We’ve been taking Internet IPv4 censuses regularly since 2006. In each census, we probe the entire allocated IPv4 address space. You may browse 8 years of data at our IPv4 address browser.
We recently put together an animation showing 8 years of IPv4 censuses, from 2006 through 2014.
These eight years show some interesting events, from an early “open” Internet in 2006, to full allocation of IPv4 by ICANN in 2011, to higher utilization in 2014.
This animation was first shown at the Dec. 2014 DHS Cyber Security Division R&D Showcase and Technical Workshop as part of the talk “Towards Understanding Internet Reliability” given by John Heidemann. This work was supported by DHS, most recently through the LACREND project.