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As of April 2013 almost 95% of the IPv4 address space has been allocated. Yet, the transition to IPv6 is still relatively slow. One reason could be existing “IPv4 reserves” - allocated but unused IPv4 addresses. Knowing how many addresses are actively used is important to predict a potential IPv4 address market, predict the IPv6 deployment time frame, and measure progressive exhaustion after the IPv4...
Many people have data sources of used IPv4 addresses, e.g. server logs or network measurements. However, the challenge when estimating IPv4 address usage is to combine the data sources of multiple collaborators in a secure and efficient way. The number of observed addresses in one source is often not sensitive information, but most people do not want to share datasets of unanonymised IPv4 addresses...
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