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Finding The Network Address
The Next Few Slides Will Show You How to Find the Network ID of an IP
Address
Remember this fundamental relationship!
By User:Gerson Chicareli.Kbrose at en.wikipedia [CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0)], from Wikimedia Commons
Finding Network Address
Find the network address for the IP address – 192.175.33.18 with a mask of 255.255.255.0.
Find the network address for 192.175.33.30 with a mask of 255.255.255.240.
How to determine if they have the same network address.
Finding Network Address
Find the Network Address for the IP Address – 192.175.33.18 With a
Mask of 255.255.255.0
Finding Network Address
Step 1: convert the IP 192.175.33.18 to binary
192 . 175 . 33 . 18
11000000 . 10101111 . 00100001
. 00010010
Given – 192.175.33.18 mask 255.255.255.0
Finding Network Address
Step 2: convert the subnet mask to binary
255 . 255 . 255 . 0
11111111 . 11111111 . 11111111 . 00000000
Given – 192.175.33.18 mask 255.255.255.0
Finding Network Address
Step 3: align the subnet mask to the IP address
192 . 175 . 33 . 18
11000000 . 10101111 . 00100001
. 00010010
11111111 . 11111111 . 11111111 . 00000000
255 . 255 . 255 . 0
Given – 192.175.33.18 mask 255.255.255.0
Finding Network Address
192 . 175 . 33 . 18
11000000 . 10101111 . 00100001
. 00010010
11111111 . 11111111 . 11111111 . 00000000
255 . 255 . 255 . 0
Any 0 in the subnet mask identifies the host bits in the IP address
Finding Network Address
192 . 175 . 33 . 18
11000000 . 10101111 . 00100001
. 00010010
11111111 . 11111111 . 11111111 . 00000000
255 . 255 . 255 . 0
Any 1 in the subnet mask identifies the network bits in the IP address
Finding Network Address
192 . 175 . 33 . 18
11000000 . 10101111 . 00100001
. 00010010
11111111 . 11111111 . 11111111 . 00000000
255 . 255 . 255 . 0
Step 4: in the IP address change all the host bits to zero’s
Finding Network Address
192 . 175 . 33 . 18
11000000 . 10101111 . 00100001
. 00000000
11111111 . 11111111 . 11111111 . 00000000
255 . 255 . 255 . 0
Step 4: in the IP address change all the host bits to zero’s
Finding Network Address
11000000 . 10101111 . 00100001
. 00000000
192 172 33 0
Given – 192.175.33.18 mask 255.255.255.0
Step 5: convert the binary IP back to decimal
Finding Network Address
192 172 33 0
The network address or network ID for 192.175.33.18 with a subnet mask
255.255.255.0
Finding Network Address
Find the Network Address for 192.175.33.30 With a Mask of
255.255.255.240
Finding Network Address
Step 1: convert the IP 192.175.33.30 to binary
192 . 175 . 33 . 30
11000000 . 10101111 . 00100001
. 00011110
Given – 192.175.33.30 mask 255.255.255.240
Finding Network Address
Step 2: convert the subnet mask to binary
255 . 255 . 255 . 240
11111111 . 11111111 . 11111111 . 11110000
Given – 192.175.33.30 mask 255.255.255.240
Finding Network Address
Step 3: align the subnet mask to the IP address
192 . 175 . 33 . 30
11000000 . 10101111 . 00100001
. 00011110
11111111 . 11111111 . 11111111 . 11110000
255 . 255 . 255 . 240
Given – 192.175.33.30 mask 255.255.255.240
Finding Network Address
192 . 175 . 33 . 30
11000000 . 10101111 . 00100001
. 00011110
11111111 . 11111111 . 11111111 . 11110000
255 . 255 . 255 . 240
Any 0 in the subnet mask identifies the host bits in the IP address
Finding Network Address
192 . 175 . 33 . 30
11000000 . 10101111 . 00100001
. 00011110
11111111 . 11111111 . 11111111 . 11110000
255 . 255 . 255 . 240
Any 1 in the subnet mask identifies the network bits in the IP address
Finding Network Address
192 . 175 . 33 . 30
11000000 . 10101111 . 00100001
. 00011110
11111111 . 11111111 . 11111111 . 11110000
255 . 255 . 255 . 240
Step 4: in the IP address change all the host bits to zero’s
Given – 192.175.33.30 mask 255.255.255.240
Finding Network Address
192 . 175 . 33 . 30
11000000 . 10101111 . 00100001
. 00010000
11111111 . 11111111 . 11111111 . 11110000
255 . 255 . 255 . 240
Step 4: in the IP address change all the host bits to zero’s
Given – 192.175.33.30 mask 255.255.255.240
Finding Network Address
11000000 . 10101111 . 00100001
. 00010000
192 . 175 . 33 . 16
Given – 192.175.33.30 mask 255.255.255.240
Step 5: convert the binary IP back to decimal
Finding Network Address
192 172 33 16
The network address or network ID for 192.175.33.18 with a subnet mask
255.255.255.240
This concludes this portion of the lesson.
Now please begin to work the problems.When complete, go on to the next portion of the lesson. If you have difficulty solving the problems, go back and watch the steps in the process carefully.
Remember, you must be comfortable using binary number before attempting this problems.
The number one challenge students have in subnetting is that they are not comfortable with binary numbers. Make sure YOU are not one of them.
