IP Addressing
& Subnetting!!!
Look at me!!!
Know me!!!
Memorize me!!!
126
16,777,
214
16,384
65,534
2,097,152
254
Let’s Play!!
IP Address:
Class:
Binary Equivalent:
Subnet Mask:
192.168.1.10
Let’s Play!!
IP Address:
192.168.1.10 /24
Class:
C
Binary Equivalent:
11000000.10101000.00000001.00001010
Subnet Mask:
255.255.255.0
Practice-Binary:
 Translate these addresses into binary:
 213.45.37.123
 192.167.24.64
 17.32.193.250
 What classes do they belong to?
Practice- Binary:
 Translate these addresses into binary:
 213.45.37.123:
 11010101.00101101.00100101.01111011
 192.167.24.64:
 11000000.10100111.00011000.01000000
 17.32.193.250:
 00010001.00100000.11000001.11111010
 What classes do they belong to?
 C, C, A
Magic Number:
 In binary, which bit of the subnet mask (left to right)
switches from 1’s to 0’s?
 Ex: /24: 255.255.255.0
 11111111.11111111.11111111.00000000
 Now you try:
 /28
Magic Number:
 Now you try:
 /28
 255.255.255.240
 11111111.11111111.11111111.11110000
Magic Number:
 Why is this important?
 /28
 255.255.255.240
 11111111.11111111.11111111.11110000
 Subtract the value of that octet from 256.
 11110000=240
 256-240= 16
 Calculate the multiples of your magic number (16) from 0 up to 256
 0
 16
 32
 48
 64…etc
Find the multiple of the magic number that is closest to but no
greater than the IP address’s interesting octet value
 0
 160
 16
 176
 32
 192
 48
 208
 64
 224
 80
 240
 96
 112
 128
 144
 *interesting octet is the
octet in which the 1’s
change to 0’s
Find the multiple of the magic number that is closest to but no
greater than the IP address’s interesting octet value
 0
 160
 16
 176
 32
 192
 48
 208
 64
 224
 80
 240
 96
 112
 128
 144
 *interesting octet is the
octet in which the 1’s
change to 0’s
Practice-Subnetting:
 You have been given the IP address 213.45.37.0 /24 You
require at least 15 subnets. List:
 The required subnet mask
 The number of total subnets
 The number of available hosts per subnet
 The first four subnet addresses
 The valid range of host addresses for the first four
subnets
 The Broadcast address for each subnet
Practice-Subnetting:

You have been given the IP address 213.45.37.0 /24 You require at least 15 subnets. List:

The required subnet mask: 255.255.255.240 (/28)

The number of total subnets: 16

The number of available hosts per subnet: 14

The first four subnet addresses:



213.45.37.0

213.45.37.16

213.45.37.32

213.45.37.48
The valid range of host addresses for the first four subnets

213.45.37.1 - 14

213.45.37.17 - 30

213.45.37.33 - 46

213.45.37.49 - 62
The Broadcast address for each subnet

213.45.37.15

213.45.37.31

213.45.37.47

213.45.37.63
 You have been given the IP address 200.100.50.0 /24
You require at least 3 subnets. List:
 The required subnet mask
 The number of total subnets
 The number of available hosts per subnet
 The first four subnet addresses
 The valid range of host addresses for the first four
subnets
 The Broadcast address for each subnet

You have been given the IP address 200.100.50.0 /24 You require at least 3 subnets. List:

The required subnet mask: /26: 255.255.255.192

The number of total subnets: 4

The number of available hosts per subnet: 62

The first four subnet addresses:



200.100.50.0

200.100.50.64

200.100.50.128

200.100.50.192
The valid range of host addresses for the first four subnets

200.100.50.1-62

200.100.50.65-126

200.100.50.129-190

200.100.50.193-254
The Broadcast address for each subnet

200.100.50.63

200.100.50.127

200.100.50.191

200.100.50.255
 You have been given the IP address 10.1.5.10 /29
You require at least 6 subnets. List:
 The required subnet mask
 The number of total subnets
 The number of available hosts per subnet
 The first four subnet addresses
 The valid range of host addresses for the first four
subnets
 The Broadcast address for each subnet
 You have been given the IP address 10.1.5.10 /21
You require at least 6 subnets.
 What subnet mask should you use?
 You have a host at the address of 10.1.5.120 that is
experiencing issues. In order to troubleshoot, what is
the address of that subnet?
 You have been given the IP address 10.1.5.10 /21
You require at least 6 subnets.
 What subnet mask should you use?
 /21: 255.255.248.0
 You have a host at the address of 10.1.5.120 that is
experiencing issues. In order to troubleshoot, what is
the address of that subnet?
 10.1.5.0
 10.5.10.200 /26
 You need to have no more than 25 hosts in each subnet.
 Go.
 Subnets:
 10.5.10.192
 10.5.10.224
 Ranges:
 10.5.10.193 – 222
 10.5.10.225 – 254
 Broadcast:
 10.5.10.223
 10.5.10.255