For each of these IP addresses fill in the entries.
assume classful addressing and default subnet masks.<br>
<table border="2">
<tr>
<th>
<th>class
<th>default mask
<th>prefix
<th>network address
<th>registered or<br> unregistered?
<th>broadcast address
<th>range of host addresses
<th>#hosts
<tr>
<td>192.168.100.102
<td>
<td>
<td>
<td>
<td>
<td>
<td>
<td>
<tr>
<td>192.168.0.1
<td>
<td>
<td>
<td>
<td>
<td>
<td>
<td>
<tr>
<td>111.111.111.111
<td>
<td>
<td>
<td>
<td>
<td>
<td>
<td>
<tr>
<td>151.151.151.151
<td>
<td>
<td>
<td>
<td>
<td>
<td>
<td>
<tr>
<td>222.222.222.222
<td>
<td>
<td>
<td>
<td>
<td>
<td>
<td>
<tr>
<td>1.2.3.4
<td>
<td>
<td>
<td>
<td>
<td>
<td>
<td>
<tr>
<td>192.168.50.73
<td>
<td>
<td>
<td>
<td>
<td>
<td>
<td>
<tr>
<td>172.18.0.5
<td>
<td>
<td>
<td>
<td>
<td>
<td>
<td>
<tr>
<td>10.0.0.1
<td>
<td>
<td>
<td>
<td>
<td>
<td>
<td>
</table>

<p>
here, the "class" is based/indicated by the subnet mask.  Actually, "class" only means the size
of the network.
<table border="2">
<tr>
<th>
<th>"class"
<th>subnet mask
<th>prefix
<th>network address
<th>registered or<br> unregistered?
<th>broadcast address
<th>range of host addresses
<th>#hosts
<tr>
<td>10.10.19.47
<td>
<td>255.255.255.0
<td>
<td>
<td>
<td>
<td>
<td>
<tr>
<td>172.16.0.1
<td>
<td>255.255.255.0
<td>
<td>
<td>
<td>
<td>
<td>
<tr>
<td>10.10.19.47
<td>
<td>255.255.0.0
<td>
<td>
<td>
<td>
<td>
<td>
</table>