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IP Addressing Overview

IP (Internet protocol) OSI Model: Layer 3

The purpose of IP addresses is to enable communication between networks.

An Internet Protocol version 4 (IPv4) address is a 32-bit number represented as four octets. This is usually shown in dotted decimal notation.

This notation uses four decimal numbers ranging from 0 - 255.


An IP address is used to identify networks and hosts. The network id and the host id bits depend on the class of address.

Next: Classes of IP Address