Although the SOPA bill has not yet been adopted, Internet activists have begun to prepare for the worst - blocking certain domains in the United States at the DNS level.
Lists of IP addresses of popular sites are created (the so-called SOPA emergency list for the registration of hosts.txt).

To bypass such a blocking, a
DeSopa extension was developed that simply obtains the IP address of any domain from an alternative independent DNS service that is not subject to US jurisdiction. In the future, the site is loaded directly by IP.
Developers have warned that if SOPA is adopted, hundreds and thousands of such programs will appear for access via alternative channels to the “blocked” content. People will start using the Tor anonymizer network, alternative networks like Darknet, P2P, and traffic cryptographic protection. All this threatens to fragment the Internet, not to mention completely discrediting the DNS system (switching to P2P DNS), and threatens the security of the Network, so ultimately SOPA is a big mistake.
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DeSopa project on githubDeSopa does not recognize subdomains and virtual hosts.