In the near future, ARIN will begin making allocations from the 64/8 block. This will include allocations of /20 and shorter prefixes, according to ARIN's minimum allocation policy. For informational purposes, ARIN currently administers the following blocks: 24/8 (portions of) 63/8 64/8 196/8 198/8 199/8 200/8 204/8 205/8 206/8 207/8 208/8 209/8 216/8 Regards, American Registry for Internet Numbers