IPv6 CIDR Chart Prefix /24 /25 /26 /27 /28 /29 /30 /31 /32 /33 /34 /35 /36 /37 /38 /39 /40 /41 /42 /43 /44 /45 /46 /47 /48 /49 /50 /51 /52 /53 /54 /55 /56 /57 /58 /59 /60 /61 /62 /63 /64 /48s /56s /64s 16 M 8M 4M 2M 1M 512 K 256 K 128 K 64 K 32 K 16 K 8K 4K 2K 1K 512 256 128 64 32 16 8 4 2 1 4G 2G 1G 512 M 256 M 128 M 64 M 32 M 16 M 8M 4M 2M 1M 512 K 256 K 128 K 64 K 32 K 16 K 8K 4K 2K 1K 512 256 128 64 32 16 8 4 2 1 1T 512 G 256 G 128 G 64 G 32 G 16 G 8G 4G 2G 1G 512 M 256 M 128 M 64 M 32 M 16 M 8M 4M 2M 1M 512 K 256 K 128 K 64 K 32 K 16 K 8K 4K 2K 1K 512 256 128 64 32 16 8 4 2 1 *address ranges 2001:0200:/23 minimum /35 portable allocations, 2001:0C00:/23 minimum /48 portable assignments, 2001:07FA:/32 minimum /64 portable assignments K = 1,024 • M = 1,048,576 • G = 1,073,741,824 • T = 1,099,511,627,776 www.apnic.net
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