Skip to Content
[CAIDA - Center for Applied Internet Data Analysis logo]
Center for Applied Internet Data Analysis
Supplemental data for "Lost in Space: Improving Inference of IPv4 Address Space Utilization"
The following visualizations are supplements for the paper "Lost in Space: Improving Inference of IPv4 Address Space Utilization".
IPv4 Address Space Utilization:

This visualization shows the utilization of the IPv4 address space according to our inference methodology, which combines data from active and passive measurements. The IPv4 address space is rendered in two dimensions using a space-filling continuous fractal Hilbert curve of order 12. Each pixel in the full-resolution image represents a /24 block (256 contiguous addresses).

Country Inequality (Interactive):

Interactive visualization that compares per-country address space utilization with population and GDP. The width of a country (and continent) represents its relative size within a dataset. E.g., the top bar shows the percentage that each country contributes to the global population, with China (cn) contributing the most (1.36B, 18.9%). The correlation between datasets can be observed by comparing bars. There is not a strong correlation between population (top bar) and number of used /24 blocks of a country; in large part due to high usage by the USA. There is, however, a strong correlation between the GDP (2nd from top) and number of used /24 blocks of a country (3rd bar). Not only does the USA dominate /24 block usage, it also represents a significant portion of both the routed unused and unrouted assigned bars, with 49.8% and 67.5% respectively.

Geographic Maps of Address Space Utilization (Interactive):

Interactive geographical map visualization that allows comparison between four maps derived from our census dataset.

  • Unused Space Ratio: Per-country percentage of unused space (routed unused + unrouted assigned) out of the assigned. The U.S. is red in this map due to a few very large allocations heavily unutilized, while some African countries are red because they use a very small fraction of their (also small) assigned space.
  • # /24s in use: Per-country absolute numbers of /24 blocks in use.
  • Per-country /24 block usage normalized by population: Shows the number of /24 blocks in use per 1M people.
  • Per-country /24 block usage normalized by Gross Domestic Product (GDP): Shows the number of /24 blocks in use per US$1B of GDP.

Population and GDP data was obtained from the CIA Factbook.

Regional Internet Registries (RIRs):

Regional Internet Registries (RIRs) manage the allocation and assignment of internet resources. These two visualizations show 1) RIRs and their corresponding geographical locations, and 2) RIRs within the Hilbert Graph.

  Last Modified: Thu Sep-14-2017 16:51:41 PDT
  Page URL: