Recent prefix assignments

1 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 517

CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 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
2026-08-28	517-396	0XXX1XXX2XXX which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI	6003	JACKSON	MI
2026-07-24	517-471	0XXX which blocks →	VOIP INNOVATIONS, LLC	597F	ONONDAGA	MI
2026-06-24	517-389	9XXX which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	ADRIAN	MI
2026-06-02	517-587	0–9 XXXall 10 · 3 holders which blocks →	AHOI LLC	883K	LANSING	MI
2026-04-27	517-387	7XXX9XXX · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	HILLSDALE	MI
2026-01-29	517-385	0XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	WAVENATION, LLC	700J	LANSING	MI
2025-11-20	517-361	0XXX7XXX · 2 holders which blocks →	BANDWIDTH.COM CLEC, LLC - MI	991E	NASHVILLE	MI
2025-10-06	517-307	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	JACKSON	MI
2025-02-25	517-259	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI	6003	JACKSON	MI
2024-10-23	517-384	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	CHARLOTTE	MI
2024-09-16	517-382	2XXX7XXX · 2 holders which blocks →	COMCAST IP PHONE, LLC	318J	LESLIE	MI
2024-08-20	517-379	0XXX which blocks →	BANDWIDTH.COM CLEC, LLC - MI	991E	BUNDY HILL	MI
2024-02-21	517-362	0XXX1XXX7XXX8XXX9XXX · 3 holders which blocks →	OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC	2964	MASON	MI
2024-01-17	517-380	0XXX1XXX9XXX · 2 holders which blocks →	OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC	2964	HOWELL	MI
2023-11-16	517-218	1XXX7XXX9XXX · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	PORTLAND	MI
2023-08-29	517-310	7XXX which blocks →	AT&T ENTERPRISES, LLC	516C	MULLIKEN	MI
2023-07-05	517-352	0XXX2XXX · 2 holders which blocks →	ONVOY, LLCV - MI	543C	BATH	MI
2023-07-05	517-354	2XXX which blocks →	ONVOY, LLCV - MI	543C	LAINGSBURG	MI
2023-07-05	517-359	0XXX2XXX · 2 holders which blocks →	ONVOY, LLCV - MI	543C	STOCKBDG	MI
2023-07-05	517-365	0XXX1XXX2XXX · 3 holders which blocks →	ONVOY, LLCV - MI	543C	WEBBERVL	MI
2023-07-05	517-370	0XXX1XXX2XXX · 3 holders which blocks →	ONVOY, LLCV - MI	543C	MONTGOMERY	MI
2023-06-29	517-892	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - MI	770E	LANSING	MI
2023-03-16	517-551	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks →	METROPCS, INC.	5562	FOWLERVL	MI
2023-03-10	517-350	0XXX1XXX8XXX9XXX · 2 holders which blocks →	HD CARRIER LLC	321J	LANSING	MI
2023-03-03	517-314	0–9 XXXall 10 · 5 holders which blocks →	NUSO, LLC	732J	JACKSON	MI
2023-01-25	517-299	0–9 XXXall 10 · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - MI	991E	LANSING	MI
2022-02-28	517-746	0XXX1XXX3XXX8XXX9XXX · 4 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	COLDWATER	MI
2022-02-24	517-427	3XXX which blocks →	TON80 COMMUNICATIONS, LLC	516J	RIVES JCT	MI
2022-02-22	517-399	0XXX2XXX3XXX5XXX7XXX8XXX9XXX · 5 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	EATON RPD	MI
2022-02-22	517-426	2XXX4XXX · 2 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	MUNITH	MI
2022-02-22	517-733	0XXX3XXX7XXX · 3 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	ADDISON	MI
2022-01-11	517-837	2XXX4XXX7XXX8XXX9XXX · 4 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	TECUMSEH	MI
2022-01-07	517-893	0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	TWILIO INTERNATIONAL, INC.	506J	LANSING	MI
2021-12-21	517-344	0–9 XXXall 10 · 6 holders which blocks →	NUSO, LLC	478J	JACKSON	MI
2021-12-14	517-326	0XXX1XXX2XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	BOOST SUBSCRIBERCO L.L.C.	490J	LANSING	MI
2021-12-02	517-440	0XXX1XXX2XXX8XXX9XXX · 3 holders which blocks →	NUSO, LLC	478J	LANSING	MI
2021-10-15	517-302	0–9 XXXall 10 · 3 holders which blocks →	OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC	2964	FOWLERVL	MI
2021-10-04	517-378	0–9 XXXall 10 · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	POTTERVL	MI
2021-09-29	517-553	0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	METROPCS, INC.	5562	HOWELL	MI
2021-09-17	517-744	0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	SKYE TELECOM LLC DBA SKYETEL	622J	LANSING	MI
2021-09-03	517-297	0–9 XXXall 10 · 6 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	HILLSDALE	MI
2021-09-03	517-633	0–9 XXXall 10 · 5 holders which blocks →	SKYE TELECOM LLC DBA SKYETEL	622J	ADRIAN	MI
2021-07-29	517-293	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLCV - MI	543C	LESLIE	MI
2021-06-25	517-274	2XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks →	ONVOY, LLCV - MI	543C	SHAFTSBURG	MI
2021-06-25	517-276	0XXX1XXX2XXX6XXX7XXX · 4 holders which blocks →	ONVOY, LLCV - MI	543C	HUDSON	MI
2021-06-23	517-514	0XXX1XXX2XXX4XXX5XXX8XXX9XXX · 4 holders which blocks →	METROPCS, INC.	5562	CLINTON	MI
2021-05-19	517-510	0XXX2XXX8XXX9XXX · 4 holders which blocks →	ONVOY, LLCV - MI	543C	CLAYTON	MI
2021-05-19	517-516	5XXX6XXX7XXX9XXX · 2 holders which blocks →	ONVOY SPECTRUM, LLC	624H	ONSTED	MI
2021-05-19	517-537	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLCV - MI	543C	HOWELL	MI
2021-05-19	517-557	5XXX7XXX9XXX · 3 holders which blocks →	ONVOY SPECTRUM, LLC	624H	BRITTON	MI

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.