Free Class C Subnetting Tutorial, IP Address Subnetting, How to subnet Class C network

Class C - 4 Bit Subnetting

If we include four bits from the host part to the network part, the subnet mask is changed to 255.255.255.240.

11000000.10101000.00001010.0000 | 0000
11111111.11111111.11111111.1111 | 0000

The four bits added to network part can have sixteen possible values in last (fourth) 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	11000000.10101000.00001010.00000000	192.168.10.0
	First IP Address	11000000.10101000.00001010.00000001	192.168.10.1
	Last IP Address	11000000.10101000.00001010.00001110	192.168.10.14
	Broadcast Address	11000000.10101000.00001010.00001111	192.168.10.15
2	Network Address	11000000.10101000.00001010.00010000	192.168.10.16
	First IP Address	11000000.10101000.00001010.00010001	192.168.10.17
	Last IP Address	11000000.10101000.00001010.00011110	192.168.10.30
	Broadcast Address	11000000.10101000.00001010.00011111	192.168.10.31
3	Network Address	11000000.10101000.00001010.00100000	192.168.10.32
	First IP Address	11000000.10101000.00001010.00100001	192.168.10.33
	Last IP Address	11000000.10101000.00001010.00101110	192.168.10.46
	Broadcast Address	11000000.10101000.00001010.00101111	192.168.10.47
4	Network Address	11000000.10101000.00001010.00110000	192.168.10.48
	First IP Address	11000000.10101000.00001010.00110001	192.168.10.49
	Last IP Address	11000000.10101000.00001010.00111110	192.168.10.62
	Broadcast Address	11000000.10101000.00001010.00111111	192.168.10.63
5	Network Address	11000000.10101000.00001010.01000000	192.168.10.64
	First IP Address	11000000.10101000.00001010.01000001	192.168.10.65
	Last IP Address	11000000.10101000.00001010.01001110	192.168.10.78
	Broadcast Address	11000000.10101000.00001010.01001111	192.168.10.79
6	Network Address	11000000.10101000.00001010.01010000	192.168.10.80
	First IP Address	11000000.10101000.00001010.01010001	192.168.10.81
	Last IP Address	11000000.10101000.00001010.01011110	192.168.10.94
	Broadcast Address	11000000.10101000.00001010.01011111	192.168.10.95
7	Network Address	11000000.10101000.00001010.01100000	192.168.10.96
	First IP Address	11000000.10101000.00001010.01100001	192.168.10.97
	Last IP Address	11000000.10101000.00001010.01101110	192.168.10.110
	Broadcast Address	11000000.10101000.00001010.01101111	192.168.10.111
8	Network Address	11000000.10101000.00001010.01110000	192.168.10.112
	First IP Address	11000000.10101000.00001010.01110001	192.168.10.113
	Last IP Address	11000000.10101000.00001010.01111110	192.168.10.126
	Broadcast Address	11000000.10101000.00001010.01111111	192.168.10.127
9	Network Address	11000000.10101000.00001010.10000000	192.168.10.128
	First IP Address	11000000.10101000.00001010.10000001	192.168.10.129
	Last IP Address	11000000.10101000.00001010.10001110	192.168.10.142
	Broadcast Address	11000000.10101000.00001010.10001111	192.168.10.143
10	Network Address	11000000.10101000.00001010.10010000	192.168.10.144
	First IP Address	11000000.10101000.00001010.10010001	192.168.10.145
	Last IP Address	11000000.10101000.00001010.10011110	192.168.10.158
	Broadcast Address	11000000.10101000.00001010.10011111	192.168.10.159
11	Network Address	11000000.10101000.00001010.10100000	192.168.10.160
	First IP Address	11000000.10101000.00001010.10100001	192.168.10.161
	Last IP Address	11000000.10101000.00001010.10101110	192.168.10.174
	Broadcast Address	11000000.10101000.00001010.10101111	192.168.10.175
12	Network Address	11000000.10101000.00001010.10110000	192.168.10.176
	First IP Address	11000000.10101000.00001010.10110001	192.168.10.177
	Last IP Address	11000000.10101000.00001010.10111110	192.168.10.190
	Broadcast Address	11000000.10101000.00001010.10111111	192.168.10.191
13	Network Address	11000000.10101000.00001010.11000000	192.168.10.192
	First IP Address	11000000.10101000.00001010.11000001	192.168.10.193
	Last IP Address	11000000.10101000.00001010.11001110	192.168.10.206
	Broadcast Address	11000000.10101000.00001010.11001111	192.168.10.207
14	Network Address	11000000.10101000.00001010.11010000	192.168.10.208
	First IP Address	11000000.10101000.00001010.11010001	192.168.10.209
	Last IP Address	11000000.10101000.00001010.11011110	192.168.10.222
	Broadcast Address	11000000.10101000.00001010.11011111	192.168.10.223
15	Network Address	11000000.10101000.00001010.11100000	192.168.10.224
	First IP Address	11000000.10101000.00001010.11100001	192.168.10.225
	Last IP Address	11000000.10101000.00001010.11101110	192.168.10.238
	Broadcast Address	11000000.10101000.00001010.11101111	192.168.10.239
16	Network Address	11000000.10101000.00001010.11110000	192.168.10.240
	First IP Address	11000000.10101000.00001010.11110001	192.168.10.241
	Last IP Address	11000000.10101000.00001010.11111110	192.168.10.254
	Broadcast Address	11000000.10101000.00001010.11111111	192.168.10.255

The network 192.168.10.0 is divided into sixteen networks, each network has 16 total IP addresses and 14 usable IP addresses (two IP addresses are used in each subnet to represent the netwok id and the broadcast id).

From the above examples, you can can clearly understand how to subnet a Class C subnet.

Class C Subnetting can be summerized as below.

Subnet Bits	Subnet Mask	CIDR	Total Subnets	Usable IPs/Subnet
0	255.255.255.0	/24	1	254
1	255.255.255.128	/25	2	126
2	255.255.255.192	/26	4	62
3	255.255.255.224	/27	8	30
4	255.255.255.240	/28	16	14
5	255.255.255.248	/29	32	6
6	255.255.255.252	/30	64	2

In this Class C Subnetting Tutorial - Part 2, you have learned how to perform a Class C 4 bit subnetting. To View Class B Subnetting Tutorial - Part 1, Click "Next".