Subnetting and router ip addresses

[carl_townshend]

Hello all

Can someone tell me if you can have a network of e.g 172.19.55.0 with a mask of 255.255.252.0

Also when subnetting what ip address would you put your router on and what mask, would it have to be in the range you applied and the same mask ?

thanks all

[kumarapalani]

Yes that should be fine for a network address of 172.19.52/22 . Usually the router is assigne the first usalable address in that network, but depends on how u want to implement.

[ankurbhasin]

Hi Carl,

172.19.55.0 with a mask of 255.255.252.0 cannot be a network address as it is a broadcast address for the subnet 172.19.52.0.

Yes if you want you can have a network address like

172.19.53.x or 172.19.54.x with same mask.

If you choose this mask with 172 range ip address you are already subnetting and you can have ip like 172.16.54.1 255.255.252 for your router interface. It should be in same range of your subnet.

HTH

Ankur

[Kevin Dorrell]

If you have a mask 252, then the corresponding octet must be a multiple of 4 to make a network address. For example 172.19.48.0, 172.19.52.0, 172.19.56.0 etc are all valid subnet addresses.

The address 172.19.55.0 would be seen as a host address within the 172.19.52.0/22 subnet. The subnet goes from 172.19.52.0 to 172.19.55.255, but the first address (172.19.52.0) is the address if the subnet itself, and the last (172.19.55.255) is the directed broadcast address. Anything between is valid as a host address. You can put your router on any of those valid host addresses, as long as you get the mask right.

Kevin Dorrell

Luxembourg