# Subnet number line

##### *2020-01-23 21:05*

Thanks to Andy Povey for developing and providing the source code for this IP subnet calculator. This is a more straightforward and faster IP subnet calculator, giving you a complete list of information concerning an IP address and Subnet Mask, including the Network and Host address size.CIDR uses a subnet mask to show where the line is drawn between host ID and network ID. CIDR is sometimes called slash notation, or properly CIDR notation, because the subnet mask is expressed as a n behind the network address as a means to describe the subnet mask. The n in n is the number of bits used for the network ID. subnet number line

Sep 30, 2010 Classless formula is 2s (rwo to the power of s) where s is number of subnet bits used to subnet. Sometimes (in the past) you had to remove 2 from result, classful method. those remove 2 are called subnet zero and broadcast.