Question about the first 3 digits in a phone number (not area code)??

Question

K, i live in a big city and there seems to be millions of first 3-digit numbers.. if you drive down the street one mile, you are in an area that uses a different first three.. So.. my question is, is there a way you canlook up what part of town a certain 3-digit number is used in??? Like where it starts and stops. How can I look it up?

Note: hope my question made sense.. im talking about the first 3-digits in a 7-digit phone number.

Answer 1

A big city in which country?

Answer 2

Its called the Local Exchange Prefix.

and the answer is no, not anymore.

This data is not used for central office switching any longer, it was used back in the late 90's but electronic switchs ended that, prefixs are not area specific any longer with porting of numbers.

http://www.dialabc.com/words/prefix/

Answer 3

I don't think you are able to do this.  I think now, with so many people in cities, and people moving while keeping their original phone number, the "3 digit prefixes" are specific or a city but not an area within a city.

Answer 4

you mean the exchange!!

Central Office Codes

Central office codes, also known as exchanges, prefixes, or simply NXXs, are digits 4, 5 and 6 of a ten-digit geographic NANP telephone number. NANPA assigns central office codes to state-authorized local service providers using industry-developed guidelines and federal directives. Because the application and qualification process is complex, potential applicants should read and understand the guidelines.

http://www.thedirectory.org/pref/

http://www.pc-shareware.com/phonex.htm

http://www.nanpa.com/number_resource_inf...