CCNA  Subnetting
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CIDR: /30
 is a 255.255.255.252 mask with a block size of 4
 4 hosts (2 usable)
 6 bits on, 2 bits off
 64 subnetworks

CIDR: /29
 is a 255.255.255.248 mask with a block size of 8
 8 hosts (6 usable)
 5 bits on, 3 bits off
 32 subnetworks

CIDR: /28
 is a 255.255.255.240 mask with a block size of 16
 16 hosts (14 usable)
 4 bits on, 4 bits off
 16 subnetworks

CIDR: /27
 is a 255.255.255.224 mask with a block size of 32
 32 hosts (30 usable)
 3 bits on, 5 bits off
 8 subnetworks

CIDR: /26
 is a 255.255.255.192 mask with a block size of 64
 64 hosts (62 usable)
 2 bits on, 6 bits off
 4 subnetworks

CIDR: /25
 is a 255.255.255.128 mask with a block size of 128
 128 hosts (126 usable)
 1 bit on, 7 bits off
 2 subnetworks

CIDR: /24
 is a 255.255.255.0 mask with a block size of 1
 256 hosts (254 usable)
 8 bits on, 0 bits off
 256 subnetworks

CIDR: /23
 is a 255.255.254.0 mask with a block size of 2
 512 hosts (510 usable)
 7 bits on, 9 bits off
 128 subnetworks

CIDR: /22
 is a 255.255.252.0 mask with a block size of 4
 1024 hosts (1022 usable)
 6 bits on, 2 bits off
 64 subnetworks

CIDR: /21
 is a 255.255.248.0 mask with a block size of 8
 2048 hosts (2046 usable)
 5 bits on, 3 bits off
 32 subnetworks

CIDR: /20
 is a 255.255.240.0 mask with a block size of 16
 4096 hosts (4094 usable)
 4 bits on, 4 bits off
 16 subnetworks

CIDR: /19
 is a 255.255.224.0 mask with a block size of 32
 8192 hosts (8190 usable)
 3 bits on, 5 bits off
 8 subnetworks

CIDR: /18
 is a 255.255.192.0 mask with a block size of 64
 16384 hosts (16382 usable)
 2 bits on, 6 bits off
 4 subnetworks

CIDR: /17
 is a 255.255.128.0 mask with a block size of 128
 32768 hosts (32766 usable)
 1 bit on, 7 bits off
 2 subnetworks

CIDR: /16
 is a 255.255.0.0 mask with a block size of 1
 65536 hosts (65534 usable)
 8 bits on, 0 bits off
 256 subnetworks

CIDR: /15
 is a 255.254.0.0 mask with a block size of 2
 131072 hosts (131070 usable)
 7 bits on, 1 bit off
 128 subnetworks

CIDR: /14
 is a 255.252.0.0 mask with a block size of 4
 262144 hosts (262142 usable)
 6 bits on, 2 bits off
 64 subnetworks

CIDR: /13
 is a 255.248.0.0 mask with a block size of 8
 524288 hosts (524286 usable)
 5 bits on, 3 bits off
 32 subnetworks

CIDR: /12
 is a 255.240.0.0 mask with a block size of 16
 1048576 hosts (1048574 usable)
 4 bits on, 4 bits off
 16 subnetworks

CIDR: /11
 is a 255.224.0.0 mask with a block size of 32
 2097152 hosts (2097150 usable)
 3 bits on, 5 bits off
 8 subnetworks

CIDR: /10
 is a 255.192.0.0 mask with a block size of 64
 4194304 hosts (4194302 usable)
 2 bits on, 6 bits off
 4 subnetworks

CIDR: /9
 is a 255.128.0.0 mask with a block size of 128
 8,388,608 hosts (8,388,606 usable)
 1 bit on, 7 bits off
 2 subnetworks

CIDR: /8
 is a 255.0.0.0 mask with a block size of 1
 16,777,216 hosts (16,777,214 usable)
 8 bits on, 0 bits off
 2 subnetworks