Subnetting a subnet --sunny way

Subnetting playlist includes 5 examples of subnetting.
https://www.youtube.com/watch?v=ecCuyq-Wprc&list=PLSNNzog5eydueOR_p6dezKr2tosjGvdNH

1. Subnetting is Simple
2. Subnetting a subnet - Sunny way
3. Class B ID subnetting
4. VLSM subnetting - CompTIA Network + Simulation Question & Solution
5. VLSM Subnetting - subnetting a subnet
Subnetting a subnet is similar to subnetting. Compared to subnetting, subnetting a subnet takes only one more step to find the column we need in the Sunny table. Once we identify the column, the rest of the subnetting process is exactly the same.

The example used in the video.

You are given a single network ID 125.23.200.64/26, and you are asked to set up three separate subnets for 3 different departments sharing a building. Your task is to list each new subnet’s network ID, new subnet mask, Host ID Range, # of usable host IDs, and Broadcast ID.

Practice question:

You are given a single network ID 125.23.200.128/25, and you are asked to set up three separate subnets for 3 different departments. Your task is to list each new subnet’s network ID, new subnet mask, Host ID Range, # of usable host IDs, and Broadcast ID.

Answer for your reference (you can choose three out of four subnets. One is wasted.)
#1: 125.23.200.128/27, 129 - 158, 30, 125.23.200.159
#2: 125.23.200.160/27, 161 - 190, 30, 125.23.200.191
#3: 125.23.200.192/27, 193- 222, 30, 125.23.200.223
#4: 125.23.200.224/27, 225 - 254, 30, 125.23.200.255
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Видео Subnetting a subnet --sunny way канала Sunny Classroom