Frequently asked question. Most sites hang counters that work on obscure algorithms.

However, there is quite a reliable method to calculate the desired value. Traditionally, we are not interested in ip-addresses in the US or Asia, because they will still not be available for Europe.

There are special ripe statistics files in an extended format (including both busy and free addresses): albatross.ripe.net/delegated-extended
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Further from this data a simple script easily considers what is needed:

wget ftp://ftp.ripe.net/pub/stats/ripencc/delegated-ripencc-extended-latest -O ripe.txt b=0 for a in `grep avail ripe.txt |grep ipv4|cut -f 5 -d '|'`; do b=$(($b+$a)) done echo $b 

58932064 unallocated ipv4 addresses left

as of 08/08/2011.

For the month from 07/08/2011 to 08/08/2011, 1.6 million addresses were distributed. Simple math linear prediction says that up to state / 8 there are approximately 26 months left. That is, approximately by November 2014. RIPE at the training announced the "end of 2011 and the beginning of 2012". Most likely, they proceeded not from linear consumption, but from an increase in consumption (which was observed earlier and for which there are no assumptions about a decline in the future).