DEFAULT SUBNET MASK WINDOWS

The computer can now determine the size of the network. Original KB number: 164015 Summary When you configure the TCP/IP protocol on a Windows computer, the TCP/IP configuration settings require: An IP address A subnet mask A default gateway To configure TCP/IP correctly, it's necessary to understand how TCP/IP networks are addressed and divided into networks and subnetworks. In the picture above you can see that the network part of the IP address ( 10) has been determined. The first octet of Class A IP address varies from 0 to 127. The Class A default Subnet Mask is 255.0.0.0. Class A networks are vast, in which 17 million hosts or computers are connected.

Let’s say that we have the IP address of 10.0.0.1, with the default subnet mask of 255.0.0.0.įirst, we need to convert the IP address to binary: If the first part of the IP address is reserved for the network part and the remaining is for the host, it is a Class A IP address. The binary AND operation is used to determine a network range: The 1s in the subnet mask represent a network part, the 0s a host part.Ĭomputers works only with bits.

It is used by computers to determine the network part and the host part of an IP address. What does this mean? Well, just like an IP address, a subnet mask also consists of 32 bits. This is so because the default subnet mask for a class A IP address is 8 bits (or, written in dotted decimal notation, 255.0.0.0). For example, an IP address from the Class A consists of 8 network bits and 24 host bits. An IP address is divided into two parts: the network part and the host part.

Default subnet mask