Redirect URL without subdomain to your blog’s URL
To redirect your readers from “mydomain.com” to “www.mydomain.com,” set up a naked redirect:
Go to your domain provider’s website.
Open your DNS settings.
Add these 4 A-records that point to Google IPs. If A-records for “mydomain.com” already exist, you should remove the existing A-records.
216.239.32.21
216.239.34.21
216.239.36.21
216.239.38.21