The IPv4 address space will be depleted in a few short years. In fact, at the highest levels of the Internet addressing authorities, the last blocks of IPv4 addresses were allocated the five RIR's in February 2011. How soon this depletion affects users network depends on a number of factors, including how much unused IPv4 address space user currently hold and how many addresses are required to sustain user network's annual growth. Broadband network providers are likely to begin feeling the pinch as soon as 2012, while some enterprise network operators may or may not feel a direct impact for many years. At the same time, IPv6 is still in the very early stages of deployment.