With the same methodology as described in http://moat.nlanr.net/IPaddrocc/, this sumamry describes the changes of the "known routing system" across a 18 month period. Specifically by comparing the routes known at the 27 November 1997, which those at the 27 May 1999.

The address occupancy for the two dates were:

• 27 November 1997:
  • 3,538,970 Class-C equivalent host clusters
  • maximally supporting 905,976,320 hosts
  • utilizing 21.1 percent of the totally available addressing space
• 27 May 1999:
  • 3,752,222 Class-C equivalent host clusters
  • maximally supporting 960,568,832 hosts
  • utilizing 22.4 percent of the totally available addressing space

In other words, the actively used address space increased by roughly 6 percent over the 18 month period, while still staying below a quarter of the available 32 bit address space.

The graphs below graphically depict the situation, using the color blue for the 27 November 1997 situation, and red for 27 May 1999. The color-mixing 18 month result graph shows:

• blue: address space only occupied in November 1997
• red: address space only occupied in May 1999
• purple: address space occupied at both observation times
• white: address space not occupied at either observation times

27 November 1997

27 May 1999

18 month differences