we ran OUT of IP Addresses!!

Summary by Krater

This video explains the history and structure of IPv4 addresses, detailing how classes A, B, and C are organized using subnet masks and why they were allocated inefficiently.

From the video

Answers: How do IP address classes and subnet masks work?

• IPv4 address classes
• Subnet masks
• Classful vs classless networking
• Loopback addresses
• Network troubleshooting

What it concludes

• Class A networks provide over 16 million host addresses but only 126 networks exist, causing severe allocation inefficiency.
• Class D IP addresses are reserved for multi-cast and cannot be used normally.
• Class E IP addresses are experimental and cannot be used.
• The 127.0.0.0 range is missing from standard allocation and is used as loopback addresses for network testing.