What is nxx?

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What does the nxx prefix mean?

The nxx prefix is a telecommunications term that stands for “network exchange.” This term is used to describe the process of connecting two telephone networks.

When you need to connect two telephone networks, you’ll need to use the nxx prefix. By using this prefix, you’ll be able to establish a connection between the two networks and allow calls to flow between them.

what is nxxx

what is nxxx

What is NXX?

NXX, commonly referred to as the Central Office Code or Exchange, is an essential component in a 10-digit telephone number. It acts like the middle child of sorts – not quite part of our area code’s family but still integral for connecting us with friends and loved ones all over the world!

For example: The NXX ‘101’ adds some necessary flavor to 555-101-1234.

In the old days, phone numbers were like real estate – companies had to compete for prime NXX-codes. These three digit codes form the second part of a 10-digit North American number, and traditionally each code was assigned exclusively to one provider.

But these rules have since relaxed; nowadays providers can own individual blocks of 1,000 rather than 10K at once – giving more freedom in choosing your perfect digits!

And thanks to number portability regulations customers don’t even need those same owners anymore when they move house…or change service provider.

Webster’s New World Telecom Dictionary. Copyright 2010 by Wiley Publishing, Inc., Indianapolis, Indiana. Used by arrangement with John Wiley & Sons, Inc.

What is NPA?

Numbering Plan Areas (NPAs) are the basis for area codes, those three-digit numbers that we dial to make phone calls.

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Although an NPA can stretch across multiple rate centers–what would otherwise be separate regions with their own identifiers–the 305 area code in Florida is a prime example, existing among five different areas: Keys, Miami, Homestead, North Dade and Perrine.

So if you call someone whose number begins with “305,” it could come from any of these parts of the sunshine state!



Every area code may seem like a giant web of numbers, but each three-digit prefix within it reveals an intricate story. Whether they refer to individual cities or specific pockets of them, telephone prefixes give us an intimate view into the geography and culture of any given region.


Make sure you never forget your Area Code. This three-digit number, otherwise known as an NPA (Number Planning Area), is a must if using the telephone – it’s how we identify which service region belongs to who! So keep this in mind next time someone asks for your phone number – don’t leave off that crucial code of yours!

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