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      • You can view information for a code by entering the “NPANXX” (no hyphens) into the primary search bar in Network. This will return to you the code, assigned date, assigned SPID/OCN, as well as the LATA, state, and rate center the code is associated with.
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  2. This lookup uses the North American NPA NXX Wire Center Edition Database and supplemental data to find the Wire Center, Rate Center, locality, LATA, carrier, and other details associated with any United States or Canadian NPA NXX combination.

  3. Search area code/prefix ( NPA / NXX) NPA NXX Block OCN Region LATA LIR Switch. Effective date within past or next days. Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.

  4. 1-800-425-1169. Area Code Lookup - NPA NXX. Lookup any area code by area code, prefix, city, state, zip code, county or any of the fields shown above. Only one field needs to be entered but you can filter the results by entering information in additional fields. Area Code Lookup.

  5. NANPA Updates. April 2024 NPA, NANP and 5XX Exhaust Analysis. New Combined NANPA System and Website Update. Reminder of 45-Day Minimum Aging Period for Numbers. 2023 NANPA Annual Report.

  6. Central Office (CO) Code. A Central Office (CO) code or NXX code refers to the second three digits (also called digits D-E-F) of a ten-digit telephone number in the form of NPA-NXX-XXXX, where N represents any one of the numbers 2 through 9 and X represents any one of the numbers 0 through 9.

  7. Area Code and Prefix Lookup. Area Code & Prefix Lookup by Location. Click on the map or enter a United States, Canadian, or Caribbean address, city state, province or similar location to find the telephone area codes and prefixes for the area. Find all NPA NXX used in geographic area.

  8. Search by NPA and NXX, State and City or by LATA. Select from several options below. KFR's free NPA-NXX lookup is great for checking which area codes and prefixes are assigned to a given rate center, what rate center a particular NPA-NXX is in or what area codes are in a specific state.

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