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# What is NPA NXX ?
- URL: https://kudithipudi.org/what-is-npa-nxx/
- Published: 2006-03-03T21:57:28.000Z
- Updated: 2006-03-03T21:57:28.000Z
- Description: I am in the middle of ordering some data circuits for our new office and the vendor asks me for the address of the building where...
- Author: admin
- Tags: Technology, Uncategorized, #wp, #wp-post, #Import 2026-08-23 02:32

I am in the middle of ordering some data circuits for our new office and the vendor asks me for the address of the building where the circuits are going to be terminated. I give it to them and they come back with “what is the NPA NXX??” of the location. Now, I should admit that I haven’t been provisioning hardcode data circuits, but have ordered a bunch of T1s and DS3s during my career. I thought this was come kind of technical spec and swallowing my pride, asked the vendor what NPA NXX means.. and the answer..

“there are no dumb questions 🙂  
the first six digits of a phone number“

Looking up on the web, gave me this information

**NPA = (Numbering Plan Area code) The area code of a telephone number in the NPA system. The first NPA codes used 0 or 1 as the center digit, such as 201, 212, 301, 312, etc., designated as “N0/1X.” After July 1, 1995, all digits 0 through 9 are valid as the center digit, designated as “NXX.”**

All I can say is “live and learn” :).