Subnet mask

Hi,
I'm still really confuse with the subnet mask
What I don't understand is why some Network admin use the 3rd byte from the subnet instead of 2nd byte (look at the 24

it should be at the 2nd byte or?

eg:

62.161.99.115
255.255.248.0

Thanks for your help

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EdTheLad

Karimbruxelles wrote:

Hi,
I'm still really confuse with the subnet mask
What I don't understand is why some Network admin use the 3rd byte from the subnet instead of 2nd byte (look at the 24 it should be at the 2nd byte or?

eg:

62.161.99.115
255.255.248.0

Thanks for your help

Why dont you read a book?This forum is full of info regarding subneting.
The mask is important when deciding how many hosts you want to support on your network.

nothing_pt

Karimbruxelles wrote:

Hi,
I'm still really confuse with the subnet mask
What I don't understand is why some Network admin use the 3rd byte from the subnet instead of 2nd byte (look at the 24 it should be at the 2nd byte or?

eg:

62.161.99.115
255.255.248.0

Thanks for your help

By the way the 2nd byte is used as well. That is a Class A address with 13 bits borrowed from the host portion, allowing for 8190 subnets with 2046 hosts each. That's the purpose of subnetting, a better use of address space and improve future scalability.