Statutes, codes, and regulations
Colorado Administrative Code
Department 700 - Department of Regulatory AgenciesDivision 723 - Public Utilities CommissionRule 4 CCR 723-2 - RULES REGULATING TELECOMMUNICATIONS SERVICES AND PROVIDERS OF TELECOMMUNICATIONS SERVICES
NUMBERING ADMINISTRATION
Section 4 CCR 723-2-2701 - Definitions

4 Colo. Code Regs. § 723-2-2701

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Current through Register Vol. 48, No. 1, January 10, 2025
Section 4 CCR 723-2-2701 - Definitions

The following definitions apply only in the context of rules 2700 through 2719:

(a) "Central office code" means the second three digits (NXX) of a ten-digit telephone number in the form NPA-NXX-XXXX. A central office code is also called an NXX code. The "N" denotes numbers 2 through 9 and X denotes numbers 0 through 9.
(b) "Central office code administrator" means the entity responsible for the administration of the NXXs within an NPA. The central office code administrator is also known as the North American Numbering Plan Administrator (NANPA).
(c) "Contaminated block" means any thousand block of telephone numbers where at least one telephone number is not available for assignment to end users.
(d) "Numbering Plan Area" (NPA) means the first three digits of a ten-digit telephone number in the North American Numbering Plan. This is also called an area code. NPAs are classified as either geographic or non-geographic.
(e) "NXX code holder" means any telecommunications service provider that has been assigned at least one central office code by the central office code administrator.
(f) "Pooling administrator" means the entity responsible for the administration and assignment of the thousand blocks in a pooling environment.
(g) "Thousand block" means a range of a thousand consecutive telephone numbers within a single NXX code, e.g., numbers NXX-1000 through NXX-1999 constitute a thousand block.

4 CCR 723-2-2701

39 CR 21, November 10, 2016, effective 12/1/2016
40 CR 15, August 10, 2017, effective 9/1/2017
41 CR 03, February 10, 2018, effective 3/2/2018
42 CR 02, January 25, 2019, effective 2/14/2019
42 CR 07, April 10, 2019, effective 4/30/2019
43 CR 02, January 25, 2020, effective 2/14/2020
43 CR 17, September 10, 2020, effective 8/17/2020
44 CR 17, September 10, 2021, effective 8/11/2021
44 CR 18, September 25, 2021, effective 10/15/2021
45 CR 03, February 10, 2022, effective 12/29/2021
45 CR 01, January 10, 2022, effective 1/30/2022
46 CR 05, March 10, 2023, effective 3/30/2023