#CLASS B SUBNET MASK TABLE HOW TO#

Routers arenвЂ™t concerned about host addresses. Routers use the network portion to send packets through an internetwork. If you need more information on subnetting other types of networks, take a look at Todd LammleвЂ™s other subnetting articles: вЂњSubnetting a Class B network address,вЂќ and вЂњSubnetting a Class C network address.вЂќД¬lass A subnet masks must start with 255.0.0.0 at a minimum, because the whole first octet of an IP address (the IP address describes the specific location on the network) is used to define the network portion (the network portion describes the вЂњstreetвЂќ that IP addresses are located on).

#CLASS B SUBNET MASK TABLE HOW TO#

Here, I will explain Class A subnet masks and how to assign valid subnets and host addresses to provide flexibility in configuring your network. Getting up to speed with subnetting Class A addresses requires a little forethought, some basic information, and a lot of practice. Although the Class A network has only 254 unique network addresses, it can contain approximately 17 million unique nodes, which can make subnetting such a network a nightmare. The Class A networking address scheme is designed for the government and large institutions needing a great deal of unique nodes. Here, Todd Lammle offers a simple approach to this addressing. It can have a large number of unique nodes, which can prove quite a challenge. Class A subnetting is a form of network addressing typically reserved for the government and larger institutions.

Class b subnet mask table