Recent prefix assignments

0 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, all time — NPA 815

ILLINOIS BELL TEL CO 157

FRONTIER NORTH, INC. - IL 133

LEVEL 3 COMMUNICATIONS, LLC - IL 76

CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 50

AERO NORTH COMMUNICATIONS, INC. - IL 43

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
—	815-849	0XXX1XXX2XXX3XXX4XXX6XXX8XXX · 5 holders which blocks →	FRONTIER NORTH, INC. - IL	1036	SUBLETTE	IL
—	815-850	not yet reported which blocks →	AERO NORTH COMMUNICATIONS, INC. - IL	443F	SEWARD	IL
—	815-851	not yet reported which blocks →	SPOK, INC.	6630	KANKAKEE	IL
—	815-852	not yet reported which blocks →	AERO NORTH COMMUNICATIONS, INC. - IL	443F	SCALESMOND	IL
—	815-853	1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	WENONA	IL
—	815-854	1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	LONG POINT	IL
—	815-856	not yet reported which blocks →	LEONORE MUTUAL TEL. CO.	1046	LEONORE	IL
—	815-857	1XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	FRONTIER NORTH, INC. - IL	1036	AMBOY	IL
—	815-858	0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	FRONTIER NORTH, INC. - IL	1036	ELIZABETH	IL
—	815-861	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	WOODSTOCK	IL
—	815-863	0XXX2XXX4XXX6XXX8XXX9XXX · 4 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	RUTLAND	IL
—	815-864	0XXX6XXX8XXX · 3 holders which blocks →	CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL	1183	SHANNON	IL
—	815-865	0XXX1XXX2XXX3XXX6XXX7XXX8XXX · 6 holders which blocks →	FRONTIER NORTH, INC. - IL	1036	DAVIS	IL
—	815-866	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	PRINCETON	IL
—	815-868	0XXX1XXX4XXX6XXX8XXX · 4 holders which blocks →	FRONTIER NORTH, INC. - IL	1036	MCCONNELL	IL
—	815-869	2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	MAGNOLIA	IL
—	815-870	not yet reported which blocks →	SPOK, INC.	6630	ROCKFORD	IL
—	815-871	none assigned yet which blocks →	UNITED STATES CELLULAR - IL	6265	ROCKFORD	IL
—	815-872	not yet reported which blocks →	FRONTIER NORTH, INC. - IL	1015	PRINCETON	IL
—	815-873	2XXX6XXX7XXX · 3 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	NEWMILFORD	IL
—	815-874	not yet reported which blocks →	FRONTIER NORTH, INC. - IL	1015	NEWMILFORD	IL
—	815-875	7XXX which blocks →	FRONTIER NORTH, INC. - IL	1015	PRINCETON	IL
—	815-876	0XXX4XXX6XXX7XXX9XXX · 3 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	PRINCETON	IL
—	815-877	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	ROCKFORD	IL
—	815-878	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	PRINCETON	IL
—	815-879	6XXX which blocks →	FRONTIER NORTH, INC. - IL	1015	PRINCETON	IL
—	815-881	1XXX2XXX4XXX5XXX6XXX8XXX · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IL	6115	OREGON	IL
—	815-882	not yet reported which blocks →	MCNABB TEL. CO.	1048	MCNABB	IL
—	815-883	0XXX1XXX2XXX4XXX6XXX · 3 holders which blocks →	ILLINOIS BELL TEL CO	9329	OGLESBY	IL
—	815-885	0XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	ROCK CUT	IL
—	815-886	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	LOCKPORT	IL
—	815-889	0XXX1XXX2XXX3XXX7XXX8XXX · 5 holders which blocks →	FRONTIER COMMUNICATIONS OF THE CAROLINAS, INC - IL	1000	MILFORD	IL
—	815-894	0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	LADD	IL
—	815-895	not yet reported which blocks →	FRONTIER NORTH, INC. - IL	1036	SYCAMORE	IL
—	815-897	1XXX9XXX · 2 holders which blocks →	MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL	846F	LYNDON	IL
—	815-899	not yet reported which blocks →	FRONTIER NORTH, INC. - IL	1036	SYCAMORE	IL
—	815-908	0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	FREEPORT	IL
—	815-910	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	MENDOTA	IL
—	815-911	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	IL
—	815-913	0–9 XXXall 10 · 8 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	CHADWICK	IL
—	815-914	0XXX2XXX · 2 holders which blocks →	METROPCS, INC.	5562	ROCKFORD	IL
—	815-916	0–9 XXXall 10 · 6 holders which blocks →	ONVOY, LLC	224C	PLATTVILLE	IL
—	815-917	not yet reported which blocks →	AERO NORTH COMMUNICATIONS, INC. - IL	443F	ROCHELLE	IL
—	815-922	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	KANKAKEE	IL
—	815-923	0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	ILLINOIS BELL TEL CO	9329	UNION	IL
—	815-924	not yet reported which blocks →	AERO NORTH COMMUNICATIONS, INC. - IL	443F	PROPHETSTN	IL
—	815-925	1XXX3XXX5XXX6XXX8XXX · 5 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	HENNEPIN	IL
—	815-927	1XXX7XXX9XXX · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IL	6115	JOLIET	IL
—	815-928	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	KANKAKEE	IL
—	815-929	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	KANKAKEE	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.