# Subnetting: first address, last address and host range

Subject: Computer Networks

Exam: M2

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

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

Unit 4 · masks, subnetting and CIDR

1. [One method for every ordinary IPv4 block question](https://deep-learning-study-room.vercel.app/read/cn/m2/read/subnets--method/)
2. [Complete block · 192.168.10.77/26](https://deep-learning-study-room.vercel.app/read/cn/m2/read/subnets--block-1/)
3. [Complete block · 200.140.64.48/26](https://deep-learning-study-room.vercel.app/read/cn/m2/read/subnets--block-2/)
4. [Complete block · 193.20.35.40/26](https://deep-learning-study-room.vercel.app/read/cn/m2/read/subnets--block-3/)
5. [Complete block · 192.168.1.150/27](https://deep-learning-study-room.vercel.app/read/cn/m2/read/subnets--block-4/)
6. [Complete block · 10.4.9.55/28](https://deep-learning-study-room.vercel.app/read/cn/m2/read/subnets--block-5/)
7. [Complete block · 172.16.35.123/20](https://deep-learning-study-room.vercel.app/read/cn/m2/read/subnets--block-6/)
8. [Complete block · 10.20.5.130/23](https://deep-learning-study-room.vercel.app/read/cn/m2/read/subnets--block-7/)
9. [Complete block · 192.168.2.129/25](https://deep-learning-study-room.vercel.app/read/cn/m2/read/subnets--block-8/)
10. [Complete block · 192.0.2.6/30](https://deep-learning-study-room.vercel.app/read/cn/m2/read/subnets--block-9/)
11. [Why /31 and /32 do not use the ordinary minus-two rule](https://deep-learning-study-room.vercel.app/read/cn/m2/read/subnets--exceptions/)
12. [Hosts to prefix · 25 hosts](https://deep-learning-study-room.vercel.app/read/cn/m2/read/subnets--hosts-1/)
13. [Hosts to prefix · 64 hosts](https://deep-learning-study-room.vercel.app/read/cn/m2/read/subnets--hosts-2/)
14. [Hosts to prefix · 1000 hosts](https://deep-learning-study-room.vercel.app/read/cn/m2/read/subnets--hosts-3/)
15. [Equal-size subnet design · example 1](https://deep-learning-study-room.vercel.app/read/cn/m2/read/subnets--split-1/)
16. [Equal-size subnet design · example 2](https://deep-learning-study-room.vercel.app/read/cn/m2/read/subnets--split-2/)
17. [Equal-size subnet design · example 3](https://deep-learning-study-room.vercel.app/read/cn/m2/read/subnets--split-3/)