Subnet Shorthand

• 172.17.20.0

• 255.255.0.0

• 1111 1111.1111 1111.0000 0000.0000 0000

• 1

• 2

• 3

• 4

• 5

• 6

• 7

• 8

• 9

• 10

• 11

• 12

• 14

• 15

• 16

• 13

• 18

• 19

• 20

• 17

• 22

• 23

• 24

• 21

• 26

• 27

• 28

• 25

• 30

• 31

• 32

• 29

• 172.17.20.0 /16

• Let's say we have this IP

• And we have this subnet Mask

• If we look at the Subnet Mask in Binary and count the bits we get ..

• The shorthand allows us to use the bit number to represent the mask