Subnetting Question, Pls some help simple question.

SubnetNoob

Hey guys im kinda new to this stuff i have a question that i cannot answer.

130.130.0.0/23 what is the address range for subnet 100, any help is appreciated thanks.

is it 130.130.200.1 - 130.130.201.254 ?? Please any help ?

Networking_BKP

Well, the quick answer is actually 130.130.100.1 through 130.130.101.254.

I say that's the quick answer because that's technically the HOST address range, which is usually what questions like this are looking for. The full range, including the network ID and the broadcast ID is 130.130.100.0 through 130.130.101.255.

UNLESS...the question is looking for the one-hundredTH subnet's host range; which would then make your answer correct.

SubnetNoob

thx for the reply, so how exactly did you get to your answer? I realize my teacher is wording them tricky so we make a mistake giving him the 100th subnet or the ranger for subnet 100...either way could you tell me how you got your answer ? Thanks Again

emerald_octane

130.130.0.0/23

Write out the subnet in binary math and decimal:
11111111.11111111.11111110.00000000 ; 255.255.254.0

Find the 'interesting octet' in the subnet mask which is any number other than 255 or 0:
255.255.[254].0

Get the block size by using the the last subnet bit in the interesting octet:
11111111.11111111.[111111[1]0].00000000 = 2

Combine the interesting octet and the block size to get the subnets:

130.130.0.0
130.130.2.0
.......
130.130.98.0
130.130.100.0
130.130.102.0

Take the network address from above:
130.130.100.0
Take the address before the next subnet for the broadcast address:
130.130.101.255
Take the first address after the network address for the first valid host, and the address before the broadcast address for the last valid host:
130.130.100.1 - 130.130.101.254

Someone pls correct me if i'm wrong. ccent test on saturday lol.

goldenlight

Here is shortcut:: Google Dancourses and Magic number trick.. This is how I learned Subnetting really good.