N a m e B r a n d H a n d l e . N e t

IPv4 Subnet and Access-List Cheatsheet

	Host Bits	IPs	Netmask	Inverse Mask	Part of Class C
/32	0	1	255.255.255.255	0.0.0.0	1/256
/31	1	2	255.255.255.254	0.0.0.1	1/128
/30	2	4	255.255.255.252	0.0.0.3	1/64
/29	3	8	255.255.255.248	0.0.0.7	1/32
/28	4	16	255.255.255.240	0.0.0.15	1/16
/27	5	32	255.255.255.224	0.0.0.31	1/8
/26	6	64	255.255.255.192	0.0.0.63	1/4
/25	7	128	255.255.255.128	0.0.0.127	1/2
/24	8	256	255.255.255.0	0.0.0.255	1

	Host Bits	IPs	Netmask	Inverse Mask	Class C Ranges
/23	9	512	255.255.254.0	0.0.1.255	2
/22	10	1,024	255.255.252.0	0.0.3.255	4
/21	11	2,048	255.255.248.0	0.0.7.255	8
/20	12	4,096	255.255.240.0	0.0.15.255	16
/19	13	8,192	255.255.224.0	0.0.31.255	32
/18	14	16,384	255.255.192.0	0.0.63.255	64
/17	15	32,768	255.255.128.0	0.0.127.255	128
/16	16	65,536	255.255.0.0	0.0.255.255	256

	Host Bits	IPs	Netmask	Inverse Mask	Class C Ranges	Class B Ranges
/15	17	131,072	255.254.0.0	0.1.255.255	512	2
/14	18	262,144	255.252.0.0	0.3.255.255	1,024	4
/13	19	524,288	255.248.0.0	0.7.255.255	2,048	8
/12	20	1,048,576	255.240.0.0	0.15.255.255	4,096	16
/11	21	2,097,152	255.224.0.0	0.31.255.255	8,192	32
/10	22	4,194,304	255.192.0.0	0.63.255.255	16,384	64
/9	23	8,388,608	255.128.0.0	0.127.255.255	32,768	128
/8	24	16,777,216	255.0.0.0	0.255.255.255	65,536	256

	Host Bits	IPs	Netmask	Inverse Mask	Class C Ranges	Class B Ranges	Class A Ranges
/7	25	33,554,432	254.0.0.0	1.255.255.255	131,072	512	2
/6	26	67,108,864	252.0.0.0	3.255.255.255	262,144	1,024	4
/5	27	134,217,728	248.0.0.0	7.255.255.255	524,288	2,048	8
/4	28	268,435,456	240.0.0.0	15.255.255.255	1,048,576	4,096	16
/3	29	536,870,912	224.0.0.0	31.255.255.255	2,097,152	8,192	32
/2	30	1,073,741,824	192.0.0.0	63.255.255.255	4,194,304	16,384	64
/1	31	2,147,483,648	128.0.0.0	127.255.255.255	8,388,608	32,768	128
/0	32	4,294,967,296	0.0.0.0	255.255.255.255	16,777,216	65,536	256