clearer feedback when too many hosts

Instead of preventing search when the subnet is too large, restrict the search area to part of the subnet and provide feedback about which hosts are to be searched.

networkInterfaces.html

@@ -66,6 +66,12 @@
       .if-ut {
         background-color: #bf360c;
       }
+      .red {
+        color: #ca6f1e;
+      }
+      .green {
+        color: #28b463;
+      }
     </style>
   </head>
 </html>
@@ -76,7 +82,7 @@
     <th>ID</th>
     <th>IP Address</th>
     <th>Subnet Mask</th>
-    <th>Searchable Addresses</th>
+    <th>Searchable Address Ranges</th>
   </tr>
   <tbody id="network-interfaces"></tbody>
 </table>