Google Webmaster Tools added site “verification by DNS record” feature that allows you to become a verified owner of an entire domain (and all of the sites within that domain) at once. It also provides an alternative way to verify for folks who struggle with the existing HTML file or meta tag methods. “First add example.com to your account, either in Webmaster Tools or directly on Verification Home page. On verification page, select "Add a DNS record" verification method, and follow instructions to add specified TXT record to your domain's DNS configuration. Clicking "Verify," Google’ll check for TXT record, and if it's present, you'll be a verified owner of example.com and any associated websites and subdomains. If you try DNS record verification and it doesn't work right away, don't despair! Sometimes DNS records take a while to make their way across the Internet.