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
—	309-431	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IL	6115	PEORIA	IL
—	309-432	0XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	MINONK	IL
—	309-433	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks →	SKYE TELECOM LLC DBA SKYETEL	622J	BLOOMINGTN	IL
—	309-434	0XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	BLOOMINGTN	IL
—	309-436	not yet reported which blocks →	FRONTIER NORTH, INC. - IL	1015	BLOOMINGTN	IL
—	309-437	0–9 XXXwhole prefix which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IL	6115	PEORIA	IL
—	309-438	not yet reported which blocks →	FRONTIER NORTH, INC. - IL	1015	BLOOMINGTN	IL
—	309-439	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IL	6115	PEORIA	IL
—	309-441	not yet reported which blocks →	GENESEO TEL. CO.	1016	GREENRIVER	IL
—	309-443	0XXX2XXX3XXX4XXX8XXX · 4 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	LOW POINT	IL
—	309-444	0XXX6XXX which blocks →	FRONTIER NORTH, INC. - IL	1015	WASHINGTON	IL
—	309-446	1XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	BRIMFIELD	IL
—	309-447	0XXX4XXX5XXX7XXX8XXX · 3 holders which blocks →	FRONTIER COMMUNICATIONS OF THE CAROLINAS, INC - IL	1000	DEER CREEK	IL
—	309-448	3XXX4XXX6XXX7XXX8XXX · 3 holders which blocks →	FRONTIER COMMUNICATIONS OF THE CAROLINAS, INC - IL	1000	CONGERVL	IL
—	309-449	0XXX1XXX2XXX7XXX8XXX9XXX · 6 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	HOPEDALE	IL
—	309-451	not yet reported which blocks →	FRONTIER NORTH, INC. - IL	1015	BLOOMINGTN	IL
—	309-452	not yet reported which blocks →	FRONTIER NORTH, INC. - IL	1015	BLOOMINGTN	IL
—	309-453	none assigned yet which blocks →	T-MOBILE USA, INC.	6529	PEORIA	IL
—	309-454	not yet reported which blocks →	FRONTIER NORTH, INC. - IL	1015	BLOOMINGTN	IL
—	309-456	not yet reported which blocks →	MCDONOUGH TEL. COOP.	1047	GOOD HOPE	IL
—	309-457	not yet reported which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	MONMOUTH	IL
—	309-458	not yet reported which blocks →	ADAMS TEL. COOP.	0976	PLYMOUTH	IL
—	309-462	not yet reported which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	ABINGDON	IL
—	309-463	0XXX3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	VARNA	IL
—	309-464	2XXX3XXX4XXX · 2 holders which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	NOHENDERSN	IL
—	309-465	not yet reported which blocks →	BRIGHTSPEED OF ILLINOIS, LLC	1057	AVON	IL
—	309-467	1XXX8XXX · 2 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	EUREKA	IL
—	309-469	0XXX4XXX6XXX7XXX8XXX · 4 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	SPARLAND	IL
—	309-470	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	PEORIA	IL
—	309-471	1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks →	ONVOY, LLC	224C	SPARLAND	IL
—	309-472	none assigned yet which blocks →	T-MOBILE USA, INC.	6529	PEORIA	IL
—	309-473	0XXX1XXX5XXX8XXX · 4 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	HEYWORTH	IL
—	309-475	1XXX7XXX8XXX · 3 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	SAYBROOK	IL
—	309-476	not yet reported which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	ANDOVER	IL
—	309-477	not yet reported which blocks →	BRIGHTSPEED OF ILLINOIS, LLC	1057	PEKIN	IL
—	309-478	not yet reported which blocks →	BRIGHTSPEED OF ILLINOIS, LLC	1057	PEKIN	IL
—	309-479	0XXX1XXX4XXX5XXX · 4 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	CASTLETON	IL
—	309-482	not yet reported which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	ALEXIS	IL
—	309-483	not yet reported which blocks →	ONEIDA TEL. EXCH.	1066	ONEIDA	IL
—	309-484	not yet reported which blocks →	MID CENTURY TEL. COOP., INC.	1054	ALTONA	IL
—	309-486	not yet reported which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	LONDON ML	IL
—	309-493	8XXX which blocks →	FRONTIER NORTH, INC. - IL	1015	CAMPGROVE	IL
—	309-494	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	PEORIA	IL
—	309-495	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	PEORIA	IL
—	309-496	not yet reported which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	HAMPTON	IL
—	309-497	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	PEORIA	IL
—	309-507	4XXX6XXX8XXX9XXX · 3 holders which blocks →	UNITED STATES CELLULAR - IL	6265	GENESEO	IL
—	309-510	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	PEORIA	IL
—	309-511	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	IL
—	309-517	0–9 XXXall 10 · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IL	6115	MOLINE	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.