Tutorials

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

External Resources

This lesson is only a part of a series of IPv4 subnetting lessons. Please visit the below links to learn IPv4 subnetting completely.

• Class C Subnetting Tutorial - Part 1
• Class C Subnetting Tutorial - Part 2
• Class B Subnetting Tutorial - Part 1
• Class B Subnetting Tutorial - Part 2
• Class A Subnetting Tutorial - Part 1
• Class A Subnetting Tutorial - Part 2
• Variable Length Subnet Masking (VLSM)
• Supernetting

### 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

The network 192.168.10.0 is divided into sixteen networks, each network has 16 total IPv4 addresses and 14 usable IPv4 addresses (two IPv4 addresses are used in each subnet to represent the network address and the directed broadcast address).

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

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".

Jajish Thomason