Russian Web search firm Yandex launched a public DNS (Domain Name System) resolution service on Thursday. The service leverages the company’s existing website scanning technology to block access to malicious and adult-rated sites. The DNS acts like a phone book for Internet domain names before accessing any website’s IP address. Users can manually configure their computers, wireless access points, routers or mobile devices to use the service. The company is working with home router manufacturers to create customized firmware that have a built-in option to use it.”]