CIDR Ranges for Everything except RFC1918

Solution 1:

Let me show my working here...

You need a minimal number of CIDR blocks to cover:

• 0.0.0.0-9.255.255.255
• 11.0.0.0-172.15.255.255
• 172.32.0.0-192.167.255.255
• 192.169.0.0-223.255.255.255

To turn these ranges into minimal CIDR blocks, you can just use netmask (the swiss army knife of addressing), like so:

$ netmask -c 0.0.0.0:9.255.255.255
    0.0.0.0/5
    8.0.0.0/7
$ netmask -c 11.0.0.0:172.15.255.255
   11.0.0.0/8
   12.0.0.0/6
   16.0.0.0/4
   32.0.0.0/3
   64.0.0.0/2
  128.0.0.0/3
  160.0.0.0/5
  168.0.0.0/6
  172.0.0.0/12
$ netmask -c 172.32.0.0:192.167.255.255
 172.32.0.0/11
 172.64.0.0/10
172.128.0.0/9
  173.0.0.0/8
  174.0.0.0/7
  176.0.0.0/4
  192.0.0.0/9
192.128.0.0/11
192.160.0.0/13
$ netmask -c 192.169.0.0:223.255.255.255
192.169.0.0/16
192.170.0.0/15
192.172.0.0/14
192.176.0.0/12
192.192.0.0/10
  193.0.0.0/8
  194.0.0.0/7
  196.0.0.0/6
  200.0.0.0/5
  208.0.0.0/4

Hey presto, Bob's your Auntie's live-in lover.

Solution 2:

Bogon space, and non-bogon space CIDR blocks are available in the bogon report:

http://www.cidr-report.org/bogons/

Solution 3:

I have no idea what you're planning on using this for, but here you go:

http://bgp.potaroo.net/as2.0/bgptable.txt

Just a total dump of the BGP routing table.

Solution 4:

Yes. You are looking for the IANA IPv4 Address Space Registry.

The IPv4 Address that are on the Internet are the ones who start of with one of the numbers what are Allocated in that table.