AdAway v3.2 is an ad-blocking hosts file (hosts file) uses. Hosts file contains a list of mapping between hostname and IP address is. When a program, advertisement request, the request is redirected to 127.0.0.1 which does nothing. As well as options to run a web server to respond to requests to address IP hostname blocked and guide to take you there. You can download the app, but it was the hosts file and to add specific sites to the black list is possible.