FDA注册分企业注册和产品注册，产品注册好了会立刻下发产品注册号，即Device Number，但是企业注册好了FDA只会先下发Owner Number，企业注册号（Registration Number）需要等待至少90天以上，FDA系统才会自动下发，当然了这个企业注册号不会影响任何出口。详细见如下FDA官方正式回复：
It may take up to 90 days or more for your registration number to be assigned.
Your registration information has been forwarded to the Division of Field Investigations (for foreign establishments) or to the District Office in your area (for domestic establishments) for assignment of your registration number. They are currently working on assigning these numbers. Once your registration number is assigned, we will send an email to the official correspondent and owner/operator informing them of the registration number. You can also check to see if your registration number has been assigned by logging into your FURLS account and selecting “View Your Registration and Listing Information” from the Device Registration and Listing Main Menu.
Until the registration number is received, you may conduct business using your owner/operator and listing numbers.