Here is a helpful link I have found on the California Dept. of Insurance website. The link provides you with information on an insurance company. From the website itself:
Use a partial or full company name to search for an insurance company.
From there you will be able to access information about a company’s location, former names of the company, agent for service of process, reference information (license status, company type, state of domicile), lines of insurance the company is authorized to transact, and complaint history.
This can be very useful to you. It is a good way to check up on your insurance company!