Recent prefix assignments

0 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, all time — NPA 231

ONVOY, LLCV - MI 49

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
2023-07-14	231-428	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLCV - MI	543C	MUSKEGON	MI
2023-07-14	231-430	0XXX1XXX2XXX · 3 holders which blocks →	ONVOY, LLCV - MI	543C	BOYNE CITY	MI
2023-07-14	231-435	2XXX which blocks →	ONVOY, LLCV - MI	543C	EASTPORT	MI
2023-07-14	231-438	2XXX4XXX7XXX · 3 holders which blocks →	ONVOY, LLCV - MI	543C	HARBOR SPG	MI
2023-07-14	231-446	2XXX5XXX · 2 holders which blocks →	ONVOY, LLCV - MI	543C	NORTHPORT	MI
2023-07-14	231-451	2XXX which blocks →	ONVOY, LLCV - MI	543C	WILLIAMSBG	MI
2023-07-11	231-210	0XXX2XXX6XXX · 3 holders which blocks →	ONVOY, LLCV - MI	543C	ST JAMES	MI
2023-07-11	231-418	0XXX2XXX9XXX · 3 holders which blocks →	ONVOY, LLCV - MI	543C	MARION	MI
2023-07-11	231-419	0XXX1XXX2XXX · 2 holders which blocks →	ONVOY, LLCV - MI	543C	BELLAIRE	MI
2023-07-11	231-426	2XXX which blocks →	ONVOY, LLCV - MI	543C	RAVENNA	MI
2022-02-04	231-405	0XXX5XXX which blocks →	ONVOY, LLCV - MI	543C	ALDEN	MI
2022-02-04	231-406	0XXX1XXX5XXX · 2 holders which blocks →	ONVOY, LLCV - MI	543C	FALMOUTH	MI
2022-02-04	231-407	0XXX7XXX which blocks →	ONVOY, LLCV - MI	543C	MECOSTA	MI
2022-01-21	231-402	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLCV - MI	543C	MUSKEGON	MI
2021-10-29	231-396	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLCV - MI	543C	CADILLAC	MI
2021-07-20	231-385	0XXX1XXX2XXX3XXX5XXX6XXX7XXX9XXX · 4 holders which blocks →	ONVOY, LLCV - MI	543C	CORAL	MI
2021-07-02	231-376	0XXX6XXX7XXX · 3 holders which blocks →	ONVOY, LLCV - MI	543C	TWIN LAKE	MI
2021-06-25	231-297	0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	ONVOY, LLCV - MI	543C	KINGSLEY	MI
2021-06-25	231-367	1XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks →	ONVOY, LLCV - MI	543C	WOLVERINE	MI
2021-06-15	231-294	3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks →	ONVOY, LLCV - MI	543C	FIFE LAKE	MI
2021-06-15	231-364	0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	ONVOY, LLCV - MI	543C	NORTHPORT	MI
2021-06-15	231-374	0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	ONVOY, LLCV - MI	543C	SHELBY	MI
2021-05-21	231-270	0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	ONVOY, LLCV - MI	543C	BOYNE CITY	MI
2021-05-19	231-431	0XXX1XXX3XXX4XXX5XXX7XXX · 3 holders which blocks →	ONVOY, LLCV - MI	543C	CLAM RIVER	MI
2021-01-08	231-443	3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	ONVOY, LLCV - MI	543C	HONOR	MI
2021-01-08	231-455	0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 2 holders which blocks →	ONVOY, LLCV - MI	543C	PENTWATER	MI
2020-11-09	231-283	0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks →	ONVOY, LLCV - MI	543C	MUSKEGON	MI
2020-10-26	231-273	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLCV - MI	543C	EASTPORT	MI
2020-10-26	231-304	0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks →	ONVOY, LLCV - MI	543C	BRUTUS	MI
2019-10-10	231-400	0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks →	ONVOY, LLCV - MI	543C	ALANSON	MI
2019-10-10	231-500	0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	ONVOY, LLCV - MI	543C	WHITEHALL	MI
2019-08-08	231-272	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLCV - MI	543C	KINGSLEY	MI
2018-09-25	231-310	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLCV - MI	543C	FALMOUTH	MI
2017-10-09	231-666	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLCV - MI	543C	MUSKEGON	MI
2017-10-02	231-800	0XXX2XXX5XXX7XXX8XXX · 4 holders which blocks →	ONVOY, LLCV - MI	543C	LUTHER	MI
2017-09-07	231-300	0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks →	ONVOY, LLCV - MI	543C	ALDEN	MI
2016-03-22	231-277	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLCV - MI	543C	FOUNTAIN	MI
2016-03-22	231-771	0XXX1XXX2XXX3XXX4XXX5XXX · 3 holders which blocks →	ONVOY, LLCV - MI	543C	ELK RAPIDS	MI
2016-02-29	231-280	0XXX1XXX2XXX3XXX5XXX7XXX9XXX · 6 holders which blocks →	ONVOY, LLCV - MI	543C	MANCELONA	MI
2016-02-25	231-707	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	ONVOY, LLCV - MI	543C	NEWAYGO	MI
2015-12-02	231-447	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks →	ONVOY, LLCV - MI	543C	HOLTON	MI
2015-08-24	231-444	0–9 XXXall 10 · 7 holders which blocks →	ONVOY, LLCV - MI	543C	CADILLAC	MI
2015-08-24	231-999	1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks →	ONVOY, LLCV - MI	543C	CENTRAL LK	MI
2015-06-16	231-888	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks →	ONVOY, LLCV - MI	543C	TWIN LAKE	MI
2014-11-07	231-787	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLCV - MI	543C	WHITECLOUD	MI
2014-10-06	231-751	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLCV - MI	543C	WALLOON LK	MI
2014-10-06	231-819	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLCV - MI	543C	TUSTIN	MI
—	231-460	2XXX3XXX6XXX9XXX · 2 holders which blocks →	ONVOY, LLCV - MI	543C	BIG RAPIDS	MI
—	231-831	0XXX1XXX2XXX6XXX8XXX9XXX · 4 holders which blocks →	ONVOY, LLCV - MI	543C	EASTJORDAN	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.