Subnet Masks and Subnets

Subnet Masks and Subnets:

notation resulting subnet

netmask shorthand number of addresses

255.255.255.0 /24 [8-bit] 2⁸ = 256 = 254 hosts + 1 bcast + 1 net base

255.255.255.128 /25 [7-bit] 2⁷ = 128 = 126 hosts + 1 bcast + 1 net base

255.255.255.192 /26 [6-bit] 2⁶ = 64 = 62 hosts + 1 bcast + 1 net base

255.255.255.224 /27 [5-bit] 2⁵ = 32 = 30 hosts + 1 bcast + 1 net base

255.255.255.240 /28 [4-bit] 2⁴ = 16 = 14 hosts + 1 bcast + 1 net base

255.255.255.248 /29 [3-bit] 2³ = 8 = 6 hosts + 1 bcast + 1 net base

255.255.255.252 /30 [2-bit] 2² = 4 = 2 hosts + 1 bcast + 1 net base

255.255.255.254 /31 [1-bit] 2¹ = – Invalid (no possible hosts)

255.255.255.255 /32 [0-bit] 2⁰ = 1 Host Route

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Subnet Masks and Subnets

Subnet Masks and Subnets

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notation		resulting subnet
netmask	shorthand	number of addresses
255.255.255.0	/24 [8-bit]	2⁸ =	256	= 254 hosts + 1 bcast + 1 net base
255.255.255.128	/25 [7-bit]	2⁷ =	128	= 126 hosts + 1 bcast + 1 net base
255.255.255.192	/26 [6-bit]	2⁶ =	64	= 62 hosts + 1 bcast + 1 net base
255.255.255.224	/27 [5-bit]	2⁵ =	32	= 30 hosts + 1 bcast + 1 net base
255.255.255.240	/28 [4-bit]	2⁴ =	16	= 14 hosts + 1 bcast + 1 net base
255.255.255.248	/29 [3-bit]	2³ =	8	= 6 hosts + 1 bcast + 1 net base
255.255.255.252	/30 [2-bit]	2² =	4	= 2 hosts + 1 bcast + 1 net base
255.255.255.254	/31 [1-bit]	2¹ =	–	Invalid (no possible hosts)
255.255.255.255	/32 [0-bit]	2⁰ =	1	Host Route