# Subnetting question

Blang008
Posts:

**61**Member ■■□□□□□□□□
in CCNA & CCENT

What is the first valid host on the subnetwork that the node 192.168.145.246/28 belongs to?

I know how to find the subnet mask, increment, and network ranges. My question is: Is there a quick way to find what network range 192.168.145.246 belongs to?

I know how to find the subnet mask, increment, and network ranges. My question is: Is there a quick way to find what network range 192.168.145.246 belongs to?

0

## Comments

897MemberDetermine the block size based on the subnet mask and then count forward,

or backward in the this caseto determine the subnet, add one to determine the first available host.Quest for 11K pages read in 2011

Page Count total to date - 1283

168Member897MemberIP Subnet Practice

Quest for 11K pages read in 2011

Page Count total to date - 1283

170MemberIn this case 256 - 16.

Or 10 x 16 = 160, 5 x 16 = 80. Add the two to get 240.

Basic maths and common sense is the key.

648MemberCCNA:S

Don't be a dumper!

266MemberOk I am good at subnetting and all. I am interested in where you get the numbers. I pretty much just have it memorized, but this looks like an easy way if my brain was to fail me. LOL

933MemberSubnet block = 256 - 240 = 16

You can then determine the increments. The multiplication example is the quickest I have seen so far. If that doesn't work for you, you would have to break them down in blocks starting from:

0

16

32

48

64

80

96

112

128

144

160

176

208

224

240

From that you can then determine

192.168.145.240 is the network address 192.168.145.241 is the first host - 192.168.145.254 range 192.168.145.255 is the broadcast