A DUNS number (Data Universal Numbering System) is a nine-digit identification number assigned to businesses by Dun & Bradstreet (D&B), a company that provides business credit reports and other business information. If you are a business owner, you may need to provide your DUNS number in order to register for certain government contracts or grant programs, or to access certain business resources.

If you are not sure whether your business has a DUNS number or need to look up your DUNS number, here are a few steps you can follow:

1. Check with D&B: If you have previously registered with D&B, you can try contacting them to see if they can provide you with your DUNS number. You can reach out to D&B by phone or email, or through their online portal.
2. Check with the business credit reporting agencies: In addition to D&B, there are other business credit reporting agencies that may have assigned a DUNS number to your business. You can try contacting these agencies to see if they can provide you with your DUNS number.
3. Check with the government agency that requires the DUNS number: If you are required to provide a DUNS number for a specific government contract or grant program, you can try contacting the relevant agency to see if they can provide you with your DUNS number.
4. Check with your business registration documents: If you have previously registered your business with a government agency or business credit reporting agency, you may have received a DUNS number as part of the registration process. You can try checking your business registration documents to see if your DUNS number is listed.

If you are still unable to locate your DUNS number, you may need to register with D&B or another business credit reporting agency in order to obtain one.