How Many Subnets/Hosts Speed Practice 2

It’s Friday, and time for some subnetting practice. Today we’ll do another round on figuring out the number of subnets in a network, and the number of hosts per subnet.
Suggestions BEFORE CLICKING to see the rest: be ready to start your timer. Be ready to finish all 5 problems.
Your job: Based on a class A, B, or C network number, and a mask, with the assumption that the mask is used for all subnets in the network
- List the number of subnets that exist
- List the number of usable host IP addresses per subnet
You may assume that the zero and broadcast subnets are usable.
Ready… steady… go!
1) 9.0.0.0/22
2) 100.0.0.0/9
3) 151.151.0.0/24
4) 201.201.201.0/29
5) 223.223.221.0/28
Want more? Just click here, or to do the same thing, pick the Subnet Speed category on the right side of the page.
.
.
.
.
.
.
1m42s!
20 sec each – perfect. Woohoo!
2.18
4:01