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
2012-10-19	224-316	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	NORTHBROOK	IL
2012-10-15	224-315	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	DESPLAINES	IL
2012-09-28	224-228	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	ONVOY, LLC	224C	BARRINGTON	IL
2012-09-27	224-307	0–9 XXXall 10 · 6 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	EVANSTON	IL
2012-09-06	224-231	0–9 XXXall 10 · 5 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - IL	7136	ROSELLE	IL
2012-09-06	224-601	0–9 XXXall 10 · 8 holders which blocks →	ILLINOIS BELL TEL CO	9329	SKOKIE	IL
2012-09-05	224-301	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	DESPLAINES	IL
2012-08-10	224-256	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	ALGONQUIN	IL
2012-08-07	224-501	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	NORTHBROOK	IL
2012-07-13	224-302	0–9 XXXall 10 · 7 holders which blocks →	ILLINOIS BELL TEL CO	9329	WAUKEGAN	IL
2012-07-05	224-303	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	WAUKEGAN	IL
2012-05-02	224-308	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	ROUND LAKE	IL
2012-04-27	224-251	0–9 XXXall 10 · 4 holders which blocks →	ILLINOIS BELL TEL CO	9329	SKOKIE	IL
2012-04-20	224-215	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IL	6115	WILMETTE	IL
2012-04-10	224-324	0–9 XXXall 10 · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	ARLIGTNHTS	IL
2012-01-23	224-803	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	NORTHBROOK	IL
2011-12-19	224-214	0–9 XXXall 10 · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	WAUKEGAN	IL
2011-11-15	224-209	0–9 XXXall 10 · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	ALGONQUIN	IL
2011-11-03	224-205	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	NORTHBROOK	IL
2011-10-24	224-541	0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	ILLINOIS BELL TEL CO	9329	GRAYSLAKE	IL
2011-09-21	224-229	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	DESPLAINES	IL
2011-09-17	224-203	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	NORTHBROOK	IL
2011-09-13	224-254	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	DESPLAINES	IL
2011-09-08	224-226	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	NORTHBROOK	IL
2011-09-08	224-261	0–9 XXXall 10 · 5 holders which blocks →	T-MOBILE USA, INC.	6529	NORTHBROOK	IL
2011-08-11	224-246	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	NORTHBROOK	IL
2011-08-11	224-250	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	DESPLAINES	IL
2011-07-22	224-255	0–9 XXXall 10 · 6 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	WINNETKA	IL
2011-07-21	224-245	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	ARLIGTNHTS	IL
2011-07-19	224-242	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	ELGIN	IL
2011-07-18	224-237	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	WAUKEGAN	IL
2011-07-11	224-235	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	NORTHBROOK	IL
2011-07-11	224-236	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IL	984E	BARTLETT	IL
2011-05-25	224-230	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	ELGIN	IL
2011-05-23	224-880	0–9 XXXall 10 · 7 holders which blocks →	ILLINOIS BELL TEL CO	9329	LAKEFOREST	IL
2011-05-02	224-227	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	ELGIN	IL
2011-03-22	224-900	0–9 XXXall 10 · 6 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	WHEELING	IL
2011-03-03	224-733	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	WAUKEGAN	IL
2011-03-03	224-800	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	ARLIGTNHTS	IL
2011-02-10	224-600	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	ALGONQUIN	IL
2011-01-12	224-500	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	DESPLAINES	IL
2010-10-13	224-239	0–9 XXXwhole prefix which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	ELGIN	IL
2010-10-04	224-276	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	ELGIN	IL
2010-09-22	224-999	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IL	6115	EVANSTON	IL
2010-09-02	224-277	0–9 XXXwhole prefix which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	NORTHBROOK	IL
2010-08-17	224-360	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IL	984E	MUNDELEIN	IL
2010-08-10	224-358	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	MUNDELEIN	IL
2010-08-04	224-279	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	WHEELING	IL
2010-08-03	224-888	0–9 XXXall 10 · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IL	6115	CARY	IL
2010-06-30	224-419	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	WAUKEGAN	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.