CIDR FAQ

Thu Aug 17 06:14:41 UTC 1995

I write:
> 
> Which somewhat explains why this group reminds me of a bunch of decapitated
> hens. 
> 
> Would it be correct to interpret your last sentence as:
> 
> 	  We don't what the underlying cause of the growth in prefixes
>           is (new allocations, old allocations, ISP's not aggregating).
> 
> With other words, we don't even know if the I-D in question is fixing the 
> right problem.
[the CC list is getting very long, I've tried to trim it a bit]

Just to provide some hard (haha) data I wipped up a perl script and
dumped a full routing table from one of our routers. Daniel Karrenberg
has produced similar numbers before if I remember correctly. In any
case this allows a large amount of finger pointing (located in Europe
I particulary happy with the performance of 193/24), in particular 
visual inspection of 199/24 would seem to indicate a -lot- of aggregation
potential.

Format  /24 prefix    #of prefixes   %of total address space announced

All usual disclaimers apply (I've not done more than a couple of
sanity checks on the data).

  6     1 100
  9     2  00
 12     1 100
 13     1 100
 16     1 100
 17     1 100
 18     1 100
 20     1 100
 26     1 100
 32     1 100
 33     1 100
 34     1 100
 35     1 100
 36     1 100
 38     1 100
 39    25  00
 40     1 100
 44     1 100
 45     1 100
 46     1 100
 50     1 100
 57     1 100
128   175  68
129   180  70
130   147  57
131   129  80
132    90  70
133   153  59
134   215  75
135    11  04
136    56  25
137   159  66
138   117  57
139   100  39
140   148  57
141   168  81
142   121 100
143   111  45
144   118  46
145    15  05
146   125  48
147   149  60
148   100  40
149   151  58
150   148  59
151    65  23
152    84  49
153    56  24
154     3  01
155   123  53
156    58  22
157   125  49
158   136  61
159   118  45
160   106  47
161   109  42
162    64  25
163   106  41
164   104  41
165   124  50
166    71  24
167    90  46
168   121  47
169    26  13
170    72  28
171     5  26
192  6743  25
193  1953 100
194  1298  28
195     1 100
196   280  04
197     1  00
198  4109  55
199  3372  54
200   273  09
202  1243  19
203   580  33
204  3013  69
205  1217  33
206   329  19
208     3  00

Simon