![]() There are two other networks that are not commonly used, class D and Class E.Ĭlass D has its highest bit order set to 1-1-1-0 it is used to support multicasting.Ĭlass E has its highest bit order set to 1-1-1-1 which is reserved for experimental use. The entire class C network represents 2 29 (536,870,912) addresses therefore it is only 12.5 % of the total IPv4. Subnet 1 We start with 192.168.1.0 and the subnet mask is 255.255.255.128: Network address: The network address has all host bits set to 0 so that’s why it is 192.168.1. And each network supports up to 254 (2 8 -2) hosts. This class defines a maximum of 2,097,152 (2 21 ) /24 networks. It is a 21-bit network number with 8-bit host number. This is a 24-bit network prefix it has a 3 bit set to the highest order 1-1-0. Class B /16 block address is (1,073,741,824) = 2 30 therefore it represent 25% of the total IPV4. This class defines 16,384 (2 14 ) /16 networks, and supports a maximum of 65,534 (2 16 -2) hosts per network. It is a 14-bit network number with a 16-bit host number. This network is a 16-bit network prefix its highest bit order is set to 1-0. The IPv4 address space contains a maximum of 2 32 power (4,294,967,296) addresses, which mean that a class A network address space is 50% of the total IPv4 unicast, address space. The class A network address block contains 2 31 power (2,147,483,648) individual addresses. You must subtract two because the base network represents host “0”, and the last host on the network is actually used for 1s (“broadcast”) and may not be assigned to any host. Each network supports a maximum of 16,777,214 (2 24 -2) hosts per network. Its highest bit is set to 0, and contains a 7-bit network number and a 24-bit host number.Ī maximum of 126, which is (2 7 -2,) networks can be defined two is subtracted because all an (0 and 1) subnet cannot be used in certain routers using RIP-1 Protocol. The next section explains how networks can be divided using subnet masks. In some scenarios, the default subnet mask values do not fit the needs of the organization, because of the physical topology of the network, or because the numbers of networks (or hosts) do not fit within the default subnet mask restrictions. Its first octet is 192, which is between 192 and 223, inclusive. Class C networks use a default subnet mask of 255.255.255.0 and have 192-223 as their first octet.Its first octet is 172, which is between 128 and 191, inclusive. The address 172.16.52.63 is a class B address. Class B networks use a default subnet mask of 255.255.0.0 and have 128-191 as their first octet. Class A Default Network Mask: 255.0.0.0 is known by its first byte ruling, which will be able to locate all the Networks that fall at the first byte.Its first octet is 10, which is between 1 and 126, inclusive. The address 10.52.36.11 is a class A address. Class A networks use a default subnet mask of 255.0.0.0 and have 0-127 as their first octet.Following are the ranges of Class A, B, and C Internet addresses, each with an example address: You can identify the class of an IP address by looking at its first octet. Each of the address classes has a different default subnet mask. Classes D and E exist, but are not generally used by end users. The most common of these are classes A, B, and C. ![]() These IP addresses are divided into classes. Internet addresses are allocated by the InterNIC ( ), the organization that administers the Internet. ![]() One part identifies the host (computer), the other part identifies the network to which it belongs.Govt. The following diagram modifies the above example by moving 2 bits from the host part to the network prefix to form four smaller subnets each one-quarter of the previous size.Ī subnet mask is used to divide an IP address into two parts. ![]() This divides a network into smaller subnets. Subnetting is the process of designating some high-order bits from the host part as part of the network prefix and adjusting the subnet mask appropriately. ![]()
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