Tag: classful subnetting

Classful vs. Classless IP Addressing
CCNA April 19, 2025

Classful vs. Classless IP Addressing: A Deep Dive into Networking Evolution

IP addressing is the backbone of modern networking, enabling devices to communicate across local networks and the internet. Every device—whether a smartphone, server, or IoT sensor—requires a unique IP address to send and receive data. However, the original IP addressing system ( classful addressing ) struggled to scale with the internet’s explosive growth. This led […]
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Table comparing classful and classless addressing formats, with class types A to E, header labels, subnet mask information, and address ranges.
CCNA July 18, 2019

Classful vs Classless Addressing Definitive Guide 2025 – From Confusion to Confidence in IP Addressing

Classful addressing emerged in the early Internet (1980s) with fixed Class A, B, and C ranges, leading to IP address exhaustion. The introduction of CIDR in 1993 marked the shift to classless addressing, allowing flexible prefixes (e.g., /20) and supporting the IPv4-to-IPv6 transition Classful and Classless addressing are terms describing IP address structure, with classless […]
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