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In page Internet censorship in South Korea:

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South Korea has banned at least 65 sites considered sympathetic to North Korea through the use of IP blocking.[1][2] Most North Korean websites are hosted overseas in the United States, Japan and China. Critics say that the only practical way of blocking a webpage is by denying its IP address, and since many of the North Korean sites are hosted on large servers together with hundreds of other sites, the number of real blocked pages increases significantly. Estimates are that over 3,000 additional webpages are rendered inaccessible.[citation needed]