Recent prefix assignments

357 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/23/2026

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. 39

NEW CINGULAR WIRELESS PCS, LLC - IL 28

ONVOY, LLC - CA 27

NEW CINGULAR WIRELESS PCS, LLC - DC 27

ONVOY, LLC - NJ 20

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
2011-02-24	581-359	not yet reported which blocks →	TELUS Quebec	8083	Grande-Riviere	—
2011-02-24	581-360	not yet reported which blocks →	TELUS Quebec	8083	Gaspe	—
2011-02-24	581-361	not yet reported which blocks →	TELUS Quebec	8083	Chandler	—
2011-02-24	581-362	not yet reported which blocks →	TELUS Quebec	8083	Carleton	—
2011-02-24	581-363	not yet reported which blocks →	TELUS Quebec	8083	Caplan	—
2011-02-24	581-364	not yet reported which blocks →	TELUS Quebec	8083	Bonaventure	—
2011-02-24	581-365	not yet reported which blocks →	TELUS Quebec	8083	Barachois	—
2011-02-24	773-949	0–9 XXXwhole prefix which blocks →	T-MOBILE USA, INC.	6529	CHICGOZN03	IL
2011-02-24	819-519	not yet reported which blocks →	Telecommunications Xittel Inc	247F	Trois-Rivieres	—
2011-02-24	985-500	0XXX3XXX4XXX5XXX7XXX8XXX · 5 holders which blocks →	METROPCS, INC.	5562	HAMMOND	LA
2011-02-23	317-628	0–9 XXXwhole prefix which blocks →	OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC	2964	INDIANAPLS	IN
2011-02-23	317-629	0–9 XXXwhole prefix which blocks →	OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC	2964	INDIANAPLS	IN
2011-02-23	513-888	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	CINCINNATI	OH
2011-02-23	561-907	0–9 XXXall 10 · 3 holders which blocks →	METROPCS, INC.	5562	WPALMBEACH	FL
2011-02-23	581-351	not yet reported which blocks →	TELUS Quebec	8083	Port-Daniel	—
2011-02-23	581-352	not yet reported which blocks →	TELUS Quebec	8083	Pointe-a-la-Croix	—
2011-02-23	581-353	not yet reported which blocks →	TELUS Quebec	8083	Perce	—
2011-02-23	581-354	not yet reported which blocks →	TELUS Quebec	8083	Nouvelle	—
2011-02-23	581-355	not yet reported which blocks →	TELUS Quebec	8083	New Richmond	—
2011-02-23	581-356	not yet reported which blocks →	TELUS Quebec	8083	Newport	—
2011-02-23	581-357	not yet reported which blocks →	TELUS Quebec	8083	New Carlisle	—
2011-02-23	581-358	not yet reported which blocks →	TELUS Quebec	8083	Maria	—
2011-02-23	651-375	0–9 XXXwhole prefix which blocks →	QWEST CORPORATION	9631	TWINCITIES	MN
2011-02-23	720-446	0–9 XXXall 10 · 3 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	DENVER	CO
2011-02-23	757-985	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	NRFOLKZON2	VA
2011-02-23	803-220	0–9 XXXall 10 · 3 holders which blocks →	POWERTEL ATLANTA LICENSES, INC.	7473	AIKEN	SC
2011-02-23	804-588	0–9 XXXall 10 · 6 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - VA	7238	RICHMOND	VA
2011-02-23	862-899	0–9 XXXall 10 · 3 holders which blocks →	METROPCS, INC.	5562	PASSAIC	NJ
2011-02-23	956-267	0–9 XXXall 10 · 6 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	LAREDO	TX
2011-02-22	239-400	0–9 XXXall 10 · 2 holders which blocks →	YMAX COMMUNICATIONS CORP. - FL	594D	FORT MYERS	FL
2011-02-22	254-400	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - TX	903C	WACO	TX
2011-02-22	310-935	0–9 XXXall 10 · 7 holders which blocks →	ONVOY, LLC - CA	649C	SAN PEDRO	CA
2011-02-22	336-738	0–9 XXXall 10 · 8 holders which blocks →	AT&T ENTERPRISES, LLC	516C	ANDERSON	NC
2011-02-22	407-255	0–9 XXXall 10 · 3 holders which blocks →	METROPCS NETWORKS, LLC	899D	ORLANDO	FL
2011-02-22	409-600	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - TX	903C	BEAUMONT	TX
2011-02-22	561-328	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - FL	982E	WPALMBEACH	FL
2011-02-22	631-405	0–9 XXXall 10 · 6 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY	7133	RIVERHEAD	NY
2011-02-22	706-223	0–9 XXXall 10 · 5 holders which blocks →	PAETEC ITEL, LLC	829J	COLUMBUS	GA
2011-02-22	801-900	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	PROVO	UT
2011-02-22	812-964	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - IN	097D	BLOOMINGTN	IN
2011-02-22	828-436	0–9 XXXall 10 · 4 holders which blocks →	AT&T ENTERPRISES, LLC	516C	LAKE LURE	NC
2011-02-22	857-261	0–9 XXXwhole prefix which blocks →	METROPCS, INC.	5562	BOSTON	MA
2011-02-22	864-300	0–9 XXXall 10 · 5 holders which blocks →	SUNCOM DBA T-MOBILE USA	8645	GAFFNEY	SC
2011-02-22	903-500	0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks →	ONVOY, LLC - TX	903C	LONGVIEW	TX
2011-02-22	910-418	0XXX1XXX2XXX4XXX7XXX8XXX9XXX · 5 holders which blocks →	AT&T ENTERPRISES, LLC	516C	GIBSON	NC
2011-02-22	915-600	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - TX	903C	EL PASO	TX
2011-02-22	919-893	0–9 XXXall 10 · 5 holders which blocks →	AT&T ENTERPRISES, LLC	516C	MOUNTOLIVE	NC
2011-02-22	951-322	0–9 XXXall 10 · 4 holders which blocks →	MCC TELEPHONY OF THE WEST, LLC - CA	857F	PERRIS	CA
2011-02-22	956-261	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	WESLACO	TX
2011-02-22	956-295	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	BROWNSVL	TX

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/23/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.