nub subnetting question

Hey guys quick question..

I am working on sub netting faster and using subnettingquestions.com. My question...is there a faster way of solving this problem instead of going threw ALL the network address jumping by 4 each time to find the network address for the ip in question??? Currently I am looking at .0 to .4 to .8 to .16 and so on but it will take forever to get to the correct network address! any advise would be awesome. See the original problem below

Question: What is the broadcast address of the network 192.168.99.224/30?

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jmc012

VAHokie56 wrote: »

Hey guys quick question..

I am working on sub netting faster and using subnettingquestions.com. My question...is there a faster way of solving this problem instead of going threw ALL the network address jumping by 4 each time to find the network address for the ip in question??? Currently I am looking at .0 to .4 to .8 to .16 and so on but it will take forever to get to the correct network address! any advise would be awesome. See the original problem below

Question: What is the broadcast address of the network 192.168.99.224/30?

It's giving you the network address .224, a /30 is an increment of 4 so add 4 to 224 and subtract one to get the broadcast address.

mella060

A quick way to work out the answer is to find the increment / block size, what octet it is in and you are good to go.

A /30 means you have an increment of 4 in the final octet. So you know your subnets are going to go up by 4 in the last octet.

0...4...8...12...16...20...so you know that it is going to stay that way right up to 256

24...28...32...36...40

44...48...52...56...60...and so on

200...204...208...212...216...220...224...228

So you know that 192.168.99.224 /30 includes the following:

Valid host range: .225 -226

Broadcast Address: .227

Next subnet is 192.168.99.228 /30

After yoo do it for a while, this takes around 10 seconds to work out in your head.

abefroman

VAHokie56 wrote: »

Question: What is the broadcast address of the network 192.168.99.224/30?

Here is how I do it.

A /30 is 4 ips, so to make it easy count by 40's
40
80
120
160
200
240

240 was too high so go back, and count by 4.

220
224
228
-1

192.168.99.227 is your broadcast

VAHokie56

Thanks for all the quick replies. I guess I did not realize they where actually giving me the network addy from that start...my brain is running on like 6 purple mountain dews right now. Thanks again!