Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Class | Leading bits | Size of network number bit field | Size of rest bit field | Number of networks | Addresses per network | Start address | End address |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Class A | 0.0 | 8 | 24 | 128 (2 7 ) | 16,777,216 (2 24 ) | 0.0.0.0 | 127.255.255.255 |
| Class B | 10.0 | 16 | 16 | 16,384 (2 14 ) | 65,536 (2 16 ) | 128.0.0.0 | 191.255.255.255 |
| Class C | 110.0 | 24 | 8 | 2,097,152 (2 21 ) | 256 (2 8 ) | 192.0.0.0 | 223.255.255.255 |
| Class D ( multicast ) | 1110.0 | not defined | not defined | not defined | not defined | 224.0.0.0 | 239.255.255.255 |
| Class E (reserved) | 1111.0 | not defined | not defined | not defined | not defined | 240.0.0.0 | 255.255.255.255 |
Question:
What is the number of networks when the size of rest bit field is 8?
Answer:
2,097,152 (2 21 )