Recent prefix assignments

1 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 — NPA 224

NEW CINGULAR WIRELESS PCS, LLC - IL 1

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
2016-02-24	224-487	0–9 XXXall 10 · 7 holders which blocks →	ONVOY, LLC	224C	CARY	IL
2016-02-17	224-259	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC	224C	ANTIOCH	IL
2016-02-17	224-775	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	DESPLAINES	IL
2016-02-02	224-877	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC	224C	ELK GROVE	IL
2015-12-23	224-313	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks →	ONVOY, LLC	224C	WHEELING	IL
2015-12-21	224-204	0–9 XXXall 10 · 7 holders which blocks →	ONVOY, LLC	224C	EVANSTON	IL
2015-12-10	224-219	0–9 XXXall 10 · 6 holders which blocks →	ONVOY, LLC	224C	WAUKEGAN	IL
2015-12-09	224-998	0–9 XXXall 10 · 5 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - IL	7136	SKOKIE	IL
2015-11-23	224-651	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	DESPLAINES	IL
2015-10-23	224-540	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	ROUND LAKE	IL
2015-09-16	224-571	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	NORTHBROOK	IL
2015-08-28	224-985	0–9 XXXall 10 · 5 holders which blocks →	COMCAST IP PHONE, LLC	318J	PARK RIDGE	IL
2015-08-17	224-931	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	MUNDELEIN	IL
2015-06-26	224-258	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	ARLIGTNHTS	IL
2015-06-23	224-857	0–9 XXXall 10 · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	ARLIGTNHTS	IL
2015-06-19	224-808	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	NORTHBROOK	IL
2015-05-22	224-469	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	WAUKEGAN	IL
2015-03-24	224-530	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	COMCAST IP PHONE, LLC	318J	PLATO CTR	IL
2015-03-06	224-908	0–9 XXXall 10 · 5 holders which blocks →	COMCAST IP PHONE, LLC	318J	FOX LAKE	IL
2015-02-20	224-517	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	BARRINGTON	IL
2015-02-20	224-716	0–9 XXXwhole prefix which blocks →	T-MOBILE USA, INC.	6529	ALGONQUIN	IL
2015-02-13	224-269	0–9 XXXall 10 · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IL	984E	GLENCOE	IL
2015-02-13	224-970	0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IL	984E	BARTLETT	IL
2015-01-21	224-518	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	ARLIGTNHTS	IL
2015-01-20	224-510	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - IL	7136	WHEELING	IL
2015-01-08	224-516	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	LAKEFOREST	IL
2015-01-05	224-509	0–9 XXXall 10 · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL	7196	ALGONQUIN	IL
2014-12-22	224-458	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	NORTHBROOK	IL
2014-12-19	224-507	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	DEERFIELD	IL
2014-12-17	224-505	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC	224C	WINNETKA	IL
2014-11-14	224-504	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	LIBERTYVL	IL
2014-11-07	224-435	0–9 XXXall 10 · 5 holders which blocks →	T-MOBILE USA, INC.	6529	GLENVIEW	IL
2014-11-06	224-727	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	DEERFIELD	IL
2014-10-27	224-714	0–9 XXXall 10 · 5 holders which blocks →	COMCAST IP PHONE, LLC	318J	EVANSTON	IL
2014-10-24	224-479	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	NORTHBROOK	IL
2014-10-24	224-480	0–9 XXXall 10 · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	WAUKEGAN	IL
2014-10-24	224-503	0–9 XXXwhole prefix which blocks →	T-MOBILE USA, INC.	6529	NORTHBROOK	IL
2014-10-08	224-434	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	WHEELING	IL
2014-10-01	224-478	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IL	6115	DESPLAINES	IL
2014-09-29	224-339	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	ELGIN	IL
2014-09-29	224-443	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	DESPLAINES	IL
2014-09-16	224-470	0–9 XXXall 10 · 6 holders which blocks →	COMCAST IP PHONE, LLC	318J	SKOKIE	IL
2014-09-02	224-386	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	PALATINE	IL
2014-08-26	224-760	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	ELGIN	IL
2014-07-25	224-830	0–9 XXXwhole prefix which blocks →	T-MOBILE USA, INC.	6529	ARLIGTNHTS	IL
2014-07-21	224-508	0–9 XXXwhole prefix which blocks →	T-MOBILE USA, INC.	6529	ELGIN	IL
2014-07-16	224-818	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	ROUND LAKE	IL
2014-07-01	224-268	0–9 XXXall 10 · 4 holders which blocks →	METROPCS, INC.	5562	ELGIN	IL
2014-06-18	224-732	0–9 XXXall 10 · 6 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	WAUCONDA	IL
2014-06-11	224-385	0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	T-MOBILE USA, INC.	6529	BARRINGTON	IL

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.