Splitting Again

Lesson 27 of 46 in Coddy's IP Addressing and Subnetting course.

Splits nest. A /26 you carved out a moment ago can itself be cut into /28s, and those into /30s. The rules never change: borrow bits, compute the new block size, list the starts.

Take 192.168.8.64/26 (covering 64-127). Cutting it into /28s means a block size of 16, so the pieces start at 64, 80, 96 and 112, and the last one ends at 127, exactly where the parent ends.

That end check is worth doing every time: children must tile their parent perfectly, no gaps, no spill.

Challenge

Easy

Split 192.168.8.64/26 into /28 subnets. Print each in CIDR notation, one per line, lowest first.

Expected output:

192.168.8.64/28
192.168.8.80/28
192.168.8.96/28
192.168.8.112/28

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 In Splitting a /24Splitting AgainRecap - Subnetting Drills

9IPv6 First Steps

Why IPv6 Reading IPv6 Prefixes in IPv6 Recap - IPv6 Basics

Practice on your own: Terminal playground