Class C Subnetting Master

Class C Subnetting: The Core Analysis

A standard Class "C" IPv4 network is defined by a default mask of 255.255.255.0 or the CIDR notation /24. Subnetting involves borrowing host bits (from the 4th octet) to create subnets.

CIDR	Subnet Mask	Borrowed Bits (n)	# of Subnets ($2^n$)	Host Bits (h)	Usable Hosts ($2^h - 2$)	Block Size
/25	255.255.255.128	1	2	7	126	128
/26	255.255.255.192	2	4	6	62	64
/27	255.255.255.224	3	8	5	30	32
/28	255.255.255.240	4	16	4	14	16

Key Addresses: For any subnet, the Network Address is the first address (all host bits 0) and the Broadcast Address is the last address (all host bits 1). Usable host addresses are those between the Network and Broadcast addresses.

Subnetting Challenge

Network Address: 192.168.1.0

Required CIDR: /26

Your Answers

Subnet Mask (Dotted Decimal)

Total Number of Subnets

Usable Hosts Per Subnet

Network Address of the Second Subnet

Broadcast Address of the Second Subnet

Controls & Feedback

Detailed Feedback:

Ready for your first challenge! Press "NEW CHALLENGE" to begin.

Need a Hint?

Focus on the borrowed bits ($n$) to find the block size ($2^{8-n}$).