Recent prefix assignments

358 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/25/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, last 30 days

8X8, INC. 43

NEW CINGULAR WIRELESS PCS, LLC - DC 31

ONVOY, LLC - CA 27

NEW CINGULAR WIRELESS PCS, LLC - IL 27

ONVOY, LLC - NJ 15

New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025

Recent NPA-NXX prefix assignments
Assigned	NPA-NXX	Thousands-blocks taken (last-4 opening)	Code holder	OCN	Rate center	State
2012-11-05	319-382	0–9 XXXall 10 · 5 holders which blocks →	NUSO, LLC	551G	CEDAR RPDS	IA
2012-11-05	515-608	0–9 XXXall 10 · 4 holders which blocks →	NUSO, LLC	551G	DES MOINES	IA
2012-11-05	520-999	0–9 XXXall 10 · 6 holders which blocks →	ONVOY, LLC - AZ	630E	TUCSON	AZ
2012-11-05	563-362	0–9 XXXall 10 · 5 holders which blocks →	NUSO, LLC	551G	DAVENPORT	IA
2012-11-05	602-600	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - AZ	630E	PHOENIX	AZ
2012-11-05	602-800	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - AZ	630E	PHOENIX	AZ
2012-11-05	630-394	0–9 XXXall 10 · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IL	984E	KANEVILLE	IL
2012-11-05	805-394	0–9 XXXall 10 · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	OXNARD	CA
2012-11-02	206-858	0–9 XXXall 10 · 5 holders which blocks →	ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM	7173	SEATTLE	WA
2012-11-02	314-478	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	KIRKWOOD	MO
2012-11-02	317-914	0–9 XXXall 10 · 4 holders which blocks →	NUSO, LLC	551G	INDIANAPLS	IN
2012-11-02	318-606	0–9 XXXall 10 · 6 holders which blocks →	NUSO, LLC	551G	SHREVEPORT	LA
2012-11-02	424-285	0–9 XXXall 10 · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	BEVERLYHLS	CA
2012-11-02	469-413	0–9 XXXwhole prefix which blocks →	SOUTHWESTERN BELL	9533	DALLAS	TX
2012-11-02	469-419	0–9 XXXwhole prefix which blocks →	SOUTHWESTERN BELL	9533	DALLAS	TX
2012-11-02	478-336	0–9 XXXall 10 · 5 holders which blocks →	NUSO, LLC	551G	MACON	GA
2012-11-02	515-393	0–9 XXXall 10 · 5 holders which blocks →	UNITED STATES CELLULAR - IA	6266	DES MOINES	IA
2012-11-02	567-316	0–9 XXXall 10 · 5 holders which blocks →	OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC	2964	TOLEDO	OH
2012-11-02	581-622	not yet reported which blocks →	TELUS Mobility	8303	Natashquan	—
2012-11-02	581-682	not yet reported which blocks →	Fibernetics Corporation	464D	La Baie (Chicoutimi Co.)	—
2012-11-02	581-683	not yet reported which blocks →	Fibernetics Corporation	464D	Chicoutimi	—
2012-11-02	581-684	not yet reported which blocks →	Fibernetics Corporation	464D	Jonquiere	—
2012-11-02	602-642	0–9 XXXwhole prefix which blocks →	T-MOBILE USA, INC.	6529	PHOENIX	AZ
2012-11-02	602-752	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	PHOENIX	AZ
2012-11-02	669-223	0–9 XXXall 10 · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA	7240	SNJS WEST	CA
2012-11-02	720-585	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	DENVER	CO
2012-11-02	805-420	0–9 XXXall 10 · 5 holders which blocks →	TWC IP ENABLED SERVICES, LLC	793K	SANTAPAULA	CA
2012-11-02	832-762	0–9 XXXall 10 · 3 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - TX	7138	HSTNSUBURB	TX
2012-11-01	501-404	0–9 XXXall 10 · 4 holders which blocks →	NUSO, LLC	551G	LITTLEROCK	AR
2012-11-01	501-420	1XXX2XXX3XXX4XXX5XXX6XXX · 3 holders which blocks →	T-MOBILE USA, INC.	6529	LITTLEROCK	AR
2012-11-01	615-610	0–9 XXXall 10 · 4 holders which blocks →	PEERLESS NETWORK OF TENNESSEE, LLC - TN	276F	NASHVILLE	TN
2012-11-01	763-600	0–9 XXXall 10 · 6 holders which blocks →	ONVOY, LLC - MN	184D	TWINCITIES	MN
2012-11-01	952-666	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - MN	184D	TWINCITIES	MN
2012-10-31	203-680	0–9 XXXall 10 · 4 holders which blocks →	SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT	9147	NEW HAVEN	CT
2012-10-31	225-407	0–9 XXXall 10 · 4 holders which blocks →	NUSO, LLC	551G	BATONROUGE	LA
2012-10-31	254-301	0–9 XXXall 10 · 4 holders which blocks →	NUSO, LLC	551G	WACO	TX
2012-10-31	331-216	0–9 XXXall 10 · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	OSWEGO	IL
2012-10-31	337-443	0–9 XXXall 10 · 6 holders which blocks →	NUSO, LLC	551G	LAFAYETTE	LA
2012-10-31	361-402	0–9 XXXall 10 · 6 holders which blocks →	NUSO, LLC	551G	C CHRISTI	TX
2012-10-31	402-769	0–9 XXXall 10 · 6 holders which blocks →	NUSO, LLC	551G	OMAHA	NE
2012-10-31	431-800	not yet reported which blocks →	Iristel Inc.	154E	Winnipeg	—
2012-10-31	504-434	0–9 XXXall 10 · 6 holders which blocks →	NUSO, LLC	551G	NEWORLEANS	LA
2012-10-31	520-373	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	TUCSON	AZ
2012-10-31	587-744	not yet reported which blocks →	Distributel	081E	Fort Saskatchewan	—
2012-10-31	587-745	not yet reported which blocks →	Distributel	081E	Sherwood Park	—
2012-10-31	587-746	not yet reported which blocks →	Distributel	081E	Athabasca	—
2012-10-31	618-501	0–9 XXXall 10 · 5 holders which blocks →	PAETEC ITEL, LLC	829J	GRANITE CY	IL
2012-10-31	631-515	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC- NY	384C	SHELTER IS	NY
2012-10-31	701-715	0–9 XXXall 10 · 3 holders which blocks →	NUSO, LLC	478J	FARGO	ND
2012-10-31	778-553	not yet reported which blocks →	TELUS Mobility	8301	Fort Nelson	—

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/25/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.