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   <TITLE>Identifying a machine</TITLE>
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<H2>16.1 Identifying a machine</H2>
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IP (Internet Protocol) address can exist in two forms:
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<li>The familiar DNS (Domain Name Service) form. My domain name is bruceeckel.com, so suppose I have a computer called Opus in my domain. Its domain name would be Opus.bruceeckel.com. This is exactly the kind of name that you use when you send email to people, and is often incorporated into a World-Wide-Web address.</li>
<li>Alternatively, you can use the "dotted quad" form, which is four numbers separated by dots, such as 123.255.28.120.</li>
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You can get a special Java object to represent this number from either of the forms above by using the static InetAddress.getByName( ) method that's in java.net.
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Case Study:<a href=case/WhoAmI.java>WhoAmI.java</a>
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