#Ip address subnet mask table series#

There are a couple intresting things about subnet masks. These numbers once again range from 0 to 255. It is made up of four eight bit numbers separated by periods. The subnet mask looks a lot like an ip address. The subnet mask specifies the range of the ip addresses in a group. Every ip address has a corresponding subnet mask. IP addresses are grouped by something called subnet mask.

#Ip address subnet mask table series#

So if you think of an ip address as a series of four eight bit numbers separated by periods, you get the following.ġ0010011.10110101.10110111.01010110 = 147.181.183.86 Simple Subnet Masks

The smallest number you could see in an ip would be a 0. Since ip addresses are made up of 8 bit numbers, the largest number you will see in an ip address is 255. Each number is an eight bit number, and in binary looks like the following. Generally it looks something like 208.155.103.158. The Form of an IP addressĮvery IP address is a series of four numbers separated by periods. Every device on the internet has an ip address. The internet works exactly the same way except on a much larger scale. That means that every printer, fax machine, scanner, copier, computer, router, and server that is on your network has an ip address. For the simplicity of this guide lets assume that every device that connects to a network has an ip address. These networks use the 255.255.255.0 subnet mask, or /24 CIDR notation.Last Updated: Febru| Reading Time: 5 minutesīefore reading this guide make sure that you understand Binary Numbers. The starting host address is 192.0.0.0 and the ending address is 223.255.255.0. These networks use the 255.255.0.0 subnet mask, or /16 CIDR notation.Ĭlass C: Allows 2 8 host addresses on the network. The starting host address is 128.0.0.0 and the ending address is 191.255.0.0. These networks use the 255.0.0.0 subnet mask, or /8 CIDR notation.Ĭlass B: Allows 2 16 host addresses on the network. The starting host address is 0.0.0.0 and the ending address is 127.0.0.0. Specific size details are defined in the following class definitions:Ĭlass A: Allows 2 24 host addresses on the network. Network classes define how many addresses are allowed on the network, with class A being the largest and class C being the smallest. The above table uses Class A, B, and C to define network types. This means that the last 8 bits of the IP address are reserved for host IP addresses, thus IP addresses 192.168.0.15 through 192.168.0.255 will be allowed as host IP addresses on the network. This means that the first 24 bits of the IP address are reserved for network routing.

192.168.0.15 defines the address prefix, and /24 defines the number of bits reserved for the netmask. To understand what CIDR notation means, take the IP address 192.168.0.15 and the /24 CIDR, for example. CIDR accomplishes the same task as traditional subnet masking. It enables network administrators to group blocks of IP addresses into single routing networks. The following table details how many networks and IP addresses are allowed with each CIDR length and equivalent subnet masks.ĬIDR stands for Classlesss Inter-Domain Routing. CIDR defines which IP addresses, and how many host IP addresses will be allowed on the network. CIDR notation accomplishes the same task as network subnet masking.