We use the registry assignments provided by the registrars. However discrepancies creep in especially in cases of large multinational companies who have their base of operation on one country and satellite offices in other countries. Typically what happens is that a company based in say, the United States, also has a branch in Africa or Asia.In many cases, when the company is assigned a new block of IP addresses these will reflect the correct country (Africa or Asia for example). However, sometimes the location of the parent company is used - USA for example. This leads to an anomaly, where looking up the IP you know to be in one country appears to be somewhere else. This is especially true of companies like AOL, Verizon, Sprint, Telefonica and others who do not operate only in one country. We have found IPs for both AOL and Verizon for example which are outside the US but show as originating in the US which is obviously not correct.Although this only represents a tiny fraction of a percent, this is something that should be kept in mind.
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