North American Local Exchange NPA NXX Database™

NALENND® is the field proven NPA NXX telephone exchange database of all active area codes and central office codes within the North American Numbering Plan (NANP).

NALENND<sup>®</sup> North American Local Exchange NPA NXX Database™

Compiled directly from definitive industry and regulatory sources, NALENND® delivers current, accurate NPA NXX thousands-block assignments and associated data including block pooled indicator, portability indicator, NXX type (wireline, paging, cellular, VoIP etc.), Rate Center, Wire Center, switch CLLI code, OCN, LATA, MTA, V&H coordinates, Latitude, Longitude, Time Zone and Daylight Savings Indicators and more suitable for use in a variety of mission critical applications.

Produced: on or before 5th calendar day monthly
Current Release: December 2, 2021
Distribution Frequency: monthly or quarterly (issue date: January, April, July, October)
Distribution Format: Internet download

Quick Comparison of the NALENND® North American Local Exchange NPA NXX Database™ Editions
 Wire Center Edition  Rate Center Edition  Platinum Edition  Gold Edition  
NPA (Area Code)
NXX (Central Office Code)
Thousands Block Identifier
Thousands Block Pooled Indicator
Local Access and Transport Area (LATA)
Local Interconnection Region (LIR)
NXX Type (land line, wireless, VoIP, etc.)
Thousands Block Contaminated Flag
State, Province or Territory
Wire Center Name
Wire Center V&H Coordinates
Switch CLLI™ Code
Rate Center Number Pooling Status
Rate Center Type (Zoned, Suburban, etc.)
Rate Center Name
Rate Center V&H Coordinates
Rate Center Industry Abbreviation
Time Zone Abbreviation
Daylight Saving Time Recognized Flag
ZIP or Postal Codes1
County or County Equivalent Codes2
Current Metropolitan Statistical Area Codes3
Historical Metropolitan Statistical Area Codes4 (MSA/PMSA)
Service Area Latitude and Longitude
Carrier Type
Carrier NECA assigned OCN
Original or Parent NPA
Block Scheduled for Disconnect Flag
Central Office Code Assignment Date 5
Central Office Code Effective Date 6
Major Trading Area (MTA)
Basic Trading Area (BTA)
NXX Detail Type (function)
Olson Database Time Zone Identifier
Coordinated Universal Time (UTC)
Portability Indicator

1 Each NPA NXX record may contain up to four U.S. Zip codes or four Canada Postal FSA codes.
2 U.S. FIPS county codes or Canadian Census Division codes may contain up to three.
3 U.S. CBSA codes or Statistics Canada CMA/CA codes.
4 U.S. (only) historical CMSA, PMSA, and MSA codes.
5 For those U.S. resources assigned through NANPA or the National Pooling Administrator.
6 Date block became active, last modified or scheduled for disconnect.