Geographic Distribution of Sites

What does the legend mean? The green dots are for sites for which we have actual country and city data AND an entry in the latitude/longitude database. The blue dots are simlarly for sites with a distinct city listed. The yellow and red dots denote sites with country data, the former having a capitol in the location database, and the latter depending on the data from an IP lookup. The magenta dots are wholly dependent on the IP lookup and may point to an ISP`s HQ instead of the actual site.   country,city   city   capitol   country   ip