Subnet Mask Sheet

Networkmask	Reverse Networkmask	/CIDR	Usable	Size
0.0.0.0	255.255.255.255	/0	4.294.967.294	:-O
128.0.0.0	127.255.255.255	/1	2.147.483.646	128 Class ‘A’s
192.0.0.0	63.255.255.255	/2	1.073.741.822	64 Class ‘A’s
224.0.0.0	31.255.255.255	/3	536.870.910	32 Class ‘A’s
240.0.0.0	15.255.255.255	/4	268.435.454	16 Class ‘A’s
248.0.0.0	7.255.255.255	/5	134.217.726	8 Class ‘A’s
252.0.0.0	3.255.255.255	/6	67.108.862	4 Class ‘A’s
254.0.0.0	1.255.255.255	/7	33.554.430	2 Class ‘A’s
255.0.0.0	0.255.255.255	/8	16.777.214	1 Class ‘A’
255.128.0.0	0.127.255.255	/9	8.388.606	128 Class ‘B’s
255.192.0.0	0.63.255.255	/10	4.194.302	64 Class ‘B’s
255.224.0.0	0.31.255.255	/11	2.097.150	32 Class ‘B’s
255.240.0.0	0.15.255.255	/12	1.048.574	16 Class ‘B’s
255.248.0.0	0.7.255.255	/13	524.286	8 Class ‘B’s
255.252.0.0	0.3.255.255	/14	262.142	4 Class ‘B’s
255.254.0.0	0.1.255.255	/15	131.070	2 Class ‘B’s
255.255.0.0	0.0.255.255	/16	65.534	1 Class ‘B’
255.255.128.0	0.0.127.255	/17	32.766	128 Class ‘C’s
255.255.192.0	0.0.63.255	/18	16.382	64 Class ‘C’s
255.255.224.0	0.0.31.255	/19	8.190	32 Class ‘C’s
255.255.240.0	0.0.15.255	/20	4.094	16 Class ‘C’s
255.255.248.0	0.0.7.255	/21	2.046	8 Class ‘C’s
255.255.252.0	0.0.3.255	/22	1.022	4 Class ‘C’s
255.255.254.0	0.0.1.255	/23	510	2 Class ‘C’s
255.255.255.0	0.0.0.255	/24	254	1 Class ‘C’
255.255.255.128	0.0.0.127	/25	126	128 Hosts
255.255.255.192	0.0.0.63	/26	62	64 Hosts
255.255.255.224	0.0.0.31	/27	30	32 Hosts
255.255.255.240	0.0.0.15	/28	14	16 Hosts
255.255.255.248	0.0.0.7	/29	6	8 Hosts
255.255.255.252	0.0.0.3	/30	2	4 Hosts
255.255.255.255	0.0.0.0	/32	1	1 Host
255.255.255.254	0.0.0.1	/31	0	2 Hosts

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