Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the number of networks when the size of rest bit field is 8?

### Inputs:
table_name: table, columns: ['Class', 'Leading bits', 'Size of network number bit field', 'Size of rest bit field', 'Number of networks', 'Addresses per network', 'Start address', 'End address']

### Response:
SELECT Number of networks FROM table WHERE Size of rest bit field = 8