Amount of announced IPv4-space by ASN not announcing IPv6?

[Emile Aben]

Hi Martin,

On 11/07/2013 10:15, Martin Millnert wrote:
> Dear friends of integers,
> 
> http://bgp.potaroo.net/v6/v6rpt.html appeared in an discussion on an IRC
> channel recently, and it occurred to me that a crucial bit of
> information is not available, namely "What is the total amount of IPv4
> address space announced by ASNs which do (not) also announce IPv6?" (or
> variants of).

For 1 Aug 2013 I found that about 70% of IPv4 address space is announced
by ASNs which also announce IPv6 address space.
Short RIPE Labs article about it:
https://labs.ripe.net/Members/emileaben/ipv6-asns-size-matters

regards,
Emile Aben
RIPE NCC

PS: apologies for late reply, it's vacation time :)