able"><code>mask-length</code></em>
       notation.  Instead of
       specifying the mask length, the actual mask is specified in a
       separate column. For example, <code class="literal">255.0.0.0</code> represents an IPv4
       CIDR mask length of 8, and <code class="literal">255.255.255.255</code> represents a
       CIDR mask length of 32.
      </p><p>
       These fields do not apply to <code class="literal">local</code> records.
      </p></dd><dt><span class="term"><em class="replaceable"><cod