Allowed Class A-B-C Subnet and Host IP addresses and CIDR

Allowed Class A Subnet and Host IP addresses

# bits	Subnet Mask	CIDR	# Subnets	# Hosts	Nets * Hosts
2	255.192.0.0	/10	2	4194302	8388604
3	255.224.0.0	/11	6	2097150	12582900
4	255.240.0.0	/12	14	1048574	14680036
5	255.248.0.0	/13	30	524286	15728580
6	255.252.0.0	/14	62	262142	16252804
7	255.254.0.0	/15	126	131070	16514820
8	255.255.0.0	/16	254	65534	16645636
9	255.255.128. 0	/17	510	32766	16710660
10	255.255.192. 0	/18	1022	16382	16742404
11	255.255.224. 0	/19	2046	8190	16756740
12	255.255.240. 0	/20	4094	4094	16760836
13	255.255.248. 0	/21	8190	2046	16756740
14	255.255.252. 0	/22	16382	1022	16742404
15	255.255.254. 0	/23	32766	510	16710660
16	255.255.255. 0	/24	65534	254	16645636
17	255.255.255. 128	/25	131070	126	16514820
18	255.255.255. 192	/26	262142	62	16252804
19	255.255.255. 224	/27	524286	30	15728580
20	255.255.255. 240	/28	1048574	14	14680036
21	255.255.255. 248	/29	2097150	6	12582900
22	255.255.255. 252	/30	4194302	2	8388604

Allowed Class B Subnet and Host IP addresses

# bits	Subnet Mask	CIDR	# Subnets	# Hosts	Nets * Hosts
2	255.255.192. 0	/18	2	16382	32764
3	255.255.224. 0	/19	6	8190	49140
4	255.255.240. 0	/20	14	4094	57316
5	255.255.248. 0	/21	30	2046	61380
6	255.255.252. 0	/22	62	1022	63364
7	255.255.254. 0	/23	126	510	64260
8	255.255.255. 0	/24	254	254	64516
9	255.255.255. 128	/25	510	126	64260
10	255.255.255. 192	/26	1022	62	63364
11	255.255.255. 224	/27	2046	30	61380
12	255.255.255. 240	/28	4094	14	57316
13	255.255.255. 248	/29	8190	6	49140
14	255.255.255. 252	/30	16382	2	32764

Allowed Class C Subnet and Host IP addresses

# bits	Subnet Mask	CIDR	# Subnets	# Hosts	Nets * Hosts
2	255.255.255. 192	/26	2	62	124
3	255.255.255. 224	/27	6	30	180
4	255.255.255. 240	/28	14	14	196
5	255.255.255. 248	/29	30	6	180
6	255.255.255. 252	/30	62	2	124