Subnetting ~ Reference Tables

Conversion Table for Class A Networks
Number of Subnets			Hosts / Subnet	Hosts / Subnet	No of bits	Subnet Mask	Bit Setting	Subnet Start value
0	= (2^1 – 2)		8,388,606	(2^23 – 2)	1	255.128.0.0	10000000	128
2	= (2^2 – 2)		4,194,302	(2^22 – 2)	2	255.192.0.0	11000000	64
6	= (2^3 – 2)		2,097,150	(2^21 – 2)	3	255.224.0.0	11100000	32
14	= (2^4 – 2)		1,048,574	(2^20 – 2)	4	255.240.0.0	11110000	16
30	= (2^5 – 2)		524,286	(2^19 – 2)	5	255.248.0.0	11111000	8
62	= (2^6 – 2)		262,142	(2^18 – 2)	6	255.252.0.0	11111100	4
126	= (2^7 – 2)		131,070	(2^17 – 2)	7	255.254.0.0	11111110	2
254	= (2^8 – 2)		65,534	(2^16 – 2)	8	255.255.0.0	11111111	1
Conversion Table for Class B Networks
Number of Subnets			Hosts / Subnet	Hosts / Subnet	No of bits	Subnet Mask	Bit Setting	Subnet Start value
0		= (2^1 – 2)	32,766	(2^15 – 2)	1	255.255.128.0	10000000	128
2		= (2^2 – 2)	16,382	(2^14 – 2)	2	255.255.192.0	11000000	64
6		= (2^3 – 2)	8,190	(2^13 – 2)	3	255.255.224.0	11100000	32
14		= (2^4 – 2)	4,094	(2^12 – 2)	4	255.255.240.0	11110000	16
30		= (2^5 – 2)	2,046	(2^11 – 2)	5	255.255.248.0	11111000	8
62		= (2^6 – 2)	1.022	(2^10 – 2)	6	255.255.252.0	11111100	4
126		= (2^7 – 2)	510	(2^9 – 2)	7	255.255.254.0	11111110	2
254		= (2^8 – 2)	254	(2^8 – 2)	8	255.255.255.0	11111111	1
Conversion Table for Class C Networks
Number of Subnets			Hosts / Subnet	Hosts / Subnet	No of bits	Subnet Mask	Bit Setting	Subnet Start value
0		= (2^1 – 2)	126	(2^7 – 2)	1	255.255.255.128	10000000	128
2		= (2^2 – 2)	62	(2^6 – 2)	2	255.255.255.192	11000000	64
6		= (2^3 – 2)	30	(2^5 – 2)	3	255.255.255.224	11100000	32
14		= (2^4 – 2)	14	(2^4 – 2)	4	255.255.255.240	11110000	16
30		= (2^5 – 2)	6	(2^3 – 2)	5	255.255.255.248	11111000	8
62		= (2^6 – 2)	2	(2^2 – 2)	6	255.255.255.252	11111100	4
126		= (2^7 – 2)	0	(2^1 – 2)	7	255.255.255.254	11111110	2
254		= (2^8 – 2)	0	(2^0 – 2)	8	255.255.255.255	11111111	1