Hilbert map of the 420 Million IP addresses that responded to ICMP ping requests at least two times between June and October 2012. The IP space is mapped to a 2-dimensional Hilbert Curve as inspired by xkcd . For a zoomable, clickable version of this image as well as other data projected in a Hilbert curve take a look the Hilbert Browser 5120x4096 8 MB full size image