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
2014-06-11	224-713	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	ALGONQUIN	IL
2014-06-11	224-817	0–9 XXXwhole prefix which blocks →	T-MOBILE USA, INC.	6529	ALGONQUIN	IL
2014-05-08	224-665	0–9 XXXwhole prefix which blocks →	ILLINOIS BELL TEL CO	9329	WAUKEGAN	IL
2014-05-05	224-347	0–9 XXXall 10 · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL	7196	ARLIGTNHTS	IL
2014-04-25	224-442	0–9 XXXall 10 · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IL	984E	FRANKLINPK	IL
2014-04-02	224-661	0–9 XXXall 10 · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IL	984E	GLENVIEW	IL
2014-04-02	224-662	0–9 XXXall 10 · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IL	984E	LAKEZURICH	IL
2014-03-28	224-257	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC	224C	DESPLAINES	IL
2014-03-25	224-352	0–9 XXXall 10 · 6 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	HALF DAY	IL
2014-03-25	224-423	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	DESPLAINES	IL
2014-03-05	224-334	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	ARLIGTNHTS	IL
2014-01-28	224-774	0XXX1XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	T-MOBILE USA, INC.	6529	ZION	IL
2014-01-27	224-707	0–9 XXXall 10 · 3 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IL	984E	HIGHLANDPK	IL
2014-01-23	224-706	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IL	984E	LAKEFOREST	IL
2013-12-31	224-667	0–9 XXXwhole prefix which blocks →	ILLINOIS BELL TEL CO	9329	WAUKEGAN	IL
2013-12-31	224-668	0–9 XXXwhole prefix which blocks →	ILLINOIS BELL TEL CO	9329	WAUKEGAN	IL
2013-12-24	224-701	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IL	984E	LAKE VILLA	IL
2013-12-24	224-702	0–9 XXXall 10 · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IL	984E	ZION	IL
2013-11-15	224-704	0–9 XXXall 10 · 2 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IL	984E	ALGONQUIN	IL
2013-11-12	224-703	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	ALGONQUIN	IL
2013-10-16	224-281	0–9 XXXall 10 · 5 holders which blocks →	T-MOBILE USA, INC.	6529	ELGIN	IL
2013-09-20	224-814	0–9 XXXall 10 · 6 holders which blocks →	T-MOBILE USA, INC.	6529	ROUND LAKE	IL
2013-08-02	224-249	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC	224C	ALGONQUIN	IL
2013-07-18	224-412	0–9 XXXall 10 · 6 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	NORTHBROOK	IL
2013-07-09	224-336	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	NORTHBROOK	IL
2013-07-09	224-413	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	WAUKEGAN	IL
2013-07-09	224-415	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	NORTHBROOK	IL
2013-07-09	224-432	0–9 XXXall 10 · 6 holders which blocks →	T-MOBILE USA, INC.	6529	GLENVIEW	IL
2013-06-25	224-252	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IL	984E	GRAYSLAKE	IL
2013-06-25	224-253	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	ALGONQUIN	IL
2013-06-21	224-248	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	ARLIGTNHTS	IL
2013-06-13	224-806	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	ELGIN	IL
2013-06-12	224-804	0–9 XXXall 10 · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IL	984E	DEERFIELD	IL
2013-06-07	224-801	0–9 XXXall 10 · 6 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	PALATINE	IL
2013-06-07	224-802	0–9 XXXall 10 · 5 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	DUNDEE	IL
2013-06-04	224-813	0–9 XXXall 10 · 5 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	DEERFIELD	IL
2013-05-24	224-409	0–9 XXXwhole prefix which blocks →	T-MOBILE USA, INC.	6529	ARLIGTNHTS	IL
2013-05-24	224-410	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	ALGONQUIN	IL
2013-04-30	224-408	0–9 XXXall 10 · 6 holders which blocks →	COMCAST IP PHONE, LLC	318J	WILMETTE	IL
2013-04-23	224-326	0–9 XXXall 10 · 3 holders which blocks →	COMCAST IP PHONE, LLC	318J	NORTHBROOK	IL
2013-04-18	224-247	0–9 XXXwhole prefix which blocks →	T-MOBILE USA, INC.	6529	ARLIGTNHTS	IL
2013-04-18	224-427	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	BARRINGTON	IL
2013-04-10	224-864	0–9 XXXall 10 · 5 holders which blocks →	PEERLESS NETWORK OF ILLINOIS, LLC - IL	063E	MUNDELEIN	IL
2013-04-10	224-901	0–9 XXXall 10 · 5 holders which blocks →	PEERLESS NETWORK OF ILLINOIS, LLC - IL	063E	PISTAKHLDS	IL
2013-03-19	224-337	0–9 XXXall 10 · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	FOX LAKE	IL
2013-02-19	224-240	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	DESPLAINES	IL
2013-02-19	224-407	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	ELGIN	IL
2013-01-15	224-401	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	ALGONQUIN	IL
2013-01-15	224-404	0–9 XXXall 10 · 7 holders which blocks →	ILLINOIS BELL TEL CO	9329	ELK GROVE	IL
2013-01-03	224-318	0–9 XXXall 10 · 5 holders which blocks →	COMCAST IP PHONE, LLC	318J	ARLIGTNHTS	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.