DNS-based content routing techniques are described. In one or more implementations, data is examined that describes interactions via a network with content via a domain name. Responsive to the examination, a policy is adjusted to change how one or more network addresses are resolved for the domain name for access to the content. A communication is formed that includes the adjusted policy to be communicated to one or more domain name system (DNS) servers, the adjusted policy configured to specify which network address are resolved for the domain name by the one or more DNS servers for access to the content.