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Unformatted text preview: ange A 0.0.0.0 to 127.255.255.255 B 184.108.40.206 to 220.127.116.11 C 192.0.0.0 to 18.104.22.168 D 22.214.171.124 to 126.96.36.199 E 240.0.0.0 to 247.255.255.255 Figure 1.6 Ranges for different classes of IP addresses.
It is worth reiterating that a multihomed host will have multiple IP addresses: one per interface.
Since every interface on an internet must have a unique IP address, there must be one central
authority for allocating these addresses for networks connected to the worldwide Internet. That
authority is the Internet Network Information Center, called the InterNIC. The InterNIC assigns
only network IDs. The assignment of host IDs is up to the system administrator.
Registration services for the Internet (IP addresses and DNS domain names) used to be handled by the NIC, at
nic.ddn.mil. On April 1, 1993, the InterNIC was created. Now the NIC handles these requests only for the
Defense Data Network (DDN). All other Internet users now use the InterNIC registration services, at
There are actually three parts to the InterNIC: registration services (rs.internic.net), directory and
database services (ds.internic.net), and information services (is.internic.net). See Exercise 1.8
for additional information on the InterNIC. There are three types of IP addresses: unicast (destined for a single host), broadcast (destined
for all hosts on a given network), and multicast (destined for a set of hosts that belong to a
multicast group). Chapters 12 and 13 look at broadcasting and multicasting in more detail.
In Section 3.4 we'll extend our description of IP addresses to include subnetting, after describing file:///D|/Documents%20and%20Settings/bigini/Docu...homenet2run/tcpip/tcp-ip-illustrated/introduc.htm (8 of 20) [12/09/2001 14.46.31] Chapter 1. Introduction IP routing. Figure 3.9 shows the special case IP addresses: host IDs and network IDs of all zero
bits or all one bits. 1.5 The Domain Name System
Although the network interfaces on a host, and therefore the host itself, are known by IP...
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- Spring '12