different to provide some load balancing or redundancy. If this applies to your website, then you probably already know what you are doing and this test can be ignored.