Recent prefix assignments

337 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 28

ONVOY, LLC - CA 26

NEW CINGULAR WIRELESS PCS, LLC - IL 25

U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 12

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
2021-12-03	563-338	8XXX9XXX · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	HOPKINTON	IA
2021-12-03	563-509	9XXX which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	LIME SPG	IA
2021-12-03	585-614	3XXX4XXX6XXX · 3 holders which blocks →	ONVOY, LLC- NY	384C	SHORTSVL	NY
2021-12-03	641-252	2XXX4XXX9XXX · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	DUMONT	IA
2021-12-03	641-506	9XXX which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	ZEARING	IA
2021-12-03	641-916	6XXX9XXX · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	ST CHARLES	IA
2021-12-03	667-374	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - MD	071F	WATERLO238	MD
2021-12-03	715-728	1XXX2XXX which blocks →	NUSO, LLC	478J	EAU CLAIRE	WI
2021-12-03	720-906	1XXX which blocks →	COMCAST IP PHONE, LLC	318J	BYERS	CO
2021-12-03	727-486	0–9 XXXwhole prefix which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - FL	6502	CLEARWATER	FL
2021-12-03	781-692	0–9 XXXwhole prefix which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	BRAINTREE	MA
2021-12-03	781-809	0–9 XXXall 10 · 3 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	DEDHAM	MA
2021-12-03	782-980	not yet reported which blocks →	ISP Telecom Inc.	4727	Wallace	—
2021-12-03	782-981	not yet reported which blocks →	ISP Telecom Inc.	4727	Wolfville	—
2021-12-03	782-982	not yet reported which blocks →	ISP Telecom Inc.	4727	Windsor	—
2021-12-03	830-375	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - TX	903C	BOERNE	TX
2021-12-03	857-391	0–9 XXXall 10 · 3 holders which blocks →	OMNIPOINT MIAMI E LICENSE, LLC	6889	CHARLESTN	MA
2021-12-03	901-657	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - GA	6214	SOMERVILLE	TN
2021-12-03	912-613	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - GA	6214	DOUGLAS	GA
2021-12-03	937-891	8XXX which blocks →	TWILIO INTERNATIONAL, INC.	506J	CEDARVILLE	OH
2021-12-03	959-237	0–9 XXXall 10 · 4 holders which blocks →	OMNIPOINT COMMUNICATIONS, INC. - CT	6624	GLASTONBY	CT
2021-12-02	213-646	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	LSAN DA 05	CA
2021-12-02	249-563	not yet reported which blocks →	Fibernetics Corporation	464D	Algonquin Park	—
2021-12-02	249-564	not yet reported which blocks →	Fibernetics Corporation	464D	Baysville	—
2021-12-02	249-565	not yet reported which blocks →	Fibernetics Corporation	464D	Britt	—
2021-12-02	249-566	not yet reported which blocks →	Fibernetics Corporation	464D	Dwight	—
2021-12-02	249-567	not yet reported which blocks →	Fibernetics Corporation	464D	Emsdale	—
2021-12-02	249-568	not yet reported which blocks →	Fibernetics Corporation	464D	Magnetawan	—
2021-12-02	249-569	not yet reported which blocks →	Fibernetics Corporation	464D	Milford Bay	—
2021-12-02	249-570	not yet reported which blocks →	Fibernetics Corporation	464D	Nobel	—
2021-12-02	249-571	not yet reported which blocks →	Fibernetics Corporation	464D	Otter Lake	—
2021-12-02	249-572	not yet reported which blocks →	Fibernetics Corporation	464D	Port Sydney	—
2021-12-02	249-573	not yet reported which blocks →	Fibernetics Corporation	464D	South River	—
2021-12-02	249-574	not yet reported which blocks →	Fibernetics Corporation	464D	Sprucedale	—
2021-12-02	252-540	0–9 XXXall 10 · 6 holders which blocks →	NUSO, LLC	478J	GREENVILLE	NC
2021-12-02	254-484	0XXX1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	ONVOY, LLC - TX	903C	MCGREGOR	TX
2021-12-02	319-388	1XXX3XXX4XXX7XXX8XXX · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IA	9877	DONNELLSON	IA
2021-12-02	319-893	0–9 XXXall 10 · 5 holders which blocks →	TWILIO INTERNATIONAL, INC.	506J	CEDAR RPDS	IA
2021-12-02	423-705	0–9 XXXall 10 · 4 holders which blocks →	NUSO, LLC	478J	JOHNSON CY	TN
2021-12-02	423-719	0–9 XXXall 10 · 4 holders which blocks →	NUSO, LLC	478J	CHATTNOOGA	TN
2021-12-02	424-468	0–9 XXXwhole prefix which blocks →	T-MOBILE USA, INC.	6529	BEVERLYHLS	CA
2021-12-02	480-847	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	PHOENIX	AZ
2021-12-02	517-440	0XXX1XXX2XXX8XXX9XXX · 3 holders which blocks →	NUSO, LLC	478J	LANSING	MI
2021-12-02	520-630	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - AZ	630E	WILLCOX	AZ
2021-12-02	623-280	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	PHOENIX	AZ
2021-12-02	712-895	0–9 XXXall 10 · 2 holders which blocks →	TWILIO INTERNATIONAL, INC.	506J	SIOUX CITY	IA
2021-12-02	765-690	1XXX2XXX which blocks →	NUSO, LLC	478J	RICHMOND	IN
2021-12-02	782-715	not yet reported which blocks →	ISP Telecom Inc.	4727	Shubenacadie	—
2021-12-02	782-716	not yet reported which blocks →	ISP Telecom Inc.	4727	Southampton	—
2021-12-02	782-717	not yet reported which blocks →	ISP Telecom Inc.	4727	Springhill	—

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.