NumberResearch Membership · Data 09/20/2026

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 406
ONVOY, LLC - MT 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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2022-09-08 406-405 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MT 453F LIBBY MT
2021-04-22 406-807 0XXX1XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLC - MT 453F EGLACIERPK MT
2020-10-13 406-614 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MT 453F BIGFORK MT
2020-07-06 406-341 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - MT 453F MANHATTAN MT
2020-06-17 406-416 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MT 453F FORSYTH MT
2019-08-20 406-418 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MT 453F COOKE CITY MT
2019-08-20 406-501 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MT 453F WHITEHALL MT
2019-08-20 406-804 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MT 453F GARDINER MT
2019-07-12 406-316 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → ONVOY, LLC - MT 453F BOULDER MT
2019-07-12 406-419 0XXX1XXX2XXX4XXX5XXX6XXX · 3 holders which blocks → ONVOY, LLC - MT 453F VICTOR MT
2017-10-20 406-306 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MT 453F MANHATTAN MT
2017-05-22 406-412 0–9 XXXwhole prefix which blocks → ONVOY, LLC - MT 453F BILLINGS MT
2017-03-22 406-510 0–9 XXXwhole prefix which blocks → ONVOY, LLC - MT 453F MISSOULA MT
2013-12-11 406-800 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - MT 453F BRIDGER MT
2012-11-16 406-313 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MT 453F BOULDER MT
2011-10-03 406-302 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MT 453F WOLF CREEK MT
2011-10-03 406-812 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - MT 453F LAUREL MT
2011-10-03 406-905 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MT 453F JOLIET MT
2011-09-27 406-518 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MT 453F GALATNGTWY MT
2011-07-01 406-616 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MT 453F THREEFORKS MT
2011-02-17 406-318 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MT 453F BILLINGS MT
2008-08-26 406-992 0XXX which blocks → ONVOY, LLC - MT 453F HELENA MT
2007-10-11 406-612 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - MT 453F SWAN LAKE MT
2007-10-11 406-692 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MT 453F YELLOW BAY MT
2007-10-11 406-820 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MT 453F OLNEY MT
2007-10-11 406-991 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - MT 453F MARION MT
2007-07-26 406-631 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MT 453F ELMO MT
2007-07-26 406-929 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MT 453F HUNGRYHORS MT
2007-05-24 406-643 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MT 453F NO PARKMAN MT
2007-05-23 406-840 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLC - MT 453F SILVERTIP MT
2007-03-14 406-290 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - MT 453F COLUMBUS MT
2006-03-15 406-794 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MT 453F BILLINGS MT
2006-03-08 406-403 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - MT 453F GREATFALLS MT
2003-02-13 406-221 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - MT 453F BUTTE MT
— 406-272 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - MT 453F BILLINGS MT
— 406-430 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → ONVOY, LLC - MT 453F HELENA MT
— 406-540 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - MT 453F MISSOULA MT
— 406-577 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC - MT 453F BOZEMAN MT
— 406-629 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → ONVOY, LLC - MT 453F HARDIN MT
— 406-634 3XXX4XXX5XXX · 2 holders which blocks → ONVOY, LLC - MT 453F HELENA MT
— 406-645 2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - MT 453F DEER LODGE MT
— 406-792 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - MT 453F BUTTE MT
— 406-836 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - MT 453F GREATFALLS MT

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.