Variable subnetting mask help
Posted on 2005-05-13
I have class b address of 188.8.131.52/255.255.0.0 and one of the techicians came up with the following:
1st floor = 184.108.40.206 - 220.127.116.11/255.255.255.0 (max host/subnet 254). Additional subnets requiring a mask of 255.255.255.0 = 18.104.22.168 - 22.214.171.124
2nd floor = 126.96.36.199 - 188.8.131.52/255.255.255.128 (max host/subnet 126). Additional subnets requiring a mask of 255.255.255.128 = 184.108.40.206 - 220.127.116.11
I know that he subnetted the orginal class B address using VSLM. However, what i don't understand is this. The 1st floor subnet mask should give me:
11111111.11111111.11111111.X and the third octet should allow me the following: 00000001 - 11111110 in subnets. So the available subnets should be from 18.104.22.168 to 22.214.171.124 for the first floor. Why is it to .31 only?
As for second floor, the subnet mask produces the following 11111111.11111111.11111111.10000000. How does he end up with a subnet begin .32?
Can someone explain this to me? I am confused