| ubnet | Hosts | Addresses | Bits Required | Netmask         | CIDR Netmask |
| ----- | ----- | --------- | ------------- | --------------- | ------------ |
| A     | 23    | 25        | 5             | 255.255.255.224 | /27          |
| B     | 4     | 6         | 3             | 255.255.255.248 | /29          |
| C     | 18    | 20        | 5             | 255.255.255.224 | /27          |
| D     | 31    | 33        | 6             | 255.255.255.192 | /26          |
| E     | 73    | 75        | 7             | 225.255.255.128 | /25          |
Subnet E: 66.77.88.0/25
Range: 66.77.88.1 - 66.77.88.126
Broadcast: 66.77.88.127
"Last" IP: 66.77.88.1

Subnet D: 66.77.88.128/26
Range: 66.77.88.129 - 66.77.88.190
Broadcast: 66.77.88.191
"Last" IP: 66.77.88.129

Subnet A: 66.77.88.192/27
Range: 66.77.88.193 - 66.77.88.222
Broadcast: 66.77.88.223
"Last" IP: 66.77.88.193

Subnet C: 66.77.88.224/27
Range: 66.77.88.225 - 66.77.88.254
Broadcast: 66.77.88.255
"Last" IP: 66.77.88.225

Subnet B: 66.77.89.0/29
Range: 66.77.89.1 - 66.77.89.7
Broadcast: 66.77.89.8
"Last" IP: 66.77.89.7
Broadcast: 66.77.88.127
"Last" IP: 66.77.88.1

Subnet D: 66.77.88.128/26
Range: 66.77.88.129 - 66.77.88.190
Broadcast: 66.77.88.191
"Last" IP: 66.77.88.129

Subnet A: 66.77.88.192/27
Range: 66.77.88.193 - 66.77.88.222
Broadcast: 66.77.88.223
"Last" IP: 66.77.88.193

Subnet C: 66.77.88.224/27
Range: 66.77.88.225 - 66.77.88.254
Broadcast: 66.77.88.255
"Last" IP: 66.77.88.225

Subnet B: 66.77.89.0/29
Range: 66.77.89.1 - 66.77.89.7
Broadcast: 66.77.89.8
"Last" IP: 66.77.Broadcast: 66.77.88.127
"Last" IP: 66.77.88.1

Subnet D: 66.77.88.128/26
Range: 66.77.88.129 - 66.77.88.190
Broadcast: 66.77.88.191
"Last" IP: 66.77.88.129

Subnet A: 66.77.88.192/27
Range: 66.77.88.193 - 66.77.88.222
Broadcast: 66.77.88.223
"Last" IP: 66.77.88.193

Subnet C: 66.77.88.224/27
Range: 66.77.88.225 - 66.77.88.254
Broadcast: 66.77.88.255
"Last" IP: 66.77.88.225

Subnet B: 66.77.89.0/29
Range: 66.77.89.1 - 66.77.89.7
Broadcast: 66.77.89.8
"Last" IP: 66.77.89.7

Internet Connected Router = Y

Network
Network Number
Default Route
A
66.77.88.128/26
66.77.88.129
B
66.77.89.0/29
66.77.89.1
C
66.77.88.224/27
66.77.88.225
D
66.77.88.128/26
66.77.88.128
E
66.77.88.0/25
66.77.88.189.7

Internet Connected Router =Y

Network
Network Number
Default Route
A
66.77.88.128/26
66.77.88.129
B
66.77.89.0/29
66.77.89.1
C
66.77.88.224/27
66.77.88.225
D
66.77.88.128/26
66.77.88.128
E
66.77.88.0/25
66.77.88.1
Internet Connected Router = Y

| Network | Network Number  | Default Route |
| ------- | --------------- | ------------- |
| A       | 66.77.88.128/26 | 66.77.88.129  |
| B       | 66.77.89.0/29   | 66.77.89.1    |
| C       | 66.77.88.224/27 | 66.77.88.225  |
| D       | 66.77.88.128/26 | 66.77.88.128  |
| E       | 66.77.88.0/25   | 66.77.88.1    |