http://magma.ua4vjlx72wv5crhkificaeysp62hizhazipfshsdvs6jxqvhtkpllcad.onion/guide/network-measurements.html
Under certain laws and policies, however, carriers are required to
store data such as assigned IP addresses for specified periods of time,
sometimes many years (although this can be complicated by common techniques such
as Network Address Translation that allows multiple devices to share a single IP
address). In case IP address logs do uniquely identify devices, IP addresses
should be considered key-attributes that render a data subject identifiable. #...