ATIS Telecom Glossary
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Thousand-Block (NXX-X) Number Pooling:

Thousands-block number pooling is a process by which the 10,000 numbers in a central office code (NXX) are separated into ten sequential blocks of 1,000 numbers each (thousands-blocks), and allocated separately within a rate center (FCC 00-104 ยง52.20 (a)).

 

 

 

 

 

 

 

 

 

 



 
These definitions were prepared by ATIS Committee PRQC
 
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