Aspects of the subject technology are related to systems and methods for anticipating content domain names to be used by a browser. A system may be configured to detect network events while one or more web pages associated with a domain name are being loaded, identify, based on the network events, one or more content domain names that are associated with the domain name, and storing, in a data repository, associations of the one or more content domain names with the domain name. The associations of the one or more content domain names in the data repository may be used to initiate a Domain Name System (DNS) request for at least one of the one or more content domain names when a subsequent web page associated with the domain name is loaded by a browser.