This subnetting course covers IPv4 addressing, subnet masks, CIDR notation, VLSM (Variable Length Subnet Mask), and real-world IP network design. It is designed for network engineers, IT professionals, and anyone learning subnetting from scratch.
Subnetting Step by Step is a complete learning series designed to help you master subnetting, from the fundamentals of binary and IPv4 addressing to VLSM, larger network blocks, and real-world subnet design.
Each episode builds on the previous one, but you can also use this page as a reference hub and jump directly to the topic you need.
Learn the binary foundation behind IPv4 addressing. This episode explains how 8-bit binary values map to decimal numbers, how to convert between the two, and why binary matters in networking.
Understand the structure of an IPv4 address, including octets, 32-bit representation, binary vs decimal, and the difference between public and private IP addresses.
🎥 Watch this episode: What Is an IP Address? (Episode 1)
🎬 Episode 1 – Watch the full explanation
Learn how subnet masks separate the network portion from the host portion of an IP address and how CIDR notation such as /24 or /26 works.
🎥 Watch this episode: What Is a Subnet Mask? (Episode 2)
Learn how to identify the network ID, broadcast address, and usable IP range using subnet masks and network boundaries.
🎥 Watch this episode: Network ID and Broadcast Explained (Episode 3)
🎬 Episode 3 – Watch the full explanation
Learn how to split a large network into smaller subnets by borrowing host bits, creating new subnet masks, and calculating subnet ranges.
🎥 Watch this episode: How to Subnet a Network Step by Step (Episode 4)
🎬 Episode 4 – Watch the full explanation
Speed up your subnetting with block size logic, valid subnet mask values, and simple techniques to calculate ranges quickly without binary.
🎥 Watch this episode: Subnetting Shortcut Tricks (Episode 5)
🎬 Episode 5 – Watch the full explanation
Learn how to assign different subnet sizes based on real requirements and efficiently use IP address space with VLSM.
🎥 Watch this episode: VLSM Explained (Episode 6)
🎬 Episode 6 – Watch the full explanation
Learn how to subnet larger networks beyond /24 and understand how CIDR allows scaling across multiple octets.
🎥 Watch this episode: Subnetting Beyond /24 Explained (Episode 7)
🎬 Episode 7 – Watch the full explanation
Apply your subnetting skills with real-world scenarios and test your understanding through practical exercises.
🎥 Watch this episode: Subnetting Practice Challenge (Episode 8)
🎬 Episode 8 – Watch the full explanation
Learn the most common subnetting mistakes and how to avoid issues like overlapping networks, incorrect assumptions, and poor planning.
🎥 Watch this episode: Subnetting Mistakes and How to Avoid Them (Episode 9)
🎬 Episode 9 – Watch the full explanation
Discover practical subnetting tools and calculators that help validate your work, visualize IP ranges, and speed up network design.
🎥 Watch this episode: IP Calculators and Tools Explained (Episode 10)
🎬 Episode 10 – Watch the full explanation
Subnetting is not just an exam topic. It is a core networking skill used in real environments to structure IP space, separate services, plan growth, and reduce operational confusion.
As networks become larger and more segmented, keeping track of subnets manually becomes difficult. That is where IP Address Management (IPAM) platforms become valuable.
IPAM365 helps teams manage subnets, track IP allocations, support segmented environments, and maintain visibility as networks grow. It brings subnet structure and IP management into one clear and centralized platform.
👉 Start using IPAM365 for free
Also explore: Subnetting Guide, What is IPAM?, and What is VRF?.