Command Palette

Search for a command to run...

Hectal
Phase 1Beginner2 of 8 in Networking

IP Addressing & Subnetting

IPv4, binary, CIDR and subnet math, private vs public ranges, special addresses, and IPv6 — so VPC and Kubernetes network designs stop being magic.

Every VPC, security group, Kubernetes pod range, and firewall rule is written in CIDR notation. This phase makes you fluent: converting between binary and decimal, calculating subnet sizes in your head, planning non-overlapping ranges, and knowing which addresses are special.

0/4 · 0%
4 topics ~33 min 6 code blocks & diagrams
Start with the first topic
1
1.1

IPv4 Addresses and Binary

An IPv4 address is 32 bits written as four decimal numbers (octets); understanding the binary underneath is what makes subnetting easy.

7 min 1 code practice

2
1.2

CIDR Notation and Subnet Math

CIDR writes the mask as a prefix length (/24); a /n network has 2^(32−n) addresses, and splitting or combining networks is just moving that number.

12 min 1 diagram 1 code practice

3
1.3

Private, Public & Special Addresses

Some ranges are reserved for private networks, loopback, link-local, and other special uses; recognising them on sight speeds up every debugging session.

7 min 2 code practice

4
1.4

IPv6 Essentials

IPv6 uses 128-bit addresses written in hex, removes the need for NAT, and is increasingly required in cloud and mobile networks — you should be able to read and reason about it.

7 min 1 code practice