Common Subnet Masks

	Addresses	Hosts	Netmask	Reverse Wildcard	Amount of Class C
/30	4	2	255.255.255.252	0.0.0.3	1/64
/29	8	6	255.255.255.248	0.0.0.7	1/32
/28	16	14	255.255.255.240	0.0.0.15	1/16
/27	32	30	255.255.255.224	0.0.0.31	1/8
/26	64	62	255.255.255.192	0.0.0.63	1/4
/25	128	126	255.255.255.128	0.0.0.127	1/2
/24	256	254	255.255.255.0	0.0.0.255	1
/23	512	510	255.255.254.0	0.0.0.255	2
/22	1024	1022	255.255.252.0	0.0.1.255	4
/21	2048	2046	255.255.248.0	0.0.3.255	8
/20	4096	4094	255.255.240.0	0.0.7.255	16
/19	8192	8190	255.255.224.0	0.0.15.255	32
/18	16384	16382	255.255.192.0	0.0.32.255	64
/17	32768	32766	255.255.128.0	0.0.127.255	128
/16	65536	65534	255.255.0.0	0.0.255.255	256