SPLITTING A SUBNET

MAC_GLASGOW

Hey guys,

If you had a network address 172.168.16.0 and subnetted it to 172.168.16.0 / 20

so you have 16 subnets with 4096 hosts.

So we go up in blocks of 16.

So for example, how can I split the the following subnet (3rd octet)?

172.168.48.1 through 172.168.63.254

Thanks for the advice in advance

Danman32

Well, you're already using 20 bits for the network portion of the original subnet, so you have 12 bits left you can split into subnet/host.

So it depends on how many hosts and/or networks you need within this subnet. Just remember, the minimum number of host bits is 2, and the minimum number of network bits is either 1 if subnet 0 is allowed, or 2 if it isn't.

david_r

MAC,
If you take 172.168.48.0/20 and subnet it with one bit, you'll have 172.16.48.0/21 and 172.168.56.0/21. Is that what you are looking for?

pannupandit

well Mac,

you have already found the answer. what else u are asking for??
yeah you are right. for 3rd octet i.e. 172.168.48.0:-
tha valid no. hosts will be 172.168.48.1 to 172.168.63.254

the broadcast address will be 172.168.63.255

thanx

Pranuv