[Code of Federal Regulations]
[Title 47, Volume 3]
[Revised as of October 1, 2005]
From the U.S. Government Printing Office via GPO Access
[CITE: 47CFR52.20]

[Page 84]
 
                       TITLE 47--TELECOMMUNICATION
 
        CHAPTER I--FEDERAL COMMUNICATIONS COMMISSION (CONTINUED)
 
PART 52_NUMBERING--Table of Contents
 
                      Subpart C_Number Portability
 
Sec. 52.20  Thousands-block number pooling.

    Source: 61 FR 38637, July 25, 1996, unless otherwise noted. 
Redesignated at 61 FR 47353, Sept. 6, 1996.


    (a) Definition. 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.
    (b) General requirements. Pursuant to the Commission's adoption of 
thousands-block number pooling as a mandatory nationwide numbering 
resource optimization strategy, all carriers, except those exempted by 
the Commission, must participate in thousands-block number pooling where 
it is implemented and in accordance with the national thousands-block 
number pooling framework and implementation schedule established by the 
Commission.
    (c) Donation of thousands-blocks. (1) All service providers required 
to participate in thousands-block number pooling shall donate thousands-
blocks with ten percent or less contamination to the thousands-block 
number pool for the rate center within which the numbering resources are 
assigned.
    (2) All service providers required to participate in thousands-block 
number pooling shall be allowed to retain at least one thousands-block 
per rate center, even if the thousands-block is ten percent or less 
contaminated, as an initial block or footprint block.
    (d) Thousands-Block Pooling Administrator. (1) The Pooling 
Administrator shall be a non-governmental entity that is impartial and 
not aligned with any particular telecommunication industry segment, and 
shall comply with the same neutrality requirements that the NANPA is 
subject to under this part.
    (2) The Pooling Administrator shall maintain no more than a six-
month inventory of telephone numbers in each thousands-block number 
pool.

[65 FR 37709, June 16, 2000, as amended at 66 FR 9532, Feb. 8, 2001; 68 
FR 43009, July 21, 2003]