When submitting the FCC Form 502 a forecast is required when completing Form U1 or U2. If you do not foresee a need for additional numbering resources, complete the forecast by entering zeros for Year 1 through Year 5 on the appropriate growth forecast form (Form F1B, F2B, or F3B) in the NPA(s)/Rate Center(s) where you have resources. If you attempted to submit the forecast form, please ensure you started on the header row, row 22.  This is required for NAS to read/process the form.

The CO code holder must report on all ten thousands-blocks regardless of whether a thousands-block is assigned to, or not retained by, the reporting service provider. If the CO code holder has donated a thousands-block, then an “X” must be indicated in the “Donated to Pool” column on the U1 form. If you do not report on all ten thousands-blocks, the CO code (NPA-NXX) will remain on the UMR.

If you have geographic numbering resources i.e., CO codes and thousands-blocks assigned to your OCN within the U.S and U.S. territories, then you complete the geographic FCC Form 502. If you have non-geographic numbering resources i.e., 5XX-NXX/9YY-NXX numbering resources assigned to your OCN then you complete the non-geographic FCC Form 502.

The file date must not be greater than or less than one day from the date of transmission.

When uploading the NRUF FCC Form 502 in NAS, the file naming convention must be OCN.MMDDYYYY.NRUFGEO.xlsm or OCN.MMDDYYYY.NRUFGEO.xlsx for the Geographic (CO Code and Thousands-Block Resources) NRUF FCC Form 502 and OCN.MMDDYYYY.NRUFNONGEO.xlsm or OCN.MMDDYYYY.NRUFNONGEO.xlsx for the Non-Geographic (5XX/9YY Resources) NRUF FCC Form 502. 

NOTE: The file extension .xlsm or .xlsx does not need to be typed.  The extension is added when saved and should not be included more than once, e.g., OCN.MMDDYYY.NRUFGEO.xlsm.xlsm.

There are three submission methods supported by NAS: REST API interface (Application Programming Interface), SFTP interface (Secure File Transfer Protocol) and web-based User Interface.

All carriers that receive numbering resources from NANPA, must report utilization and forecast data. In addition, carriers that receive intermediate numbers must report utilization data for such numbers in their inventories.

All reporting carriers must submit an NRUF FCC Form 502 semi-annually, on or before February 1 for the reporting period ending on December 31, and on or before August 1 for the reporting period ending on June 30.