To indicate the network identifier, a (Managed web hosting) CIDR IP
To indicate the network identifier, a CIDR IP address is followed by a slash (/) and then a number from 13 to 27. A smaller number indicates a network containing more hosts. Here is an example of an IP address that uses the CIDR notation: 128.8.27.18/16 In this example, the first 16 bits (128.8) represent the network number and the remainder (27.18) represent the specific host number. This network number can contain up to 65,536 hosts (the same as a class B address). The following list shows how many hosts can be represented in networks using different numbers to identify the network: /13 524,288 hosts /14 262,144 hosts /15 131,072 hosts /16 65,536 hosts /17 32,768 hosts /18 16,382 hosts /19 8,192 hosts /20 4,096 hosts /21 2,048 hosts /22 1,024 hosts /23 512 hosts /24 256 hosts /25 128 hosts /26 64 hosts /27 32 hosts The CIDR addressing scheme also helps reduce the routing overload problem by having a single, high-level route represent many lower level routes. For example, an Internet service provider could be assigned a single /13 IP network and assign the 500,000-plus addresses to its customers. Routers outside the ISP would only need to know how to reach the ISP for those half-million addresses. The ISP would then be responsible for maintaining routing information for all of the host routes with that network address. Getting IP addresses So, what is the impact of assigning IP addresses for the computers on your LAN? How you choose which IP addresses to use depends on your situation. If you are part of a large organization, you should get addresses from the network administrator of your organization. Even if you don t connect to other LANs in your organization, having unique addresses can make it easier to connect to other LANs in the future. If you are setting up a network for yourself (with no other networks to consider in your organization), use private addresses or (if you need the network to be part of the Internet) apply for your own domain name and IP addresses. (You can get unique IP addresses and domain names from Network Solutions at http://www.networksolutions.com/ or, more likely, from your Internet Service Provider.) If you don t need to have your LAN accessible from the Internet, choose IP addresses from the set of available general-purpose IP addresses. (Using these private IP addresses, you can still access the Internet from your LAN for such things as Web browsing and accessing e-mail by using a feature described in Chapter 16 called IP masquerading.) Table 15-1 lists the private IP addresses not used on any public part of the Internet. Table 15-1: Private IP Addresses Network Class Network Numbers Addresses per Network Number Class A 10.0.0.0 167,777,216 Class B 172.16.0.0 to 172.31.0.0 65,536
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