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IP addressing is divided into five "classes" of addresses The address range of the network portion of the address determines the class, and the remainder of the address is for hosts Therefore, when you have few networks, you can have many hosts, and vice versa IP classes are identified by the values of the first five bits of the first octet, as demonstrated in Table 3-1 Table 3-1: Number of Hosts and Networks for the IP Address Classes
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Address Class 1st Octet
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Range of Numbers
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Number of Hosts
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Number of Networks
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A B C
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0xxxxxxx 10xxxxxx 110xxxxx
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0 127 128 191 192 223
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16,777,214 5,534 254
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126 16,384 2,097,152
Class A addresses contain a 0 in their first bit and a smaller number of bits for networks and, therefore, accommodate a smaller number of possible networks but a very large number of possible hosts in each network These addresses are reserved for very large sites with a huge number of hosts Class B addresses contain a 1 in their first bit, and a larger number of network numbers are available, with a fewer number of hosts in each network as compared to Class A addresses Class B addresses are used in networks with a large number of sites that have a large number of hosts at each site Class C addresses have a 1 in the first two bits of their addresses They offer a very large number of network numbers, but fewer hosts in each network These addresses are used in smaller sites that have fewer hosts on each network All these address classes are analyzed in Table 3-1
IP Addressing by the Numbers
The address ranges are represented by the value of the first octet, although the numbers of networks and hosts are determined by the entire number of bits included in the network and host portion of that address, for each particular address class By default, Class A addresses, for example, use only the first octet for network numbers Class B addresses include the first two octets as part of the network address Class C addresses include the first three octets as part of the network address, leaving only the fourth and last octet for host addresses
Subnetting
The dividing line between networks and hosts is really determined by the subnet maskSubnetting is used as a way to divide the hosts' portion of an IP address into separate "subnetworks," with a smaller number of hosts assigned to each subnet This gives the IP address administrator more flexibility in determining the distribution of network assignments and host assignments within the IP address assigned from the InterNetwork Information Center (InterNIC) The InterNIC controls the assignment of all IP addresses available This ensures a unique address for everyone using IP addresses for communicating with other TCP/IP entities The Internet is a perfect example of this, although intercorporate communication via alternate pathways is becoming more prevalent IP address subnetting is accomplished through the use of the subnet mask A subnet mask is a 32bit binary number that is compared with the IP address using the logical AND function to determine which bits of the IP address are part of the IP subnet A subnet mask essentially answers the simple question the computer or router wants to know: "What part of the address is the network " A subnet mask places a 1 in the bits that are for the network That is, if the computer sees a subnet mask of 11111111111111110000000000000000 then the computer knows that the first two octets determine the network and the last two are for the host This bit mask is equivalent to 25525500 Here are the default subnet masks for each major class:
Class A Class B Class C
255000 25525500 2552552550
By increasing the subnet mask, an administrator can increase the addressing space for networks (thus increasing the number of networks available for use), while decreasing the numbers available for hosts The example in Table 3-2 shows a Class B IP address that is using a subnet mask to increase the number of available subnetworks Table 3-2: Subnet Masks Increase the Number of Available Hosts
Subnet Mask (Dotted Decimal)
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