Abstract: In the near term there will be no available, unallocated IPv4 addresses. From original estimates of IPv4 exhaustion in 2037, the most widely-cited current estimates for ARIN IPv4 address depletion is now at 2013. This deadline gives a particular importance to IPv6 adoption. The goals of this work were to identify valid measures of IPv6 diffusion and use classic diffusion models to bound the uncertainty in those measures.