Central Office Code Reports

Below are reports and other information concerning Central Office code administration.


  • Central Office Code Availability Report - Provides an up-to-date list of central office codes available for assignment by NPA. Updated real-time.

    Effective May 19, 2007, pooling set-aside codes are now included on the list of available codes.
  • Central Office Code Utilized Report - Provides an up-to-date list of central office codes assigned or unavailable for assignment by NPA. Updated real-time.

    Effective May 19, 2007, pooling set-aside codes have been removed from the list of utilized codes.
  • Central Office Code Assignment Records - Provides an updated listing of assigned, available and unavailable central office codes by NPA in a downloadable format. Updated daily.

    Effective May 19, 2007, pooling set-aside codes appearing in the Text file are now included in the list of available codes rather than the list of utilized codes. For the Excel files, pooling set aside codes appear as available for assignment.
  • Central Office Code Assignment Activity Records - Provides the Central Office Code assignment activity for each NPA. Updated monthly.

    Effective with the May 2007 report, the quantity of pooling set aside codes are included in the total quantity of "available" codes rather than the total quantity of "unavailable" codes.
  • List of Codes requiring Special Handling - A list of NPA-NXX codes that require special handling due to unique circumstances (e.g., grandfathered codes, codes impacted by a state regulatory direction, defined assignment practices). The code holder should contact NANPA before attempting to make a change or return of these codes. [NOTE: This link was previously named List of Central Office Codes associated with a Rate Center no longer active in the NPA.]
  • List of Split Rate Centers - A list of rate centers that are split among multiple NPAs due to a regulatory order or state commission.
  • Part 3 Disconnect Report (xls) - Provides a list of central office codes with a pending disconnect date. Updated daily.
  • Central Office Code Activity Status Report - Provides the total number of new applications processed by NANPA by month for each state, including assignments, denials, changes and return requests. Updated monthly.

Central Office Code Administration Information

  • Getting Started with CO Code Requests (pdf) - Provides a list of helpful tips to assist new service providers in getting started with the central office code request process.
  • Getting Started for Interconnected VoIP Providers (pdf) - Provides information to assist those entities with approved interconnected VoIP numbering authorization applications with the central office code request process.
  • Evidence of State Certification (pdf) - Identifies what each state regulatory authority requires for evidence of certification to provide local service. This evidence must be included with any request for an initial code.
  • State PUC Numbering Contacts (xlsx) - Provides a list of state regulatory contacts for numbering issues.
  • Safety Valve Process (pdf) - This process is used by a service provider that initially makes an application for numbering resources and is denied by the resource administrator because the applicant does not meet the resource assignment requirements as stated in industry guidelines (e.g., months to exhaust (MTE) or utilization requirements). The service provider may appeal to the state regulatory to override the guidelines and permit the assignment of the resource. This matrix outlines the process for various states that participate in the safety valve process. If a state does not participate in the process, the safety valve request is submitted to the FCC.
  • Central Office Code Reclamation Procedures - Overview of the central office code reclamation process.
  • Central Office Code Reclamation Contact List - Provides a list of state and federal regulatory contacts for reclamation issues.
  • Summary of Rate Center Consolidations - Provides a summary of rate center consolidation activity in the U.S. from 2005 to the present.
  • Jeopardy Procedures - Listing of NPAs in which jeopardy has been declared. Also included are the CO code assignment procedures in effect for the NPA.

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