It’s as old as the internet, but it can still be interesting and it’s still kept up-to-date: IANA’s IPv4 Global Unicast Address Assignements
Want to see every /8 managed by the RIPE? Try:
wget -o /dev/null -O - http://www.iana.org/assignments/ipv4-address-space/ | fgrep whois.ripe.net
This map also shows how many IPv4 /8 addresses blocks are still unallocated.