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<chapter id="datatype">
<literal>a</> through <literal>f</>. Output is always in the
latter of the given forms.
</para>
+
+ <para>
+ The directory <filename class="directory">contrib/mac</filename>
+ in the <productname>Postgres</productname> source distribution
+ contains tools that can be used to map MAC addresses to hardware
+ manufacturer names.
+ </para>
</sect2>
</sect1>