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<TITLE>Getting the Hostname of an IP Address (Java Developers Almanac Example)
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        <B><A HREF="../java.net/pkg.html#Hostnames and IP Addresses">Hostnames and IP Addresses</A></B><font color="#666666" class="xsmall-font">
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  <h3>e145. Getting the Hostname of an IP Address</h3>

This example attempts to retrieve the hostname for an IP address.
Note that <code>getHostName()</code> may not succeed, in which case it simply
returns the IP address.


<pre>    try {
        // Get hostname by textual representation of IP address
        InetAddress addr = InetAddress.getByName(<font color="#0066ff"><i>"127.0.0.1"</i></font>);
    
        // Get hostname by a byte array containing the IP address
        byte[] ipAddr = new byte[]{<font color="#0066ff"><i>127</i></font>, <font color="#0066ff"><i>0</i></font>, <font color="#0066ff"><i>0</i></font>, <font color="#0066ff"><i>1</i></font>};
        addr = InetAddress.getByAddress(ipAddr);
    
        // Get the host name
        String hostname = addr.getHostName();
    
        // Get canonical host name
        String hostnameCanonical = addr.getCanonicalHostName();
    } catch (UnknownHostException e) {
    }
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            &nbsp;<b>Related Examples</b></font></td>
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e144. <a class="eglink" href="ResolveHostname.html?l=rel">
    Getting the IP Address of a Hostname
</a>
<br>

e146. <a class="eglink" href="Local.html?l=rel">
    Getting the IP Address and Hostname of the Local Machine
</a>
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