Yostivanich

There are 3,706,650,624 usable IPv4 addresses. On Jan­u­ary 1, 2000, approx­i­mately 1,615 mil­lion (44 per­cent) were in use and 2,092 mil­lion were still avail­able. Today, ten years later, 2,985 mil­lion addresses (81 per­cent) are in use, and 722 mil­lion are still free. In that time, the num­ber of addresses used per year increased from 79 mil­lion in 2000 to 203 mil­lion in 2009. So it’s a near cer­tainty that before Barack Obama vacates the White House, we’ll be out of IPv4 address. (Even if he doesn’t get re-elected.)

via A decade’s worth of IPv4 addresses.