IPv4 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
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.
Solution 4
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.
Related videos on Youtube
YwH
"All right, guys, uh, listen. This is a blues riff in "B", watch me for the changes, and try and keep up?"
Updated on September 18, 2022Comments
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YwH over 1 year
I'm looking for a list of CIDR blocks for "The Internet", i.e. everything from 0.0.0.0 to 223.255.255.255, excluding RFC1918 address space of 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 (yes, I know there are lots of little nets in there that are special, like 192.0.0.0/24, but I really don't care about them). I figure this list must exist somewhere on the Internet, but my google-fu is failing me, so I figured I'd ask here before generating the range myself.
Edit: I forgot a really important part of this question: I need it in the fewest possible number of entries.
And if you want to know what I'm doing with this, we are entering static flow-mods to work around some nasty issues in an OpenFlow controlled network that currently has a significant amount of badness happening, and we need to reduce the number of flow entries temporarily so we don't exceed the available space in the flow tables and cause everything to come crashing down for a few minutes while it reestablishes a connection to the controller.
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YwH over 12 yearsMan, I wish I could give you more than a single plus one. I'll tell all my friends to plus one it.
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womble over 12 yearsI aim to please.
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wfaulk over 9 yearsSource code home for "netmask" seems to be here: trap.mtview.ca.us/~talby/netmask_2.4.tar.gz
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user2689877 about 9 years@womble . the cidrs you have calculated using netmask are the only ones that can be allocated by internet registries?
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Aron over 7 yearsYou sir deserve a cider.