In my previous post, I examined the total amount of IPv4 space announced and presented cumulative graphics. While this view is useful in determining how much IPv4 space is announced, it doesn’t say much about which IPv4 space is announced. The graphic in Figure 1 is an alternate visualization of the data from that post and is called the Internet barcode.
Figure 1[view a larger version of Figure 1]
On the left side of the graphic I have listed the 256 /8 CIDR blocks found in IPv4 space. Each /8 has a horizontal line where the darkness of the line corresponds to the amount of that /8 that is announced. As with the previous post, the data covers the time period between January 1, 2009 and December 31, 2012.