# IP Addressing, Part II: Scaling IPv4 Across the Internet

DevFeed: [IP Addressing, Part II: Scaling IPv4 Across the Internet](<https://devfeed.tech/articles/ip-addressing-part-ii-scaling-ipv4-across-the-internet-18195.md>)

Original publisher: [Read original article](<https://newsletter.francofernando.com/p/ip-addressing-part-ii-scaling-ipv4>)

Author: Franco Fernando

Published: 2026-08-01T11:36:30Z

Content type: article

Language: en

Sources: [The Polymathic Engineer](<https://devfeed.tech/sources/the-polymathic-engineer.md>)

Topics: [Internet](<https://devfeed.tech/topics/internet.md>)

Tags: [internet](<https://devfeed.tech/tags/internet.md>), [ip](<https://devfeed.tech/tags/ip.md>), [ipv4](<https://devfeed.tech/tags/ipv4.md>), [nat](<https://devfeed.tech/tags/nat.md>)

## AI overview

This article explains how CIDR replaced classful addressing and how private addresses and NAT helped extend the usable life of IPv4.

## Source excerpt

How classful addressing gave way to CIDR, and how private addresses and NAT kept the world from running out of IPv4.