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
—	309-521	not yet reported which blocks →	CAMBRIDGE TEL. CO.	0983	ANDOVER	IL
—	309-522	not yet reported which blocks →	CAMBRIDGE TEL. CO.	0983	OSCO	IL
—	309-523	not yet reported which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	PORT BYRON	IL
—	309-524	0–9 XXXall 10 · 4 holders which blocks →	ILLINOIS BELL TEL CO	9329	MOLINE	IL
—	309-525	8XXX which blocks →	UNITED STATES CELLULAR - IL	6265	KEWANEE	IL
—	309-526	not yet reported which blocks →	FRONTIER COMMUNICATIONS OF ORION, INC.	1067	ORION	IL
—	309-527	not yet reported which blocks →	CONSOLIDATED COMMUNICATIONS OF CENTRAL ILLINOIS	1004	EL PASO	IL
—	309-528	not yet reported which blocks →	AMERICAN MESSAGING SERVICES, LLC	9748	BLOOMINGTN	IL
—	309-529	1XXX3XXX7XXX · 2 holders which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	ALPHA	IL
—	309-530	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	BLOOMINGTN	IL
—	309-531	5XXX6XXX which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	BLOOMINGTN	IL
—	309-532	5XXX6XXX8XXX · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	BLOOMINGTN	IL
—	309-533	4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	BLOOMINGTN	IL
—	309-534	not yet reported which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	PREEMPTION	IL
—	309-535	6XXX which blocks →	BRIGHTSPEED OF ILLINOIS, LLC	1057	TOPEKA	IL
—	309-537	4XXX5XXX6XXX · 3 holders which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	ELIZA	IL
—	309-538	not yet reported which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	KILBOURNE	IL
—	309-542	0XXX1XXX5XXX6XXX · 4 holders which blocks →	ONVOY SPECTRUM, LLC	624H	MCLEAN	IL
—	309-543	5XXX9XXX · 2 holders which blocks →	BRIGHTSPEED OF ILLINOIS, LLC	1057	HAVANA	IL
—	309-544	4XXX which blocks →	SKYE TELECOM LLC DBA SKYETEL	622J	MACOMB	IL
—	309-545	4XXX which blocks →	BRIGHTSPEED OF ILLINOIS, LLC	1057	TALBOTT	IL
—	309-546	not yet reported which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	BATH	IL
—	309-547	0XXX4XXX8XXX · 3 holders which blocks →	ILLINOIS BELL TEL CO	9329	LEWISTOWN	IL
—	309-555	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	DIR ASST	IL
—	309-556	not yet reported which blocks →	FRONTIER NORTH, INC. - IL	1015	BLOOMINGTN	IL
—	309-557	none assigned yet which blocks →	FRONTIER NORTH, INC. - IL	1015	BLOOMINGTN	IL
—	309-558	0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	ILLINOIS BELL TEL CO	9329	ROCKISLAND	IL
—	309-562	not yet reported which blocks →	CASS TELEPHONE COMPANY	0984	EASTON	IL
—	309-563	8XXX which blocks →	BRIGHTSPEED OF ILLINOIS, LLC	1057	CAMERON	IL
—	309-565	0XXX1XXX3XXX5XXX8XXX · 5 holders which blocks →	ILLINOIS BELL TEL CO	9329	HANNA CITY	IL
—	309-566	0XXX9XXX · 2 holders which blocks →	ILLINOIS BELL TEL CO	9329	PEORIA	IL
—	309-567	0–9 XXXall 10 · 2 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL	7196	PEORIA	IL
—	309-568	1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	ONVOY, LLC	224C	ANDOVER	IL
—	309-572	not yet reported which blocks →	FRONTIER NORTH, INC. - IL	1015	MOSSVILLE	IL
—	309-573	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - IL	7136	PEORIA	IL
—	309-576	3XXX which blocks →	FRONTIER NORTH, INC. - IL	1015	MOSSVILLE	IL
—	309-577	not yet reported which blocks →	FRONTIER NORTH, INC. - IL	1015	MOSSVILLE	IL
—	309-578	not yet reported which blocks →	FRONTIER NORTH, INC. - IL	1015	MOSSVILLE	IL
—	309-579	0XXX1XXX4XXX5XXX6XXX9XXX · 5 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	MOSSVILLE	IL
—	309-582	none assigned yet which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	ALEDO	IL
—	309-584	5XXX6XXX7XXX · 3 holders which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	JOY	IL
—	309-586	2XXX3XXX · 2 holders which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	SEATON	IL
—	309-587	4XXX5XXX6XXX · 3 holders which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	NEW BOSTON	IL
—	309-589	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	PEORIA	IL
—	309-593	not yet reported which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	SHERRARD	IL
—	309-594	0XXX1XXX3XXX5XXX7XXX8XXX · 6 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	NEPONSET	IL
—	309-596	not yet reported which blocks →	VIOLA HOME TEL. CO.	1087	VIOLA	IL
—	309-597	8XXX which blocks →	BRIGHTSPEED OF ILLINOIS, LLC	1057	FORESTCITY	IL
—	309-602	0XXX1XXX2XXX6XXX7XXX · 3 holders which blocks →	ONVOY, LLC	224C	SHERRARD	IL
—	309-611	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	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.