Planning Letters

The Planning Letters (PL) and Informational Letters (IL) are sorted by publication date. To view or download a PL or IL, you can search by year or search by planning/informational letter number. To search by a planning letter number e.g., 623, select “Any” as the year and enter the Planning Letter number using this format “PL-XXX” e.g., PL-623. To search by an Informational Letter, select “Any” as the year and enter the Informational Letter number using this format “IL-XX-XX-XXX” or “IL-XXX-XX-XX-XXX” e.g., IL-91-05-035.

The PL page does default to “Any”

Year: 1997
Year	Number	Subject
01-15-1997	PL-030	Declaration of Jeopardy Situation in NPA 501 (Arkansas)
01-15-1997	PL-029	NANP-Introduction of New 649 (Turks and Caicos Islands) Numbering Plan Area (NPA)
01-02-1997	PL-028	NANP-Split of 818 (California) Numbering Plan Area (NPA)

Year: 1996
Year	Number	Subject
12-19-1996	PL-027	Extraordinary NPA-Specific Conservation Procedures for 310, 415, 619 and 714 NPAs (California)
12-11-1996	PL-026	Declaration of Jeopardy Situation in NPA 717 (Pennsylvania)
12-02-1996	PL-025	Declaration of Jeopardy Situation in NPA 210 (Texas)
11-25-1996	PL-024	NANP-Introduction of New 473 (Grenada) Numbering Plan Area (NPA)
11-22-1996	PL-023	Declaration of Jeopardy Situation in NPA 414 (Wisconsin)
11-22-1996	PL-022	NANP-Split of 415 (California) Numbering Plan Area (NPA)
11-15-1996	PL-021	Declaration of Jeopardy Situation in NPA 817 (Texas)
11-08-1996	PL-020	NANP-Introduction of New 284 (British Virgin Islands) Numbering Plan Area (NPA)
10-31-1996	PL-019	NANP-Split of 206 (Washington State) Numbering Plan Area (NPA)
10-31-1996	PL-018	NANP-Overlay of 412 (Pennsylvania) Numbering Plan Area (NPA)
10-30-1996	PL-017	Declaration of Jeopardy Situation in NPA 212 (New York)
10-29-1996	PL-016	Declaration of Jeopardy Situation in NPA 714 (California)
10-15-1996	PL-015	NANP-Introduction of New 264 (Anguilla) Numbering Plan Area (NPA)
10-09-1996	PL-014	NANP-Introduction of New 876 (Jamaica) Numbering Plan Area (NPA)
09-30-1996	PL-013	NANP-Introduction of New 867 (Yukon & Northwest Territories) Numbering Plan Area (NPA)
10-08-1996	PL-012	NANP-Split of 810 (Michigan) Numbering Plan Area (NPA)
09-13-1996	PL-011	Change in Test Number for the New 869 (St. Kitts & Nevis) Numbering Plan Area (NPA)
09-04-1996	PL-010	NANP-Introduction of New 670 (CNMI) Numbering Plan Area (NPA)
09-03-1996	PL-009	NANP-Split of 317 (Indiana) Numbering Plan Area (NPA)
08-26-1996	PL-008	Declaration of Jeopardy Situation in NPA 508 (Massachusetts)
08-06-1996	PL-007	Declaration of Jeopardy Situation in NPA 407 (Florida)
08-05-1996	PL-006	NANP-Split of 713 (Texas) Numbering Plan Area (NPA)
08-05-1996	PL-005	NANP-Split of 214 (Texas) Numbering Plan Area (NPA)
08-05-1996	PL-004	NANP- Introduction of New 671 (Guam) Numbering Plan Area (NPA)
07-12-1996	PL-003	NANP-Introduction of New 767 (Dominica) Numbering Plan Area (NPA)
07-11-1996	PL-002	NANP-Introduction of New 345 (Cayman Islands) Numbering Plan Area (NPA)
07-02-1996	PL-001	NANP-Introduction of New 869 (St. Kitts and Nevis) Numbering Plan Area (NPA)
05-13-1996	PL-000	NANP-Introduction of North American Numbering Plan (NANP) Planning Letters
07-17-1996	IL-96-07-004	Correction to 301 NPA (Maryland) Relief Plan Contact Information
06-28-1996	IL-96-06-011	NANP-Split of 513 (Ohio) Numbering Plan Area (NPA)
06-21-1996	IL-96-06-009	NANP-Overlay of 301 (Maryland) Numbering Plan Area (NPA)
06-21-1996	IL-96-06-008	NANP-Overlay of 410 (Maryland) Numbering Plan Area (NPA)
06-04-1996	IL-96-06-001	NANP-Introduction of New 868 (Trinidad & Tobago) Numbering Plan Area (NPA)
04-30-1996	IL-96-04-016	Designation of Universal IntraLATA Presubscribed Carrier Verification Number
04-01-1996	IL-96-04-014	NANP-Introduction of New 758 (St. Lucia) Numbering Plan Area (NPA)
04-22-1996	IL-96-04-010	NANP-Introduction of New 664 (Montserrat) Numbering Plan Area (NPA)
04-22-1996	IL-96-04-009	NANP-Split of 619 (California) Numbering Plan Area (NPA)
03-26-1996	IL-96-03-005	NANP-Introduction of New 268 (Antigua & Barbuda) Numbering Plan Area (NPA)
02-29-1996	IL-96-02-014	NANP-Split of 312 (Illinois) Numbering Plan Area (NPA)
02-29-1996	IL-96-02-013	NANP-SPLIT OF 804 (VIRGINIA) NUMBERING PLAN AREA (NPA)
02-08-1996	IL-96-02-004	NANP-SPLIT OF 407 NUMBERING PLAN AREA (NPA)
01-30-1996	IL-96-01-017	REVISIONS TO THE SPLIT OF 612 (MINNESOTA) NUMBERING PLAN AREA (NPA)
01-01-1996	IL-96-01-016	NORTH AMERICAN NUMBERING PLAN NUMBERING PLAN AREA CODES - 1996 UPDATE
01-25-1996	IL-96-01-012	NANP-SPLIT OF 310 (CALIFORNIA) NUMBERING PLAN AREA (NPA)

Year: 1995
Year	Number	Subject
12-11-1995	IL-95-12-007	NANP-ASSIGNMENT OF 880 AND 881 NPAS FOR INBOUND FOREIGN BILLED CALLS TO TOLL-FREE NUMBERS
12-11-1995	IL-95-12-006	NANP-INTRODUCTION OF 246 (BARBADOS) NUMBERING PLAN AREA (NPA)
12-11-1995	IL-95-12-005	NANP-INTRODUCTION OF NEW 787 (PUERTO RICO) NUMBERING PLAN AREA (NPA)
11-17-1995	IL-95-11-009	NANP-INTRODUCTION OF 242 (BAHAMAS) NUMBERING PLAN AREA (NPA)
11-17-1995	IL-95-11-008	NANP-SPLIT OF 216 (OHIO) NUMBERING PLAN AREA (NPA)
11-17-1995	IL-95-11-007	NANP CAPACITY EXPANSION STUDY BY THE INC
09-27-1995	IL-95-09-008	NANP-SPLIT OF 904 (FLORIDA) NUMBERING PLAN AREA (NPA)
09-15-1995	IL-95-09-007	NANP-SPLIT OF 612 (MINNESOTA) NUMBERING PLAN AREA (NPA)
08-31-1995	IL-95-08-015	NANP-SPLIT OF 314 (MISSOURI) NUMBERING PLAN AREA (NPA)
08-23-1995	IL-95-08-011	NANP-SPLIT OF 305 (FLORIDA) NUMBERING PLAN AREA (NPA)
08-17-1995	IL-95-08-007	NANP-SPLIT OF 604 (BRITISH COLUMBIA) NUMBERING PLAN AREA (NPA)
07-27-1995	IL-95-07-015	NANP-SPLIT OF 708 (ILLINOIS) NUMBERING PLAN AREA (NPA)
06-22-1995	IL-95-06-008	NANP-SPLIT OF 404 (GEORGIA) NUMBERING PLAN AREA (NPA)
06-08-1995	IL-95-06-004	NANP-STATUS OF CARRIER IDENTIFICATION CODE (CIC) EXPANSION
05-25-1995	IL-95-05-010	NANP-ASSIGNMENT OF 888 NPA FOR TOLL-FREE SERVICES
05-19-1995	IL-95-05-007	NANP-SPLIT OF 503 (OREGON) NUMBERING PLAN AREA (NPA)
05-05-1995	IL-95-05-004	NANP-EXTENSION OF PERMISSIVE DIALING FOR 360 NPA (WASHINGTON STATE)
04-21-1995	IL-95-04-007	NANP-ADVANCE OF 703 NPA (VIRGINIA) PERMISSIVE DIALING PERIOD
04-06-1995	IL-95-04-002	NANP-SPLIT OF 203 (CONNECTICUT) NUMBERING PLAN AREA (NPA)
03-14-1995	IL-95-03-006	NANP-SPLIT OF 803 (SOUTH CAROLINA) NUMBERING PLAN AREA (NPA)
03-08-1995	IL-95-03-002	NANP-OVERLAY OF 214 (TEXAS) NUMBERING PLAN AREA (NPA)
01-31-1995	IL-95-01-018	NORTH AMERICAN NUMBERING PLAN NUMBERING PLAN AREA CODES - 1995 UPDATE

Year: 1994
Year	Number	Subject
12-28-1994	IL-94-12-008	NANP-OVERLAY OF 310 (CALIFORNIA) NUMBERING PLAN AREA (NPA)
12-28-1994	IL-94-12-007	NANP-ASSIGNMENT AND PROTECTION OF ADDITIONAL PCS NPA CODES
11-22-1994	IL-94-11-018	NANP-SPLIT OF 615 (TENNESSEE) NUMBERING PLAN AREA (NPA)
11-16-1994	IL-94-11-016	NANP-INTRODUCTION OF NEW 441 (BERMUDA) NUMBERING PLAN AREA (NPA)
11-16-1994	IL-94-11-014	NANP-RETURN OF 800-555 TO THE 800 SMS
09-21-1994	IL-94-09-013	NANP-SPLIT OF 813 (FLORIDA) NUMBERING PLAN AREA (NPA)
09-21-1994	IL-94-09-012	NANP-SPLIT OF 303 (COLORADO) NUMBERING PLAN AREA (NPA)
08-19-1994	IL-94-08-012	NANP-OVERLAY OF 713 (TEXAS) NUMBERING PLAN AREA (NPA)
08-09-1994	IL-94-08-005	NANP-SPLIT OF 703 (VIRGINIA) NUMBERING PLAN AREA (NPA)
08-09-1994	IL-94-08-004	NANP-OVERLAY OF 708 (ILLINOIS) NUMBERING PLAN AREA (NPA)
05-19-1994	IL-94-05-005	NANP-ASSIGNMENT OF SERVICE ACCESS CODE (SAC) 500 FOR PCS
05-13-1994	IL-94-05-004	NANP-APPROVAL OF 555 NXX ASSIGNMENT GUIDELINES AND IMPLEMENTATION TIMELINE
01-26-1994	IL-94-01-033	NANP-SPLIT OF 205 (ALABAMA) NUMBERING PLAN AREA (NPA)
01-21-1994	IL-94-01-030	NANP-SPLIT OF 602 (ARIZONA) NUMBERING PLAN AREA (NPA)
01-21-1994	IL-94-01-029	NANP-SPLIT OF 206 (WASHINGTON STATE) NUMBERING PLAN AREA (NPA)
01-03-1994	IL-94-01-002	OPENING OF 710 NUMBERING PLAN AREA (NPA) CODE
01-03-1994	IL-94-01-001	STATUS OF NUMBERING IN THE NANP SERVED AREA

Year: 1993
Year	Number	Subject
08-02-1993	IL-93-08-002	ASSIGNMENT OF NPA CODE "456" FOR INTERNATIONAL CARRIER IDENTIFICATION
04-15-1993	IL-93-04-026	INTRODUCTION OF SERVICE ACCESS CODE (SAC) 600 IN CANADA
04-09-1993	IL-93-04-016	UPDATED INFORMATION ON THE GEORGIA 404/706 SPLIT AND THE CALIFORNIA 714/909 SPLIT
01-13-1993	IL-93-01-017	STATUS OF NUMBERING PLAN AREA (NPA) CODES IN WORLD ZONE 1
01-08-1993	IL-93-01-008	NORTH AMERICAN NUMBERING PLAN ADMINISTRATOR'S PROPOSAL ON THE FUTURE OF NUMBERING IN WORLD ZONE 1 - SECOND EDITION
01-05-1993	IL-93-01-001	NANP-SPLIT OF 215 (PENNSYLVANIA) NUMBERING PLAN AREA (NPA)

Year: 1992
Year	Number	Subject
11-13-1992	IL-92-11-024	NANP-SPLIT OF 919 (NORTH CAROLINA) NUMBERING PLAN AREA (NPA)
11-23-1992	IL-92-11-022	NANP-SPLIT OF 313 (MICHIGAN) NUMBERING PLAN AREA (NPA)
10-20-1992	IL-92-10-017	FUTURE WORK PLAN: NANPA'S PROPOSAL ON THE FUTURE OF NUMBERING IN WORLD ZONE 1
10-01-1992	IL-92-09-046	NANP-SPLIT OF 416 (ONTARIO, CANADA) NUMBERING PLAN AREA (NPA)
03-01-1992	IL-92-03-068	NANP-SPLIT OF 512 (SOUTH TEXAS) NUMBERING PLAN AREA (NPA)
02-18-1992	IL-92-02-022	NANP-SPLIT OF 714 (CALIFORNIA) NUMBERING PLAN AREA (NPA)
01-06-1992	IL-92-01-013	NORTH AMERICAN NUMBERING PLAN ADMINISTRATOR'S PROPOSAL ON THE FUTURE OF NUMBERING IN WORLD ZONE 1

Year: 1991
Year	Number	Subject
10-30-1991	IL-91-10-058	NANP-SPLIT OF THE 404 NUMBERING PLAN AREA (NPA) AND DIALING PROCEDURE CHANGES IN THE 912 NPA IN THE STATE OF GEORGIA