Recent prefix assignments

341 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/26/2026

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

8X8, INC. 43

NEW CINGULAR WIRELESS PCS, LLC - DC 26

Rogers Communications Canada Inc. (Wireless) 23

NEW CINGULAR WIRELESS PCS, LLC - IL 22

ONVOY, LLC - CA 21

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
—	815-729	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	JOLIET	IL
—	815-730	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	JOLIET	IL
—	815-732	8XXX which blocks →	FRONTIER NORTH, INC. - IL	1036	OREGON	IL
—	815-733	0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks →	RCN TELECOM SERVICES OF ILLINIOS, INC. - IL	8702	PLAINFIELD	IL
—	815-734	2XXX3XXX · 2 holders which blocks →	FRONTIER NORTH, INC. - IL	1036	MT MORRIS	IL
—	815-735	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	JOLIET	IL
—	815-736	0XXX1XXX2XXX4XXX5XXX7XXX9XXX · 5 holders which blocks →	ILLINOIS BELL TEL CO	9329	LISBON	IL
—	815-737	not yet reported which blocks →	SHARON TEL. CO. - IL	1080	SO SHARON	IL
—	815-738	not yet reported which blocks →	LEAF RIVER TELEPHONE CO.	1045	LEAF RIVER	IL
—	815-739	none assigned yet which blocks →	METROPCS, INC.	5562	SYCAMORE	IL
—	815-740	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	JOLIET	IL
—	815-741	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	JOLIET	IL
—	815-742	none assigned yet which blocks →	UNITED STATES CELLULAR - IL	6265	ROCKFORD	IL
—	815-743	2XXX3XXX4XXX · 2 holders which blocks →	FRONTIER COMMUNICATIONS-PRAIRIE, INC.	1073	GRAYMONT	IL
—	815-744	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	JOLIET	IL
—	815-745	0XXX1XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks →	FRONTIER NORTH, INC. - IL	1036	WARREN	IL
—	815-747	not yet reported which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	E DUBUQUE	IL
—	815-748	not yet reported which blocks →	FRONTIER NORTH, INC. - IL	1036	DE KALB	IL
—	815-751	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	DE KALB	IL
—	815-752	not yet reported which blocks →	FRONTIER NORTH, INC. - IL	1036	DE KALB	IL
—	815-753	not yet reported which blocks →	FRONTIER NORTH, INC. - IL	1036	DE KALB	IL
—	815-754	not yet reported which blocks →	FRONTIER NORTH, INC. - IL	1036	DE KALB	IL
—	815-756	0XXX which blocks →	FRONTIER NORTH, INC. - IL	1036	DE KALB	IL
—	815-757	none assigned yet which blocks →	UNITED STATES CELLULAR - IL	6265	DE KALB	IL
—	815-758	not yet reported which blocks →	FRONTIER NORTH, INC. - IL	1036	DE KALB	IL
—	815-759	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	MCHENRY	IL
—	815-761	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	DE KALB	IL
—	815-762	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	DE KALB	IL
—	815-764	2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	UNITED STATES CELLULAR - IL	6265	DE KALB	IL
—	815-765	4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	POPLAR GRV	IL
—	815-766	3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	UNITED STATES CELLULAR - IL	6265	DE KALB	IL
—	815-768	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks →	ILLINOIS BELL TEL CO	9329	JOLIET	IL
—	815-771	0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	RCN TELECOM SERVICES OF ILLINIOS, INC. - IL	8702	ASHKUM	IL
—	815-772	not yet reported which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	MORRISON	IL
—	815-773	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	JOLIET	IL
—	815-774	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	JOLIET	IL
—	815-775	not yet reported which blocks →	SPOK, INC.	6630	WOODSTOCK	IL
—	815-776	none assigned yet which blocks →	ILLINOIS BELL TEL CO	9329	GALENA	IL
—	815-777	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	GALENA	IL
—	815-778	not yet reported which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	LYNDON	IL
—	815-781	1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	RCN TELECOM SERVICES OF ILLINIOS, INC. - IL	8702	CHEBANSE	IL
—	815-782	0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IL	6115	PLAINFIELD	IL
—	815-783	0XXX2XXX5XXX6XXX7XXX · 3 holders which blocks →	RCN TELECOM SERVICES OF ILLINIOS, INC. - IL	8702	GILMAN	IL
—	815-784	0XXX which blocks →	FRONTIER NORTH, INC. - IL	1036	GENOA	IL
—	815-785	0XXX1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 8 holders which blocks →	RCN TELECOM SERVICES OF ILLINIOS, INC. - IL	8702	WATSEKA	IL
—	815-786	0XXX which blocks →	FRONTIER NORTH, INC. - IL	1015	SANDWICH	IL
—	815-787	not yet reported which blocks →	FRONTIER NORTH, INC. - IL	1036	DE KALB	IL
—	815-789	0XXX1XXX2XXX5XXX6XXX7XXX8XXX · 6 holders which blocks →	FRONTIER NORTH, INC. - IL	1036	ORANGEVL	IL
—	815-790	none assigned yet which blocks →	T-MOBILE USA, INC.	6529	WOODSTOCK	IL
—	815-792	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 7 holders which blocks →	ILLINOIS BELL TEL CO	9329	HARDING	IL

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.