The Austrian telecoms regulator, TKK, recently decided that internet service providers are not allowed to block copyright-infringing websites based on their IP addresses. The regulator upheld its practice to allow blocking based on the domain name system (DNS).
According to TKK, DNS blocking is typically sufficient whereas IP blocking has a high risk of blocking unrelated legitimate content (overblocking).
The regulator analyses such cases under the EU net neutrality rules that safeguard open internet access (article 3 of the Telecoms Single Market Regulation).
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