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SAC056 - ICANN SSAC Advisory on Impacts of Content Blocking via the Domain Name System

Warren Kumari
Alain Aina
Jaap Akkerhuis
Don Blumenthal
KC Claffy
David Conrad
Patrik Fältström
James Galvin
Jason Livingood
Danny McPherson
Ram Mohan
Paul Vixie
ICANN Security and Stability Advisory Committee (SSAC) Reports and Advisories, ICANN (Internet Corporation for Assigned Names and Numbers) (2012)


The use of Domain Name System (DNS) blocking to limit access to resources on the Internet has become a topic of interest in numerousInternet governance venues. Several governments around the world, whether by law, treaty, court order, law enforcement action, or other actions or agreements, have either implemented DNS blocking or are actively considering doing so. However, due to the Internet’s architecture, blocking by domain name can be easily bypassed by end users and is thus likely to be largely ineffective in the long term and fraught with unanticipated consequences in the near term. In addition, DNS blocking can present conflicts with the adoption of DNS Security Extensions(DNSSEC) and could promote balkanization of the Internet into a country-by-country view of the Internet’s name space.