Subnet Mask Address

We assign a subnet mask address to every IP address. This address is used to
Define Network ID and Host ID in an IP address.
We put 255 for network ID and 0 for host id in a subnet mask address.
For Exp:
IP Addres : 50 . 0 . 0 . 1
Subnet Mask : 255 . 0 . 0 . 0
IP Addres : 130 . 0 . 0 . 25
Subnet Mask : 255 . 255 . 0 . 0
IP Addres : 215 . 0 . 0 .10
Subnet Mask : 255 . 255 . 255 .0