Subnetting class B
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Jan 25, 2016
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About This Presentation
Learn Sub netting
Slide Content
Sub netting Notes: Class B
By Muhammad Hammad
In this Class B Sub netting you will learn how to subnet a Class B network.
Class B Sub netting:
Remember, the first two octets of a Class B network is used to represent the network and the
last two octets are used to represent the host. The default format for a Class B IPv4 address is
Network.Network.Host.Host.
Let us consider an example of Class B network 172.16.0.0 - 255.255.0.0. The binary representation of the
above network and subnet mask is
Component Binary Decimal
Address Part 10101100.00010000.00000000.00000000 172.16.0.0
SN Mask 11111111.11111111.00000000.00000000 255.255.0.0
If all the bits in the host part are "0", that represents the network id.
If all the bits in the host part are "0" except the last bit, it is the first usable IPv4 address.
If all the bits in the host part are "1" except the last bit, it is the last usable IPv4 address.
If all the bits in the host part are "1", that represents the directed broadcast address.
All the IPv4 addresses between the first and last IPv4 addresses (including the first and last) can be used
to configure the devices.
By Muhammad Hammad
In this Class B Sub netting you will learn how to subnet a Class B network.
Class B Sub netting:
Remember, the first two octets of a Class B network is used to represent the network and the
last two octets are used to represent the host. The default format for a Class B IPv4 address is
Network.Network.Host.Host.
Let us consider an example of Class B network 172.16.0.0 - 255.255.0.0. The binary representation of the
above network and subnet mask is
Component Binary Decimal
Address Part 10101100.00010000.00000000.00000000 172.16.0.0
SN Mask 11111111.11111111.00000000.00000000 255.255.0.0
If all the bits in the host part are "0", that represents the network id.
If all the bits in the host part are "0" except the last bit, it is the first usable IPv4 address.
If all the bits in the host part are "1" except the last bit, it is the last usable IPv4 address.
If all the bits in the host part are "1", that represents the directed broadcast address.
All the IPv4 addresses between the first and last IPv4 addresses (including the first and last) can be used
to configure the devices.
Class B - One Bit Sub netting:
If we include one bit from the host part to the network part, the subnet mask is changed into
255.255.128.0 The single bit can have two values in third octet, either 0 or 1.
10101100.00010000.0 | 0000000.00000000
11111111.11111111.1 | 0000000.00000000
That means, we can get two subnets if we do a single bit sub netting.
SN No Description Binaries Decimal
1
Network Address 10101100.00010000.00000000.00000000 172.16.0.0
First IPv4 address 10101100.00010000.00000000.00000001 172.16.0.1
Last IPv4 address 10101100.00010000.01111111.11111110 172.16.127.254
Broadcast Address 10101100.00010000.01111111.11111111 172.16.127.255
2
Network Address 10101100.00010000.10000000.00000000 172.16.128.0
First IPv4 address 10101100.00010000.10000000.00000001 172.16.128.1
Last IPv4 address 10101100.00010000.11111111.11111110 172.16.255.254
Broadcast Address 10101100.00010000.11111111.11111111 172.16.255.255
The network 172.16.0.0 is divided into two networks, each network has 32768 total IPv4 addresses and 32766
usableIPv4 addresses (two IPv4 addresses are used in each subnet to represent the network address and the directed
broadcast address). The subnet mask for one bit sub netting is 255.255.128.0.
If we include one bit from the host part to the network part, the subnet mask is changed into
255.255.128.0 The single bit can have two values in third octet, either 0 or 1.
10101100.00010000.0 | 0000000.00000000
11111111.11111111.1 | 0000000.00000000
That means, we can get two subnets if we do a single bit sub netting.
SN No Description Binaries Decimal
1
Network Address 10101100.00010000.00000000.00000000 172.16.0.0
First IPv4 address 10101100.00010000.00000000.00000001 172.16.0.1
Last IPv4 address 10101100.00010000.01111111.11111110 172.16.127.254
Broadcast Address 10101100.00010000.01111111.11111111 172.16.127.255
2
Network Address 10101100.00010000.10000000.00000000 172.16.128.0
First IPv4 address 10101100.00010000.10000000.00000001 172.16.128.1
Last IPv4 address 10101100.00010000.11111111.11111110 172.16.255.254
Broadcast Address 10101100.00010000.11111111.11111111 172.16.255.255
The network 172.16.0.0 is divided into two networks, each network has 32768 total IPv4 addresses and 32766
usableIPv4 addresses (two IPv4 addresses are used in each subnet to represent the network address and the directed
broadcast address). The subnet mask for one bit sub netting is 255.255.128.0.
Class B - Two Bit Sub netting:
If we include two bits from the host part to the network part, the subnet mask is changed into 255.255.192.0. The
two bits added to network part can have four possible values in third octet, 00, 01, 10, and 11.
10101100.00010000.00 | 000000.00000000
11111111.11111111.11 | 000000.00000000
That means, we can get four networks if we do a two bit sub netting.
SN No Description Binaries Decimal
1
Network Address 10101100.00010000.00000000.00000000 172.16.0.0
First IPv4 address 10101100.00010000.00000000.00000001 172.16.0.1
Last IPv4 address 10101100.00010000.00111111.11111110 172.16.63.254
Broadcast Address 10101100.00010000.00111111.11111111 172.16.63.255
2
Network Address 10101100.00010000.01000000.00000000 172.16.64.0
First IPv4 address 10101100.00010000.01000000.00000001 172.16.64.1
Last IPv4 address 10101100.00010000.01111111.11111110 172.16.127.254
Broadcast Address 10101100.00010000.01111111.11111111 172.16.127.255
3
Network Address 10101100.00010000.10000000.00000000 172.16.128.0
First IPv4 address 10101100.00010000.10000000.00000001 172.16.128.1
Last IPv4 address 10101100.00010000.10111111.11111110 172.16.191.254
Broadcast Address 10101100.00010000.10111111.11111111 172.16.191.255
If we include two bits from the host part to the network part, the subnet mask is changed into 255.255.192.0. The
two bits added to network part can have four possible values in third octet, 00, 01, 10, and 11.
10101100.00010000.00 | 000000.00000000
11111111.11111111.11 | 000000.00000000
That means, we can get four networks if we do a two bit sub netting.
SN No Description Binaries Decimal
1
Network Address 10101100.00010000.00000000.00000000 172.16.0.0
First IPv4 address 10101100.00010000.00000000.00000001 172.16.0.1
Last IPv4 address 10101100.00010000.00111111.11111110 172.16.63.254
Broadcast Address 10101100.00010000.00111111.11111111 172.16.63.255
2
Network Address 10101100.00010000.01000000.00000000 172.16.64.0
First IPv4 address 10101100.00010000.01000000.00000001 172.16.64.1
Last IPv4 address 10101100.00010000.01111111.11111110 172.16.127.254
Broadcast Address 10101100.00010000.01111111.11111111 172.16.127.255
3
Network Address 10101100.00010000.10000000.00000000 172.16.128.0
First IPv4 address 10101100.00010000.10000000.00000001 172.16.128.1
Last IPv4 address 10101100.00010000.10111111.11111110 172.16.191.254
Broadcast Address 10101100.00010000.10111111.11111111 172.16.191.255
4
Network Address 10101100.00010000.11000000.00000000 172.16.192.0
First IPv4 address 10101100.00010000.11000000.00000001 172.16.192.1
Last IPv4 address 10101100.00010000.11111111.11111110 172.16.255.254
Broadcast Address 10101100.00010000.11111111.11111111 172.16.255.255
The network 172.16.0.0 is divided into four networks, each network has 16384 total IPv4 addresses and 16382
usableIPv4 addresses (two IPv4 addresses are used in each subnet to represent the network address and the directed
broadcast address). The subnet mask for one bit sub netting is 255.255.192.0.
Class B - 3 Bit Sub netting:
If we include three bits from the host part to the network part, the subnet mask is changed into 255.255.224.0
The three bits added to network part can have eight possible values in the third octet and that are 000, 001,
010, and 011, 100, 101, 110 and 111.
10101100.00010000.000 | 00000.00000000
11111111.11111111.111 | 00000.00000000
That means, we can get eight networks if we do a three-bit sub netting.
SN No Description Binaries Decimal
1
Network Address 10101100.00010000.00000000.00000000 172.16.0.0
First IPv4 address 10101100.00010000.00000000.00000001 172.16.0.1
Last IPv4 address 10101100.00010000.00011111.11111110 172.16.31.254
Broadcast Address 10101100.00010000.00011111.11111111 172.16.31.255
2 Network Address 10101100.00010000.00100000.00000000 172.16.32.0
Network Address 10101100.00010000.11000000.00000000 172.16.192.0
First IPv4 address 10101100.00010000.11000000.00000001 172.16.192.1
Last IPv4 address 10101100.00010000.11111111.11111110 172.16.255.254
Broadcast Address 10101100.00010000.11111111.11111111 172.16.255.255
The network 172.16.0.0 is divided into four networks, each network has 16384 total IPv4 addresses and 16382
usableIPv4 addresses (two IPv4 addresses are used in each subnet to represent the network address and the directed
broadcast address). The subnet mask for one bit sub netting is 255.255.192.0.
Class B - 3 Bit Sub netting:
If we include three bits from the host part to the network part, the subnet mask is changed into 255.255.224.0
The three bits added to network part can have eight possible values in the third octet and that are 000, 001,
010, and 011, 100, 101, 110 and 111.
10101100.00010000.000 | 00000.00000000
11111111.11111111.111 | 00000.00000000
That means, we can get eight networks if we do a three-bit sub netting.
SN No Description Binaries Decimal
1
Network Address 10101100.00010000.00000000.00000000 172.16.0.0
First IPv4 address 10101100.00010000.00000000.00000001 172.16.0.1
Last IPv4 address 10101100.00010000.00011111.11111110 172.16.31.254
Broadcast Address 10101100.00010000.00011111.11111111 172.16.31.255
2 Network Address 10101100.00010000.00100000.00000000 172.16.32.0
First IPv4 address 10101100.00010000.00100000.00000001 172.16.32.1
Last IPv4 address 10101100.00010000.00111111.11111110 172.16.63.254
Broadcast Address 10101100.00010000.00111111.11111111 172.16.63.255
3
Network Address 10101100.00010000.01000000.00000000 172.16.64.0
First IPv4 address 10101100.00010000.01000000.00000001 172.16.64.1
Last IPv4 address 10101100.00010000.01011111.11111110 172.16.95.254
Broadcast Address 10101100.00010000.01011111.11111111 172.16.95.255
4
Network Address 10101100.00010000.01100000.00000000 172.16.96.0
First IPv4 address 10101100.00010000.01100000.00000001 172.16.96.1
Last IPv4 address 10101100.00010000.01111111.11111110 172.16.127.254
Broadcast Address 10101100.00010000.01111111.11111111 172.16.127.255
5
Network Address 10101100.00010000.10000000.00000000 172.16.128.0
First IPv4 address 10101100.00010000.10000000.00000001 172.16.128.1
Last IPv4 address 10101100.00010000.10011111.11111110 172.16.159.254
Broadcast Address 10101100.00010000.10011111.11111111 172.16.159.255
6
Network Address 10101100.00010000.10100000.00000000 172.16.160.0
First IPv4 address 10101100.00010000.10100000.00000001 172.16.160.1
Last IPv4 address 10101100.00010000.10111111.11111110 172.16.191.254
Broadcast Address 10101100.00010000.10111111.11111111 172.16.191.255
Last IPv4 address 10101100.00010000.00111111.11111110 172.16.63.254
Broadcast Address 10101100.00010000.00111111.11111111 172.16.63.255
3
Network Address 10101100.00010000.01000000.00000000 172.16.64.0
First IPv4 address 10101100.00010000.01000000.00000001 172.16.64.1
Last IPv4 address 10101100.00010000.01011111.11111110 172.16.95.254
Broadcast Address 10101100.00010000.01011111.11111111 172.16.95.255
4
Network Address 10101100.00010000.01100000.00000000 172.16.96.0
First IPv4 address 10101100.00010000.01100000.00000001 172.16.96.1
Last IPv4 address 10101100.00010000.01111111.11111110 172.16.127.254
Broadcast Address 10101100.00010000.01111111.11111111 172.16.127.255
5
Network Address 10101100.00010000.10000000.00000000 172.16.128.0
First IPv4 address 10101100.00010000.10000000.00000001 172.16.128.1
Last IPv4 address 10101100.00010000.10011111.11111110 172.16.159.254
Broadcast Address 10101100.00010000.10011111.11111111 172.16.159.255
6
Network Address 10101100.00010000.10100000.00000000 172.16.160.0
First IPv4 address 10101100.00010000.10100000.00000001 172.16.160.1
Last IPv4 address 10101100.00010000.10111111.11111110 172.16.191.254
Broadcast Address 10101100.00010000.10111111.11111111 172.16.191.255
7
Network Address 10101100.00010000.11000000.00000000 172.16.192.0
First IPv4 address 10101100.00010000.11000000.00000001 172.16.192.1
Last IPv4 address 10101100.00010000.11011111.11111110 172.16.223.254
Broadcast Address 10101100.00010000.11011111.11111111 172.16.223.255
8
Network Address 10101100.00010000.11100000.00000000 172.16.224.0
First IPv4 address 10101100.00010000.11100000.00000001 172.16.224.1
Last IPv4 address 10101100.00010000.11111111.11111110 172.16.255.254
Broadcast Address 10101100.00010000.11111111.11111111 172.16.255.255
The network 172.16.0.0 is divided into eight networks, each network has 8192 total IPv4 addresses and 8190
usableIPv4 addresses (two IPv4 addresses are used in each subnet to represent the network address and the directed
broadcast address).
Class B - 4 Bit Sub netting:
If we include four bits from the host part to the network part, the subnet mask is changed to 255.255.240.0.
10101100.00010000.0000 | 0000.00000000
11111111.11111111.1111 | 0000.00000000
The four bits added to network part can have sixteen possible values in third octet and that are 0000, 0001, 0010,
0011, 0100, 0101, 0110, 0111, 1000, 1001, 1010, 1011, 1100, 1101, 1110, 1111.
SN No Description Binaries Decimal
1
Network Address 10101100.00010000.00000000.00000000 172.16.0.0
First IP Address 10101100.00010000.00000000.00000001 172.16.0.1
Network Address 10101100.00010000.11000000.00000000 172.16.192.0
First IPv4 address 10101100.00010000.11000000.00000001 172.16.192.1
Last IPv4 address 10101100.00010000.11011111.11111110 172.16.223.254
Broadcast Address 10101100.00010000.11011111.11111111 172.16.223.255
8
Network Address 10101100.00010000.11100000.00000000 172.16.224.0
First IPv4 address 10101100.00010000.11100000.00000001 172.16.224.1
Last IPv4 address 10101100.00010000.11111111.11111110 172.16.255.254
Broadcast Address 10101100.00010000.11111111.11111111 172.16.255.255
The network 172.16.0.0 is divided into eight networks, each network has 8192 total IPv4 addresses and 8190
usableIPv4 addresses (two IPv4 addresses are used in each subnet to represent the network address and the directed
broadcast address).
Class B - 4 Bit Sub netting:
If we include four bits from the host part to the network part, the subnet mask is changed to 255.255.240.0.
10101100.00010000.0000 | 0000.00000000
11111111.11111111.1111 | 0000.00000000
The four bits added to network part can have sixteen possible values in third octet and that are 0000, 0001, 0010,
0011, 0100, 0101, 0110, 0111, 1000, 1001, 1010, 1011, 1100, 1101, 1110, 1111.
SN No Description Binaries Decimal
1
Network Address 10101100.00010000.00000000.00000000 172.16.0.0
First IP Address 10101100.00010000.00000000.00000001 172.16.0.1
Last IP Address 10101100.00010000.00001111.11111110 172.16.15.254
Broadcast Address 10101100.00010000.00001111.11111111 172.16.15.255
2
Network Address 10101100.00010000.00010000.00000000 172.16.16.0
First IP Address 10101100.00010000.00010000.00000001 172.16.16.1
Last IP Address 10101100.00010000.00011111.11111110 172.16.31.254
Broadcast Address 10101100.00010000.00011111.11111111 172.16.31.255
3
Network Address 10101100.00010000.00100000.00000000 172.16.32.0
First IP Address 10101100.00010000.00100000.00000001 172.16.32.01
Last IP Address 10101100.00010000.00101111.11111110 172.16.47.254
Broadcast Address 10101100.00010000.00101111.11111111 172.16.47.255
4
Network Address 10101100.00010000.00110000.00000000 172.16.48.0
First IP Address 10101100.00010000.00110000.00000001 172.16.48.1
Last IP Address 10101100.00010000.00111111.11111110 172.16.63.254
Broadcast Address 10101100.00010000.00111111.11111111 172.16.63.255
5
Network Address 10101100.00010000.01000000.00000000 172.16.64.0
First IP Address 10101100.00010000.01000000.00000001 172.16.64.1
Last IP Address 10101100.00010000.01001111.11111110 172.16.79.254
Broadcast Address 10101100.00010000.01001111.11111110 172.16.79.255
6 Network Address 10101100.00010000.01010000.00000000 172.16.80.0
Broadcast Address 10101100.00010000.00001111.11111111 172.16.15.255
2
Network Address 10101100.00010000.00010000.00000000 172.16.16.0
First IP Address 10101100.00010000.00010000.00000001 172.16.16.1
Last IP Address 10101100.00010000.00011111.11111110 172.16.31.254
Broadcast Address 10101100.00010000.00011111.11111111 172.16.31.255
3
Network Address 10101100.00010000.00100000.00000000 172.16.32.0
First IP Address 10101100.00010000.00100000.00000001 172.16.32.01
Last IP Address 10101100.00010000.00101111.11111110 172.16.47.254
Broadcast Address 10101100.00010000.00101111.11111111 172.16.47.255
4
Network Address 10101100.00010000.00110000.00000000 172.16.48.0
First IP Address 10101100.00010000.00110000.00000001 172.16.48.1
Last IP Address 10101100.00010000.00111111.11111110 172.16.63.254
Broadcast Address 10101100.00010000.00111111.11111111 172.16.63.255
5
Network Address 10101100.00010000.01000000.00000000 172.16.64.0
First IP Address 10101100.00010000.01000000.00000001 172.16.64.1
Last IP Address 10101100.00010000.01001111.11111110 172.16.79.254
Broadcast Address 10101100.00010000.01001111.11111110 172.16.79.255
6 Network Address 10101100.00010000.01010000.00000000 172.16.80.0
First IP Address 10101100.00010000.01010000.00000001 172.16.80.1
Last IP Address 10101100.00010000.01011111.11111110 172.16.95.254
Broadcast Address 10101100.00010000.01011111.11111111 172.16.95.255
7
Network Address 10101100.00010000.01100000.00000000 172.16.96.0
First IP Address 10101100.00010000.01100000.00000001 172.16.96.1
Last IP Address 10101100.00010000.01101111.11111110 172.16.111.254
Broadcast Address 10101100.00010000.01101111.11111110 172.16.111.255
8
Network Address 10101100.00010000.01110000.00000000 172.16.112.0
First IP Address 10101100.00010000.01110000.00000001 172.16.112.1
Last IP Address 10101100.00010000.01111111.11111110 172.16.127.254
Broadcast Address 10101100.00010000.01111111.11111111 172.16.127.255
9
Network Address 10101100.00010000.10000000.00000000 172.16.128.0
First IP Address 10101100.00010000.10000000.00000001 172.16.128.1
Last IP Address 10101100.00010000.10001111.11111110 172.16.143.254
Broadcast Address 10101100.00010000.10001111.11111111 172.16.143.255
10
Network Address 10101100.00010000.10010000.00000000 172.16.144.0
First IP Address 10101100.00010000.10010000.00000001 172.16.144.1
Last IP Address 10101100.00010000.10011111.11111110 172.16.159.254
Broadcast Address 10101100.00010000.10011111.11111111 172.16.159.255
Last IP Address 10101100.00010000.01011111.11111110 172.16.95.254
Broadcast Address 10101100.00010000.01011111.11111111 172.16.95.255
7
Network Address 10101100.00010000.01100000.00000000 172.16.96.0
First IP Address 10101100.00010000.01100000.00000001 172.16.96.1
Last IP Address 10101100.00010000.01101111.11111110 172.16.111.254
Broadcast Address 10101100.00010000.01101111.11111110 172.16.111.255
8
Network Address 10101100.00010000.01110000.00000000 172.16.112.0
First IP Address 10101100.00010000.01110000.00000001 172.16.112.1
Last IP Address 10101100.00010000.01111111.11111110 172.16.127.254
Broadcast Address 10101100.00010000.01111111.11111111 172.16.127.255
9
Network Address 10101100.00010000.10000000.00000000 172.16.128.0
First IP Address 10101100.00010000.10000000.00000001 172.16.128.1
Last IP Address 10101100.00010000.10001111.11111110 172.16.143.254
Broadcast Address 10101100.00010000.10001111.11111111 172.16.143.255
10
Network Address 10101100.00010000.10010000.00000000 172.16.144.0
First IP Address 10101100.00010000.10010000.00000001 172.16.144.1
Last IP Address 10101100.00010000.10011111.11111110 172.16.159.254
Broadcast Address 10101100.00010000.10011111.11111111 172.16.159.255
11
Network Address 10101100.00010000.10100000.00000000 172.16.160.0
First IP Address 10101100.00010000.10100000.00000001 172.16.160.1
Last IP Address 10101100.00010000.10101111.11111110 172.16.175.254
Broadcast Address 10101100.00010000.10101111.11111111 172.16.175.255
12
Network Address 10101100.00010000.10110000.00000000 172.16.176.0
First IP Address 10101100.00010000.10110000.00000001 172.16.176.1
Last IP Address 10101100.00010000.10111111.11111110 172.16.191.254
Broadcast Address 10101100.00010000.10111111.11111111 172.16.191.255
13
Network Address 10101100.00010000.11000000.00000000 172.16.192.0
First IP Address 10101100.00010000.11000000.00000001 172.16.192.1
Last IP Address 10101100.00010000.11001111.11111110 172.16.207.254
Broadcast Address 10101100.00010000.11001111.11111111 172.16.207.255
14
Network Address 10101100.00010000.11010000.00000000 172.16.208.0
First IP Address 10101100.00010000.11010000.00000001 172.16.208.1
Last IP Address 10101100.00010000.11011111.11111110 172.16.223.254
Broadcast Address 10101100.00010000.11011111.11111111 172.16.223.255
15
Network Address 10101100.00010000.11100000.00000000 172.16.224.0
First IP Address 10101100.00010000.11100000.00000001 172.16.224.1
Last IP Address 10101100.00010000.11101111.11111110 172.16.239.254
Network Address 10101100.00010000.10100000.00000000 172.16.160.0
First IP Address 10101100.00010000.10100000.00000001 172.16.160.1
Last IP Address 10101100.00010000.10101111.11111110 172.16.175.254
Broadcast Address 10101100.00010000.10101111.11111111 172.16.175.255
12
Network Address 10101100.00010000.10110000.00000000 172.16.176.0
First IP Address 10101100.00010000.10110000.00000001 172.16.176.1
Last IP Address 10101100.00010000.10111111.11111110 172.16.191.254
Broadcast Address 10101100.00010000.10111111.11111111 172.16.191.255
13
Network Address 10101100.00010000.11000000.00000000 172.16.192.0
First IP Address 10101100.00010000.11000000.00000001 172.16.192.1
Last IP Address 10101100.00010000.11001111.11111110 172.16.207.254
Broadcast Address 10101100.00010000.11001111.11111111 172.16.207.255
14
Network Address 10101100.00010000.11010000.00000000 172.16.208.0
First IP Address 10101100.00010000.11010000.00000001 172.16.208.1
Last IP Address 10101100.00010000.11011111.11111110 172.16.223.254
Broadcast Address 10101100.00010000.11011111.11111111 172.16.223.255
15
Network Address 10101100.00010000.11100000.00000000 172.16.224.0
First IP Address 10101100.00010000.11100000.00000001 172.16.224.1
Last IP Address 10101100.00010000.11101111.11111110 172.16.239.254
Broadcast Address 10101100.00010000.11101111.11111111 172.16.239.255
16
Network Address 10101100.00010000.11110000.00000000 172.16.240.0
First IP Address 10101100.00010000.11110000.00000001 172.16.240.1
Last IP Address 10101100.00010000.11111111.11111110 172.16.255.254
Broadcast Address 10101100.00010000.11111111.11111111 172.16.255.255
The network 172.16.0.0 is divided into sixteen networks, each network has 4096 total IPv4 addresses and 4094
usable IPv4 addresses (two IPv4 addresses are used in each subnet to represent the network address and the directed
broadcast address). The subnet mask is 255.255.240.0.
Class B Sub netting can be summarized as below.
Subnet Bits Subnet Mask CIDR Total Subnets Usable IP Address/Subnet
0 255.255.0.0 /16 1 65534
1 255.255.128.0 /17 2 32766
2 255.255.192.0 /18 4 16382
3 255.255.224.0 /19 8 8190
4 255.255.240.0 /20 16 4094
5 255.255.248.0 /21 32 2046
6 255.255.252.0 /22 64 1022
7 255.255.254.0 /23 128 510
8 255.255.255.0 /24 256 254
16
Network Address 10101100.00010000.11110000.00000000 172.16.240.0
First IP Address 10101100.00010000.11110000.00000001 172.16.240.1
Last IP Address 10101100.00010000.11111111.11111110 172.16.255.254
Broadcast Address 10101100.00010000.11111111.11111111 172.16.255.255
The network 172.16.0.0 is divided into sixteen networks, each network has 4096 total IPv4 addresses and 4094
usable IPv4 addresses (two IPv4 addresses are used in each subnet to represent the network address and the directed
broadcast address). The subnet mask is 255.255.240.0.
Class B Sub netting can be summarized as below.
Subnet Bits Subnet Mask CIDR Total Subnets Usable IP Address/Subnet
0 255.255.0.0 /16 1 65534
1 255.255.128.0 /17 2 32766
2 255.255.192.0 /18 4 16382
3 255.255.224.0 /19 8 8190
4 255.255.240.0 /20 16 4094
5 255.255.248.0 /21 32 2046
6 255.255.252.0 /22 64 1022
7 255.255.254.0 /23 128 510
8 255.255.255.0 /24 256 254
9 255.255.255.128 /25 512 126
10 255.255.255.192 /26 1024 62
11 255.255.255.224 /27 2048 30
12 255.255.255.240 /28 4096 14
13 255.255.255.248 /29 8192 6
14 255.255.255.252 /30 16384 2
10 255.255.255.192 /26 1024 62
11 255.255.255.224 /27 2048 30
12 255.255.255.240 /28 4096 14
13 255.255.255.248 /29 8192 6
14 255.255.255.252 /30 16384 2
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