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

### Instruction:
What is the start address when the network number bit field is 16?

### 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 Start address FROM table WHERE Size of network number bit field = 16