네트워크 IP수 계산표 (Netmask, Bitmask)

 

Netmask	PREFIX (bit mask)	Hosts Count	remark
255.255.255.255	/32	1
255.255.255.254	/31	2
255.255.255.252	/30	4
255.255.255.248	/29	8
255.255.255.240	/28	16
255.255.255.224	/27	32
255.255.255.192	/26	64
255.255.255.128	/25	128
255.255.255.0	/24	256	class C network
255.255.254.0	/23	512
255.255.252.0	/22	1,024
255.255.248.0	/21	2,048
255.255.240.0	/20	4,096
255.255.224.0	/19	8,192
255.255.192.0	/18	16,384
255.255.128.0	/17	32,768
255.255.0.0	/16	65,536	class B network
255.254.0.0	/15	131,072
255.252.0.0	/14	262,144
255.248.0.0	/13	524,288
255.240.0.0	/12	1,048,576
255.224.0.0	/11	2,097,152
255.192.0.0	/10	4,194,304
255.128.0.0	/9	8,388,608
255.0.0.0	/8	16,777,216	class A network
254.0.0.0	/7	33,554,432
252.0.0.0	/6	67,108,864
248.0.0.0	/5	134,217,728
240.0.0.0	/4	268,435,456
224.0.0.0	/3	536,870,912
192.0.0.0	/2	1,073,741,824
128.0.0.0	/1	2,147,483,648
0.0.0.0	/0	4,294,967,296