If you obtained your certification through an online agency, retrieving your certification number will be very simple. First you have to find the name of the agency that gave the class, and then follow through on the prompts. Most sites will only require you to provide them with your first and last name and then a date of birth. Some sites will require you to provide them with your social security number, but be cautious of the site's security measures before proceeding.
Once you have given your information, you will either be asked if you need a replacement card or certificate or in some cases a printable certificate will be accessible, giving you the certificate with your name and certification number.
You may also request to retake the test or a refresher course to update your certification. If you choose this option, then your certification number will change and a new card and certificate will be issued to you.
If you have to obtain your certification number from an agency prior to the dates above, then you may have to wait a while for your request to be fulfilled. This process will be lengthy and requires nothing more than patience.
Make sure you have the first and last name correct with the date of birth.
You may need to provide the agency with a social security number for extra security measures. Most requests will be fulfilled through the mail with a replacement card and certificate.