block	netmask	# class c's	# of hosts
/13	255.248.0.0	2048	512,000
/14	255.252.0.0	1024	262,144
/15	255.254.0.0	512	131,072
/16	255.255.0.0	256	65,536
/17	255.255.128.0	128	32,768
/18	255.255.192.0	64	16,384
/19	255.255.224.0	32	8,192
/20	255.255.240.0	16	4,096
/21	255.255.248.0	8	2,048
/22	255.255.252.0	4	1,024
/23	255.255.254.0	2	512
/24	255.255.255.0	1	254
/25	255.255.255.128	1/2	126
/26	255.255.255.192	1/4	62
/27	255.255.255.224	1/8	32
/28	255.255.255.240	1/16	16
/29	255.255.255.248	1/32	8
/30	255.255.255.252	1/64	4
/31	255.255.255.254	1/128	2
/32	255.255.255.255	1/256	1