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_46698 ( "Class" text, "Leading bits" real, "Size of network number bit field" text, "Size of rest bit field" text, "Number of networks" text, "Addresses per network" text, "Start address" text, "End address" text )

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

### Accurate SQL ###

SELECT "Number of networks" FROM table_46698 WHERE "Size of rest bit field" = '8'