128/25 IP address, subnet mask and default gateway on your computers.

I need help with subnetting if anyone can explain how to configure the Ip address of for pc´s with the ip of 172.16.20.128/25

IP address, subnet mask and default gateway on your computers.

Initial network 172.16.20.128/25

Net no. Device IP number

1 PC1 Last usable

2 PC2 Last usable

3 PC3 Last usable

4 PC4 Last usable

Make sure you can ping-a between all computers.