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IPv4 Address Classes Explained: Complete Guide for CCNA

Content Introduction

This tutorial explains the five classes of IPv4 addresses, their specific ranges, purposes, and how to quickly identify each class based on the first octet value, using practical examples and comparisons

Key Information

  • 1IPv4 addresses are divided into 5 classes (A, B, C, D, E) for organized management
  • 2Class A: 1-127 (first octet), Class B: 128-191, Class C: 192-223, Class D: 224-239, Class E: 240-255
  • 3Classes A, B, and C are used for host addressing with different network sizes
  • 4Class D is reserved for multicast applications
  • 5Class E is reserved for experimental purposes
  • 6The first octet value determines the class of any IPv4 address

Content Keywords

#Class A

Large networks with millions of hosts, first octet range 1-127, subnet mask 255.0.0.0

#Class B

Medium networks with thousands of hosts, first octet range 128-191, subnet mask 255.255.0.0

#Class C

Small networks with up to 254 hosts, first octet range 192-223, subnet mask 255.255.255.0

#Class D

Reserved for multicast group communications, first octet range 224-239

#Class E

Reserved for experimental and research purposes, first octet range 240-255

Related Questions and Answers

Q1.Why were IPv4 addresses divided into different classes?

A: Classes were created to organize 4.3 billion addresses for efficient management and assignment, similar to how dictionaries organize words alphabetically for quick lookup

Q2.How can you quickly determine the class of an IP address?

A: Look at the first octet value: 1-127 = Class A, 128-191 = Class B, 192-223 = Class C, 224-239 = Class D, 240-255 = Class E

Q3.What are the main differences between Class A, B, and C networks?

A: Class A has few networks with many hosts (16M+), Class B has moderate networks with moderate hosts (65K), Class C has many networks with few hosts (254)

Q4.Which classes are actually used for regular host addressing?

A: Only Classes A, B, and C are used for regular host devices. Class D is for multicast and Class E is reserved for experiments

Q5.What is the purpose of Class D and Class E addresses?

A: Class D is used for multicast applications where data is sent to multiple devices simultaneously, while Class E is reserved for experimental and research purposes

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