This document discusses subnetting and subnet masks. It shows the binary and decimal representations of numbers from 1 to 32 and the corresponding subnet masks with bits set from left to right. The number of hosts that can be accommodated on each subnet is shown depending on the number of bits set in the subnet mask, with a higher number of bits set allowing for fewer individual host addresses.

1. ©opyright NEO MPONYA
NA = BA + 1
FH = NA + 1
LH = NA + (2n
– 2)
BA = LH + 1
BINARY
DECIMAL
27
26
25
24
23
22
21
20
NO.HOSTS 128 64 32 16 8 4 2 1
SUBNET
MASK
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16
17 18 19 20 21 22 23 24
25 26 27 28 29 30 31 32
SUBNET
MASK
ADDRESS
128 192 224 240 248 252 254 255
B
I
T
S
1 1 1 1 1 1 1 1
0 1 1 1 1 1 1 1
0 0 1 1 1 1 1 1
0 0 0 1 1 1 1 1
0 0 0 0 1 1 1 1
0 0 0 0 0 1 1 1
0 0 0 0 0 0 1 1
0 0 0 0 0 0 0 1
NETWORK
st
1
nd
2
rd
3
th
4