Hi, The IANA IPv4 registry has been updated to reflect the allocation of five /8 IPv4 blocks: one to each RIR, in February 2011. You can find the updated IANA IPv4 registry at: http://www.iana.org/assignments/ipv4-address-space/ipv4-address-space.xml http://www.iana.org/assignments/ipv4-address-space/ipv4-address-space.xhtml http://www.iana.org/assignments/ipv4-address-space/ipv4-address-space.txt Please update your filters as appropriate. There are no more unallocated unicast IPv4 /8s in the IANA IPv4 Address Space Registry. Kind regards, Leo Vegoda Number Resources Manager, IANA ICANN