This is a visual representation of the Internet’s IPv4 address space, as seen by the University of Oregon Route Views project on January 1st, 2019. The map is divided into 16,777,216 pixels, each pixel representing a single /24, or 256 IPv4 addresses. Each contiguous block represents an announcement in the global BGP address table. The address space is presented as a Hilbert curve, a fractal representation ensuring all blocks appear as squares or rectangles. The colors represent the smallest announcement within that pixel, from /8 to /32. Black areas are unannounced, red areas are special blocks defined in RFC 5735 which are not globally routable, and grey is reserved for future use (though is not expected to ever be globally routable, due to historical limitations).
More information: https://vad.solutions/ipmap/
IPv6 poster: https://www.redbubble.com/people/vadco/works/36033041-the-ipv6-internet-january-2019