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
—	815-351	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	KANKAKEE	IL
—	815-352	7XXX which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IL	6115	KANKAKEE	IL
—	815-353	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	WOODSTOCK	IL
—	815-354	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	WOODSTOCK	IL
—	815-355	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	WOODSTOCK	IL
—	815-356	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	CRYSTAL LK	IL
—	815-357	0XXX2XXX4XXX7XXX · 4 holders which blocks →	ILLINOIS BELL TEL CO	9329	SENECA	IL
—	815-358	not yet reported which blocks →	C-R TELEPHONE CO.	1009	CORNELL	IL
—	815-359	1XXX which blocks →	BRIGHTSPEED OF ILLINOIS, LLC	1057	HARMON	IL
—	815-360	not yet reported which blocks →	AERO NORTH COMMUNICATIONS, INC. - IL	443F	SUBLETTE	IL
—	815-361	none assigned yet which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IL	6115	MANHATTAN	IL
—	815-362	0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks →	FRONTIER NORTH, INC. - IL	1036	GERMAN VLY	IL
—	815-363	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	MCHENRY	IL
—	815-364	7XXX8XXX9XXX which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IL	6115	MORRIS	IL
—	815-365	1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	REDDICK	IL
—	815-366	6XXX which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IL	6115	OTTAWA	IL
—	815-367	1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks →	FRONTIER NORTH, INC. - IL	1036	WINSLOW	IL
—	815-368	2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	LOSTANT	IL
—	815-369	0XXX1XXX6XXX7XXX8XXX · 4 holders which blocks →	FRONTIER NORTH, INC. - IL	1036	LENA	IL
—	815-370	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	KANKAKEE	IL
—	815-371	8XXX which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IL	6115	UTICA	IL
—	815-372	5XXX6XXX7XXX8XXX · 2 holders which blocks →	ILLINOIS BELL TEL CO	9329	LOCKPORT	IL
—	815-375	4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	UNITED STATES CELLULAR - IL	6265	DE KALB	IL
—	815-376	1XXX3XXX6XXX8XXX9XXX · 5 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	OHIO	IL
—	815-377	not yet reported which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IL	6115	CRESCENTCY	IL
—	815-378	none assigned yet which blocks →	T-MOBILE USA, INC.	6529	ROCKFORD	IL
—	815-379	1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks →	FRONTIER NORTH, INC. - IL	1015	WALNUT	IL
—	815-380	0XXX1XXX which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IL	6115	STERLING	IL
—	815-381	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	ROCKFORD	IL
—	815-382	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	WOODSTOCK	IL
—	815-383	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	CRESCENTCY	IL
—	815-384	0XXX1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	FRONTIER NORTH, INC. - IL	1036	CRESTON	IL
—	815-385	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	MCHENRY	IL
—	815-386	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL	6333	KANKAKEE	IL
—	815-387	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	ROCKFORD	IL
—	815-388	0–9 XXXall 10 · 7 holders which blocks →	METROPCS, INC.	5562	MCHENRY	IL
—	815-389	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	SO BELOIT	IL
—	815-391	0XXX1XXX3XXX4XXX which blocks →	ILLINOIS BELL TEL CO	9329	ROCKFORD	IL
—	815-392	not yet reported which blocks →	KINSMAN MUTUAL TEL. CO.	1041	KINSMAN	IL
—	815-393	1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	FRONTIER NORTH, INC. - IL	1036	MONROE CTR	IL
—	815-394	9XXX which blocks →	ILLINOIS BELL TEL CO	9329	ROCKFORD	IL
—	815-395	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	ROCKFORD	IL
—	815-396	1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	FRONTIER NORTH, INC. - IL	1036	STEWARD	IL
—	815-397	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	ROCKFORD	IL
—	815-398	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	ROCKFORD	IL
—	815-399	not yet reported which blocks →	ILLINOIS BELL TEL CO	9329	ROCKFORD	IL
—	815-401	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IL	6115	KANKAKEE	IL
—	815-402	1XXX2XXX3XXX4XXX8XXX · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IL	6115	GALENA	IL
—	815-403	0XXX2XXX5XXX7XXX8XXX · 2 holders which blocks →	METROPCS, INC.	5562	MCHENRY	IL
—	815-404	0XXX2XXX4XXX5XXX7XXX8XXX · 3 holders which blocks →	METROPCS, INC.	5562	CRYSTAL LK	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.