# IPv4: understand the address before subnetting

Subject: Computer Networks

Exam: M2

Reader: https://deep-learning-study-room.vercel.app/cn/#m2/read/ipv4

Canonical: https://deep-learning-study-room.vercel.app/read/cn/m2/read-chapter/ipv4/

Unit 4 · IPv4 addressing

1. [IPv4 addresses: four octets, one 32-bit value](https://deep-learning-study-room.vercel.app/read/cn/m2/read/ipv4--structure/)
2. [Classful addressing: historical default boundaries](https://deep-learning-study-room.vercel.app/read/cn/m2/read/ipv4--classes/)
3. [Private, loopback and special IPv4 addresses](https://deep-learning-study-room.vercel.app/read/cn/m2/read/ipv4--special/)
4. [Subnet masks: 1 keeps a network bit; 0 marks a host bit](https://deep-learning-study-room.vercel.app/read/cn/m2/read/ipv4--mask/)
5. [Prefix to mask · example 1](https://deep-learning-study-room.vercel.app/read/cn/m2/read/ipv4--mask-1/)
6. [Prefix to mask · example 2](https://deep-learning-study-room.vercel.app/read/cn/m2/read/ipv4--mask-2/)
7. [Prefix to mask · example 3](https://deep-learning-study-room.vercel.app/read/cn/m2/read/ipv4--mask-3/)
8. [Prefix to mask · example 4](https://deep-learning-study-room.vercel.app/read/cn/m2/read/ipv4--mask-4/)