Recent prefix assignments

2 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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 309

ONVOY, LLC 1

AHOI LLC 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
2015-03-09	309-430	0–9 XXXall 10 · 5 holders which blocks →	GENESEO COMMUNICATIONS SERVICES, INC. - IL	8790	ROCKISLAND	IL
2015-03-05	309-601	not yet reported which blocks →	ONVOY, LLC	224C	MOLINE	IL
2015-03-05	309-607	not yet reported which blocks →	ONVOY, LLC	224C	ROCKISLAND	IL
2015-02-25	309-777	0–9 XXXall 10 · 3 holders which blocks →	PEERLESS NETWORK OF ILLINOIS, LLC - IL	063E	IPAVA	IL
2015-01-21	309-715	not yet reported which blocks →	MTC COMMUNICATIONS, INC. - IL	342F	MONMOUTH	IL
2014-03-05	309-315	0–9 XXXall 10 · 6 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	GALESBURG	IL
2014-02-26	309-205	0–9 XXXall 10 · 6 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	BLOOMINGTN	IL
2013-03-13	309-209	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks →	NUSO, LLC	551G	MACOMB	IL
2013-03-13	309-307	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks →	NUSO, LLC	551G	BLOOMINGTN	IL
2013-03-13	309-308	0–9 XXXall 10 · 2 holders which blocks →	NUSO, LLC	551G	PEORIA	IL
2012-09-28	309-201	0–9 XXXall 10 · 5 holders which blocks →	UNITED STATES CELLULAR - IL	6265	PEKIN	IL
2011-12-21	309-425	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks →	AT&T ENTERPRISES, LLC	516C	FIATT	IL
2011-11-03	309-203	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	EASTMOLINE	IL
2011-08-11	309-429	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	ROCKISLAND	IL
2011-07-19	309-206	0–9 XXXall 10 · 5 holders which blocks →	ILLINOIS BELL TEL CO	9329	ROCKISLAND	IL
2011-06-14	309-306	0–9 XXXall 10 · 2 holders which blocks →	PEERLESS NETWORK OF ILLINOIS, LLC - IL	063E	PEORIA	IL
2011-04-26	309-300	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	SOUTHPEKIN	IL
2011-02-17	309-200	0–9 XXXall 10 · 3 holders which blocks →	YMAX COMMUNICATIONS CORP. - IL	259E	BLOOMINGTN	IL
2010-12-01	309-575	not yet reported which blocks →	MTC COMMUNICATIONS, INC. - IL	342F	MACOMB	IL
2010-10-20	309-340	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	PEORIA	IL
2010-09-22	309-323	0–9 XXXall 10 · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IL	984E	PEORIA	IL
2010-09-17	309-435	0XXX1XXX2XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks →	AT&T ENTERPRISES, LLC	516C	CANTON	IL
2010-03-09	309-281	0–9 XXXall 10 · 4 holders which blocks →	MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL	846F	EASTMOLINE	IL
2010-01-12	309-603	0–9 XXXall 10 · 6 holders which blocks →	MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL	846F	CHILLICOTH	IL
2009-12-17	309-326	0–9 XXXall 10 · 7 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - IL	7136	CANTON	IL
2009-06-10	309-445	0–9 XXXall 10 · 3 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - IL	7136	BLOOMINGTN	IL
2009-06-10	309-864	0XXX6XXX8XXX · 2 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - IL	7136	MACOMB	IL
2009-04-06	309-857	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC	224C	PEORIA	IL
2008-12-15	309-981	0–9 XXXall 10 · 6 holders which blocks →	ONVOY, LLC	224C	PEORIA	IL
2008-09-08	309-428	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	ROCKISLAND	IL
2008-09-04	309-847	not yet reported which blocks →	T-MOBILE USA, INC.	6529	KEWANEE	IL
2008-06-03	309-388	1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	COMCAST IP PHONE, LLC	318J	KNOXVILLE	IL
2008-05-27	309-421	0XXX1XXX3XXX9XXX · 2 holders which blocks →	COMCAST IP PHONE, LLC	318J	MACOMB	IL
2008-05-15	309-583	not yet reported which blocks →	COMCAST IP PHONE, LLC	318J	NORTHPEKIN	IL
2008-02-20	309-569	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	BUSHNELL	IL
2007-08-08	309-585	0–9 XXXall 10 · 4 holders which blocks →	COMCAST IP PHONE, LLC	318J	BLOOMINGTN	IL
2007-08-08	309-839	0–9 XXXall 10 · 4 holders which blocks →	COMCAST IP PHONE, LLC	318J	PEORIA	IL
2007-06-27	309-581	0–9 XXXall 10 · 6 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - IL	7136	MOLINE	IL
2007-06-14	309-620	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	PEKIN	IL
2007-06-05	309-349	0–9 XXXall 10 · 7 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	PEKIN	IL
2007-06-05	309-884	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - IL	7136	HANNA CITY	IL
2006-09-12	309-992	0–9 XXXall 10 · 3 holders which blocks →	ILLINOIS BELL TEL CO	9329	PEORIA	IL
2006-08-25	309-808	0–9 XXXall 10 · 4 holders which blocks →	COMCAST IP PHONE, LLC	318J	BLOOMINGTN	IL
2006-07-21	309-889	0–9 XXXall 10 · 5 holders which blocks →	AT&T ENTERPRISES, LLC	516C	SPRING BAY	IL
2006-06-23	309-966	0–9 XXXall 10 · 3 holders which blocks →	COMCAST IP PHONE, LLC	318J	PEORIA	IL
2006-06-06	309-703	0–9 XXXall 10 · 5 holders which blocks →	MCC TELEPHONY LLC	593K	ABINGDON	IL
2006-06-06	309-997	0XXX1XXX2XXX8XXX · 2 holders which blocks →	MCC TELEPHONY LLC	593K	GOOD HOPE	IL
2006-05-16	309-600	0XXX1XXX3XXX6XXX7XXX · 4 holders which blocks →	MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL	846F	PREEMPTION	IL
2006-05-04	309-559	0XXX1XXX5XXX7XXX9XXX · 4 holders which blocks →	MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL	846F	OQUAWKA	IL
2006-05-03	309-855	1XXX5XXX8XXX · 3 holders which blocks →	MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL	846F	FAIRVIEW	IL

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.