Recent prefix assignments

2 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 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
—	309-862	not yet reported which blocks →	FRONTIER NORTH, INC. - IL	1015	BLOOMINGTN	IL
—	309-865	0–9 XXXall 10 · 4 holders which blocks →	TELNYX LLC	073H	EASTMOLINE	IL
—	309-867	not yet reported which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	OQUAWKA	IL
—	309-872	6XXX7XXX · 2 holders which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	RIO	IL
—	309-873	3XXX4XXX5XXX · 3 holders which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	GULFPORT	IL
—	309-874	4XXX9XXX · 2 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	MCLEAN	IL
—	309-875	not yet reported which blocks →	MID CENTURY TEL. COOP., INC.	1054	MAQUON	IL
—	309-876	not yet reported which blocks →	MID CENTURY TEL. COOP., INC.	1054	GILSON	IL
—	309-879	not yet reported which blocks →	MID CENTURY TEL. COOP., INC.	1054	VICTORIA	IL
—	309-886	0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	WASHINGTON	IL
—	309-887	not yet reported which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	ALBANY	IL
—	309-888	not yet reported which blocks →	FRONTIER NORTH, INC. - IL	1015	BLOOMINGTN	IL
—	309-895	3XXX which blocks →	FRONTIER NORTH, INC. - IL	1015	BUDA	IL
—	309-896	0XXX1XXX2XXX7XXX · 4 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	ELMIRA	IL
—	309-897	0XXX3XXX5XXX · 3 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	BRADFORD	IL
—	309-911	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	IL
—	309-921	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks →	ONVOY, LLC	224C	ROANOKE	IL
—	309-923	0XXX3XXX4XXX · 3 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	ROANOKE	IL
—	309-924	not yet reported which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	STRONGHST	IL
—	309-925	0XXX1XXX8XXX · 3 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	TREMONT	IL
—	309-926	not yet reported which blocks →	MID CENTURY TEL. COOP., INC.	1054	MARIETTA	IL
—	309-927	not yet reported which blocks →	MID CENTURY TEL. COOP., INC.	1054	BISHOPHILL	IL
—	309-928	0XXX1XXX4XXX7XXX8XXX · 4 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	FARMERCITY	IL
—	309-932	0XXX1XXX4XXX5XXX6XXX7XXX · 5 holders which blocks →	FRONTIER NORTH, INC. - IL	1036	GALVA	IL
—	309-934	5XXX which blocks →	HENRY COUNTY TEL. CO.	1029	ANNAWAN	IL
—	309-935	not yet reported which blocks →	HENRY COUNTY TEL. CO.	1029	ANNAWAN	IL
—	309-936	not yet reported which blocks →	HENRY COUNTY TEL. CO.	1029	ATKINSON	IL
—	309-937	not yet reported which blocks →	CAMBRIDGE TEL. CO.	0983	CAMBRIDGE	IL
—	309-939	2XXX3XXX4XXX8XXX · 3 holders which blocks →	TWILIO INTERNATIONAL, INC.	506J	ASTORIA	IL
—	309-944	none assigned yet which blocks →	GENESEO TEL. CO.	1016	GENESEO	IL
—	309-945	none assigned yet which blocks →	GENESEO TEL. CO.	1016	GENESEO	IL
—	309-949	not yet reported which blocks →	GENESEO TEL. CO.	1016	GREENRIVER	IL
—	309-950	not yet reported which blocks →				IL
—	309-955	0–9 XXXall 10 · 6 holders which blocks →	TWILIO INTERNATIONAL, INC.	506J	WATAGA	IL
—	309-958	not yet reported which blocks →				IL
—	309-959	not yet reported which blocks →				IL
—	309-962	none assigned yet which blocks →	FRONTIER NORTH, INC. - IL	1015	LE ROY	IL
—	309-963	not yet reported which blocks →	FRONTIER COMMUNICATIONS OF ILLINOIS, INC.	1038	DANVERS	IL
—	309-965	0XXX3XXX4XXX6XXX9XXX · 5 holders which blocks →	FRONTIER COMMUNICATIONS OF THE CAROLINAS, INC - IL	1000	GOODFIELD	IL
—	309-968	8XXX which blocks →	BRIGHTSPEED OF ILLINOIS, LLC	1057	MANITO	IL
—	309-972	not yet reported which blocks →	ONEIDA NETWORK SERVICES, INC.	4624	RIO	IL
—	309-973	0XXX1XXX2XXX3XXX4XXX6XXX9XXX · 6 holders which blocks →	UNITED STATES CELLULAR - IL	6265	GALESBURG	IL
—	309-975	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks →	ONVOY, LLC	224C	AVON	IL
—	309-976	not yet reported which blocks →				IL
—	309-977	0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL	846F	GREEN VLY	IL
—	309-988	0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 8 holders which blocks →	ONVOY, LLC	224C	LACON	IL
—	309-989	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	PEORIA	IL
—	309-994	not yet reported which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	BLOOMINGTN	IL
—	309-995	not yet reported which blocks →	MID CENTURY TEL. COOP., INC.	1054	LA FAYETTE	IL
—	309-999	7XXX which blocks →	ILLINOIS BELL TEL CO	9329	PEORIA	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.