This "CIDR" page provides information about the distribution of address blocks using prefixes and the Classless Inter-Domain Routing (CIDR) protocol, as seen from BGP and MBGP routing announcements seen at AS 16517.
A file containing the BGP histograms is available here.
A file containing the MBGP histograms is available here.
Figure 1 : Histogram of the Number of Prefixes Announced versus the Length of the Prefix.
Figure 2 : Histogram of the Number of Addresses Announced versus the Length of the Prefix.
Figure 3 : Histogram of the Number of CIDR Holes versus the Prefix Length of the Hole.
Figures 1 and 2 show histograms of the numbers of Prefixes and Unique Addresses
announced to AS 16517 (AmericaFree.TV) versus the Length of the
Prefix, expressed in Classless Interdomain Internet Routing (CIDR) terminology.
(Remember than the longer the prefix, the shorter the address block, all the way to a /32,
which is a single address.) Classful address blocks have been converted to their equivalent
CIDR length.
Figure 3 shows the number of holes in CIDR address blocks, as a function of the Prefix length
of the hole. (A hole in a CIDR block is when a smaller prefix is announced from the middle of
a larger one.)
Figure 3 shows the number of holes in CIDR address blocks, as a function of the Prefix length of the hole. (A hole in a CIDR block is when a smaller prefix is announced from the middle of a larger one.)
Figure 4 : Number of Holes in the Multicast (MBGP) CIDR address announcements
For the data used to make this plot, click
here.
Figure 5 : Number of Holes in the Unicast (BGP) CIDR address announcements
For the data used to make this plot, click
here.
Figures 4 and 5 show the number of "holes" in the CIDR prefix announcements for
multicast and unicast address space, respectively. Again, a
hole in a CIDR block is when a smaller prefix is announced from the middle of
a larger one. The number of holes is an indicator of the efficiency of the
CIDR routing process.
