The Lazy Networker

An IP Address (Internet Protocol Address) is a unique logical address assigned to each device in a network so that it can be identified and communicate with other devices.

👉 Think of it like the phone number of a device on a network.
Without it, devices cannot send/receive data properly.

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✅ Types of IP Addresses

1. IPv4 (Internet Protocol version 4)
2. IPv6 (Internet Protocol version 6) – newer, because IPv4 addresses are running out.

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✅ IPv4 (Internet Protocol version 4)

• Most widely used IP version today.
• 32-bit address (4 bytes).
• Written as 4 decimal numbers separated by dots.
• Each number ranges from 0–255.
• Example: 192.168.1.10 10.0.0.5 172.16.254.1

🔹 IPv4 Address Classes

IPv4 is divided into classes (for different network sizes):

Class	Range (First Octet)	Example	Usage
A	1 – 126	10.0.0.1	Very large networks
B	128 – 191	172.16.0.1	Medium networks
C	192 – 223	192.168.1.1	Small networks
D	224 – 239	224.0.0.1	Multicast
E	240 – 255	240.0.0.1	Experimental

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✅ Types of IPv4 Addresses

1. Public IP – Unique, used on the internet.
2. Private IP – Used inside local networks (not routable on internet).
   • Ranges:
     • 10.0.0.0 – 10.255.255.255
     • 172.16.0.0 – 172.31.255.255
     • 192.168.0.0 – 192.168.255.255
3. Loopback Address – 127.0.0.1 → Used to test your own machine.

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✅ Difference Between IPv4 & IPv6 (Quick View)

Feature	IPv4	IPv6
Address Size	32-bit	128-bit
Example	192.168.1.1	2001:0db8:85a3::8a2e:0370:7334
Total Addresses	~4.3 billion	Almost unlimited
Usage	Still most common	Growing adoption

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👉 In short:

• IP Address = Unique logical address of a device.
• IPv4 = 32-bit address, written in dotted decimal, still the most widely used.