Subnet number by using a netmask, which is a bitmask that selects the The specified part of the address becomes the subnet number. The IPv4 address as a network identifier. You can maximize the efficiency of the IPv4Īddress space by using some of the bits from the host part of You divide your IPv4 network number into subnets, you need to assign a Local networks with large numbers of hosts are sometimes divided into subnets. The opposite designation is true for a class C network. Is dedicated to the network, and the last three bytes are dedicated to For example, in a class A network address, the first byte Indicates the number of bytes that are dedicated to the host part of Number of bytes of the IPv4 address that are dedicated to the network Values for the first byte of the network number. For each class, “Range” specifies the range of decimal The following table shows the division of the standard IPv4 address into networkĪnd host address spaces. IPv4 network classes, refer to Network Classes. Space for a site with class-based network numbers. The IANA no longer gives out class-based network numbers, these network numbers are This section describes the classes into which standard IPv4 address are organized. Network prefixes are also assigned by the ISP or IR.Īn Oracle Solaris-based network can combine standard IPv4 addresses, CIDR format IPv4 addresses,ĭHCP addresses, IPv6 addresses, and private IPv4 addresses. The network prefix also provides the subnet mask for the IP address. Network prefix, which defines how many bits of the address comprise the network number. Host part, which you assign to an interface on a system. Network part, which consists of the IPv4 network number that is received from an ISP or IR. The next example shows of the CIDR format address 192.168.3.56/22įigure 2-2 CIDR Format IPv4 Address 192.168.3 If you plan to subnet a class-based IPv4 network, you need toĭefine a subnet mask, or netmask, as explained in netmasks Database. Note that for each interface on a local network, the network part of the address is the same, but the host part must be different. The host part uniquely identifies an interface on a system on a network. In class-based IPv4 notation, this number also defines the IP network class, Class B in this example, that would have been registered by the IANA. The following figure shows the component parts of an IPv4 address, 172.16.50.56. Representing the bytes of an IPv4 address is often referred to as the EachĨ-bit field represents a byte of the IPv4 address. An IPv4 address is written inĭecimal digits, divided into four 8-bit fields that are separated by periods. On a system, as explained in How IP Addresses Apply to Network Interfaces. The IPv4 address is a 32-bit number that uniquely identifies a network interface Unique IPv4 addresses for the interfaces of every system on the network. If you plan to use private addresses, the network numbers you devise must be unique within your organization. For information onĭHCP addresses, see Chapter 12, About DHCP (Overview).Įach IPv4-based network must have the following:Ī unique network number that is assigned by either an ISP, an IR, or, for older networks, registered by the IANA. For information on IPv6 addresses, see IPv6 Addressing Overview. This section gives an overview IPv4 addressing to aid you in designing an Note - For IPv6 address planning information, refer to Preparing an IPv6 Addressing Plan.
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