Hostsblock is a bash script for Linux designed to take advantage of the HOSTS file available in all operating systems to provide system-wide blocking of internet advertisements, malicious domains, trackers, and other undesirable content. To do so, it downloads a configurable set of blocklists and processes and their entries into a singular HOSTS file.

Hostsblock also includes hostsblock-urlcheck, a command-line utility that allows you to block and unblock certain websites and any other domains contained in that website, in the event that the included blocklists don't block enough or block too little on a specific site.