Splitting a /24

Lesson 26 of 46 in Coddy's IP Addressing and Subnetting course.

Subnetting proper: taking one block and cutting it into equal smaller ones. Each bit you borrow from the host part doubles the number of subnets and halves their size.

Split 10.0.5.0/24 by borrowing 2 bits and you get four /26 subnets. Their starts follow the block size (64): .0, .64, .128, .192.

Splits always produce a power of two: you can cut a block into 2, 4, 8... pieces, never 3.

Challenge

Easy

Split 10.0.5.0/24 into four equal subnets. Print each one in CIDR notation, one per line, lowest first.

Expected output:

10.0.5.0/26
10.0.5.64/26
10.0.5.128/26
10.0.5.192/26

Try it yourself

Terminal

All lessons in IP Addressing and Subnetting

1Bits and Binary

Numbers as Bits Binary to Decimal Powers of Two Recap - Binary Warm-up

4CIDR Notation

Goodbye Classes Reading CIDR Block Sizes Recap - CIDR Reading

7Special Addresses

Private Ranges Loopback Link-Local Zero and Broadcast

10Capstone - The Office

The Floor Plan Sizing Each Team Carving the Block The Router's View Recap - Ship the Plan

2IPv4 Anatomy

Four Octets The 32-Bit View Network and Host Valid or Not Recap - Read an Address

5Inside a Subnet

Network Address Broadcast Address Usable Hosts First and Last Host Recap - Subnet Facts

8Planning Networks

Right-Sizing VLSM Step by Step Allocation Order Checking for Overlap Recap - Plan a Network

3The Subnet Mask

What a Mask Does Mask to Prefix Prefix to Mask ANDing It Out Recap - Mask Basics

6Subnetting Drills

The Block Size Trick Which Subnet Am I InSplitting a /24Splitting Again Recap - Subnetting Drills

9IPv6 First Steps

Why IPv6 Reading IPv6 Prefixes in IPv6 Recap - IPv6 Basics

Practice on your own: Terminal playground