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Network Address

Lesson 19 of 46 in Coddy's IP Addressing and Subnetting course.

Every subnet reserves its very first address as the network address: all host bits set to 0. It names the subnet itself and can never be assigned to a machine.

You already know how to find it: AND the address with the mask. For 192.168.4.77/28 the mask ends in 240 (11110000), and 77 (01001101) AND 240 keeps only 01000000, which is 64.

So 192.168.4.77 lives in the subnet named 192.168.4.64.

Challenge

Beginner

Find the network address of 192.168.4.77/28 and print it.

Expected output:

192.168.4.64

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 AddressBroadcast 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 /24 Splitting Again Recap - Subnetting Drills

9IPv6 First Steps

Why IPv6 Reading IPv6 Prefixes in IPv6 Recap - IPv6 Basics

Practice on your own: Terminal playground