HP (Hewlett-Packard) 600N ユーザーズマニュアル

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TCP/IP Overview 133
IP Address: (Network Portion)
Network addresses are managed by an organization in Norfolk, 
Virginia recognized as InterNIC. InterNIC has been contracted by 
the National Science Foundation to manage the Internet addresses 
and domains. Network addresses are distributed to organizations 
that are in turn responsible for making sure all attached devices or 
hosts on the network are properly numbered. The network address 
is a four-byte address although some bytes may be expressed 
as zeros.
IP Address: (Host Portion)
Host addresses numerically identify specific network interfaces on 
an IP network. Usually a host has only one network interface; thus, 
only one IP address. Because no two devices can share the same 
number at the same time, administrators typically maintain 
address tables to assure correct assignment of addresses in the 
host network.