Ip Addresses Classes and Special-Use Ip Address Space

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IP Addresses Classes and Special-Use IP Address Space

To provide the flexibility required to support networks of varying sizes, Internet designers decided that the IP address space should be divided into three address classes-Class A, Class B, and Class C. This is often referred to as classful addressing. Each class fixes the boundary between the network prefix and the host number at a different point within the 32-bit address. One of the fundamental features of classful IP addressing is that each address contains a self-encoding key that identifies the dividing point between the network prefix and the host number.

Network Address Classes Address Class | Octets Used | First Network ID | Last Network ID | Number of Networks | Class A | 1 | 1.x.y.z | 126.x.y.z | 126 | Class B | 2 | 128.0.y.z[*] | 191.255.y.z | 16,384 | Class C | 3 | 192.0.0.z | 223.255.255.z | 2,097152 |

Host Address Classes Address Class | Octets Used | First Host ID | Last Host ID | Number of Hosts | Class A | 3 | w.0.0.1 | w.255.255.254 | 16,777,214 | Class B | 2 | w.x.0.1 | w.x.255.254 | 65,534 | Class C | 1 | w.x.y.1 | w.x.y.254 | 254 |

Class D is reserved for IP multicast addresses. The first four high-order bits are set to 1110. The remaining 28 bits are used for individual IP multicast addresses. Multicast Backbone on the Internet (MBONE) is an extension to the Internet that supports IP multicasts and uses Class D addresses. MBONE allows a single packet to have multiple destinations and is most often used in real-time audio and video applications. (Shimonski, Robert & Alpern, Naomi. ( © 2009). Comptia network+ certification study guide. [Books24x7 version] Available from http://common.books24x7.com.proxy.itt-tech.edu/toc.aspx?bookid=37164.)
RFC1918 describes a set of network ranges set aside for so-called "private" use. These IP addresses can…...

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