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
—	815-659	4XXX5XXX8XXX9XXX · 4 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	BUREAU	IL
—	815-660	0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	RCN TELECOM SERVICES OF ILLINIOS, INC. - IL	8702	LOCKPORT	IL
—	815-661	0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	RCN TELECOM SERVICES OF ILLINIOS, INC. - IL	8702	MORRIS	IL
—	815-662	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IL	6115	MOMENCE	IL
—	815-663	7XXX8XXX9XXX · 2 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	SPRING VLY	IL
—	815-664	0XXX3XXX6XXX8XXX · 4 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	SPRING VLY	IL
—	815-665	0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks →	RCN TELECOM SERVICES OF ILLINIOS, INC. - IL	8702	OTTAWA	IL
—	815-667	0XXX1XXX8XXX · 3 holders which blocks →	ILLINOIS BELL TEL CO	9329	UTICA	IL
—	815-669	0XXX1XXX2XXX5XXX6XXX9XXX · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IL	6115	MCHENRY	IL
—	815-670	0XXX2XXX which blocks →	T-MOBILE USA, INC.	6529	ROCKFORD	IL
—	815-671	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IL	6115	JOLIET	IL
—	815-672	not yet reported which blocks →	FRONTIER NORTH, INC. - IL	1015	STREATOR	IL
—	815-673	0XXX7XXX8XXX9XXX · 2 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	STREATOR	IL
—	815-674	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	STREATOR	IL
—	815-675	5XXX which blocks →	FRONTIER NORTH, INC. - IL	1015	SPRING GRV	IL
—	815-676	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IL	6115	PLAINFIELD	IL
—	815-678	9XXX which blocks →	FRONTIER NORTH, INC. - IL	1015	RICHMOND	IL
—	815-679	4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	RCN TELECOM SERVICES OF ILLINIOS, INC. - IL	8702	MCHENRY	IL
—	815-680	0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	RCN TELECOM SERVICES OF ILLINIOS, INC. - IL	8702	MANHATTAN	IL
—	815-682	0XXX1XXX2XXX5XXX6XXX7XXX · 5 holders which blocks →	FRONTIER COMMUNICATIONS OF THE CAROLINAS, INC - IL	1000	STOCKLAND	IL
—	815-683	0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks →	ILLINOIS BELL TEL CO	9329	CRESCENTCY	IL
—	815-684	not yet reported which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	CHADWICK	IL
—	815-685	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	JOLIET	IL
—	815-686	1XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	PIPER CITY	IL
—	815-687	0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	RCN TELECOM SERVICES OF ILLINIOS, INC. - IL	8702	WOODSTOCK	IL
—	815-688	1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	STRAWN	IL
—	815-689	not yet reported which blocks →	FRONTIER COMMUNICATIONS OF ILLINOIS, INC.	1038	CULLOM	IL
—	815-690	none assigned yet which blocks →	T-MOBILE USA, INC.	6529	JOLIET	IL
—	815-691	0XXX1XXX2XXX5XXX6XXX8XXX9XXX · 5 holders which blocks →	RCN TELECOM SERVICES OF ILLINIOS, INC. - IL	8702	UTICA	IL
—	815-692	0XXX1XXX5XXX8XXX9XXX · 5 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	FAIRBURY	IL
—	815-693	none assigned yet which blocks →	T-MOBILE USA, INC.	6529	JOLIET	IL
—	815-694	0XXX4XXX6XXX7XXX9XXX · 3 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	CLIFTON	IL
—	815-695	0XXX2XXX6XXX · 3 holders which blocks →	ILLINOIS BELL TEL CO	9329	NEWARK	IL
—	815-697	0XXX1XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	CHEBANSE	IL
—	815-698	0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	ASHKUM	IL
—	815-699	3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	WYANET	IL
—	815-700	not yet reported which blocks →				IL
—	815-702	0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 6 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	SAUNEMIN	IL
—	815-711	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	IL
—	815-714	0–9 XXXall 10 · 7 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IL	984E	JOLIET	IL
—	815-717	0XXX1XXX3XXX4XXX6XXX8XXX · 5 holders which blocks →	FIRST COMMUNICATIONS, LLC	460K	NEW LENOX	IL
—	815-720	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	ROCKFORD	IL
—	815-721	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - IL	7136	ROCKFORD	IL
—	815-722	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	JOLIET	IL
—	815-723	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	JOLIET	IL
—	815-724	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	JOLIET	IL
—	815-725	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	JOLIET	IL
—	815-726	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	JOLIET	IL
—	815-727	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	JOLIET	IL
—	815-728	3XXX7XXX · 2 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	WONDERLAKE	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.