Classificação de máscara de Subrede

CIDR	Máscara de subrede	Máscara de subrede Reversa	IP	Classe B	Classe C	Classe A
/32	255.255.255.255	0.0.0.0	1
/31	255.255.255.254	0.0.0.1	2
/30	255.255.255.252	0.0.0.3	4
/29	255.255.255.248	0.0.0.7	8
/28	255.255.255.240	0.0.0.15	16
/27	255.255.255.224	0.0.0.31	32
/26	255.255.255.192	0.0.0.63	64
/25	255.255.255.128	0.0.0.127	128
/24	255.255.255.0	0.0.0.255	256	1
/23	255.255.254.0	0.0.1.255	512	2
/22	255.255.252.0	0.0.3.255	1.024	4
/21	255.255.248.0	0.0.7.255	2.048	8
/20	255.255.240.0	0.0.15.255	4.096	16
/19	255.255.224.0	0.0.31.255	8.192	32
/18	255.255.192.0	0.0.63.255	16.384	64
/17	255.255.128.0	0.0.127.255	32.768	128
/16	255.255.0.0	0.0.255.255	65.536	256	1
/15	255.254.0.0	0.1.255.255	131.072	512	2
/14	255.252.0.0	0.3.255.255	262.144	1.024	4
/13	255.248.0.0	0.7.255.255	524.288	2.048	8
/12	255.240.0.0	0.15.255.255	1.048.576	4.096	16
/11	255.224.0.0	0.31.255.255	2.097.152	8.192	32
/10	255.192.0.0	0.63.255.255	4.194.304	16.384	64
/9	255.128.0.0	0.127.255.255	8.388.608	32.768	128
/8	255.0.0.0	0.255.255.255	16.777.216	65.536	256	1
/7	254.0.0.0	1.255.255.255	33.554.432	131.072	512	2
/6	252.0.0.0	3.255.255.255	67.108.864	262.144	1.024	4
/5	248.0.0.0	7.255.255.255	134.217.728	524.288	2.048	8
/4	240.0.0.0	15.255.255.255	268.435.456	1.048.576	4.096	16
/3	224.0.0.0	31.255.255.255	536.870.912	2.097.152	8.192	32
/2	192.0.0.0	63.255.255.255	1.073.741.824	4.194.304	16.384	64
/1	128.0.0.0	127.255.255.255	2.147.483.648	8.388.608	32.768	128
/0	0.0.0.0	255.255.255.255	4.294.967.296	16.777.216	65.536	256

Classificação de Máscara de Sub-Rede