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In computer networking, DHCP churn or IP churn is the rate at which hosts in a network change IP addresses using Dynamic Host Configuration Protocol (DHCP). IP churn is studied in the literature because it is a source of noise in internet measurement tasks, as it makes more difficult to estimate the unique number of users or devices connected to a network that visited a web page. Churn rates vary among different Internet service provider (ISP) networks, and especially in different countries.