DNS software and service providers will remove accommodations for non-compliant DNS implementations from their software or services, on this date. This change will affect only sites operating non-compliant software. The improvement is designed to make DNS operations slightly efficient, and also allow operators to deploy new functionality.
How to prepare for the changes?
Please validate your Domain Name to ensure your website is not affected by the DNS Flag Day. We recommend that you test whether your domains are compliant and remain accessible by 1st February 2019.
To know more please go to https://dnsflagday.net
The sample of results: