Question regarding 4subnets and identifying the Network ID - MSCA Exam

Hello,
I have this question for my MSCA 2012 and i can't figure it out :
Subnet1  50hosts
Subnet2 110hosts
Subnet3 400hosts
Subnet4 525hosts
My answers :
10.10.1.0/26
10.10.16.0/25
10.10.128.0/23
10.10.8.0/22
Set the network ID next to the 4 subnets.
I don't understand how to start from this ... I mean /26 etc :(
Can someone explain in detail pls.

Hi,
What is the IP range for subnetting? According to your answers, it seems to be fine since on duplicated IP addresses in each subnet and the network masks are correct. As we all known, the number of host bits being used for subnetting determines the possible
number of subnets and hosts per subnet. Since you need 50(30<50<62) hosts in subnet1, you need 6 bits for host bits and the subnet mask is /26. Maybe you can refer to the link below to better understand subnetting:
Subnetting
Best regards,
Susie

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