Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_88 ( start_address VARCHAR, size_of_network_number_bit_field VARCHAR )

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

### Accurate SQL ###

SELECT start_address FROM table_name_88 WHERE size_of_network_number_bit_field = "16"