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
NEW CINGULAR WIRELESS PCS, LLC 74
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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2026-01-15 406-918 1XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LIBBY MT
2025-01-06 406-610 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MISSOULA MT
2024-12-23 406-617 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BILLINGS MT
2024-12-18 406-536 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BOZEMAN MT
2021-03-24 406-609 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KALISPELL MT
2020-05-12 406-990 0XXX8XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LAME DEER MT
2017-07-18 406-940 0XXX1XXX5XXX6XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MOLT MT
2010-10-20 406-305 0XXX1XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 WHSLPHRSPG MT
2010-10-20 406-514 0XXX1XXX2XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CULBERTSON MT
2010-10-20 406-956 0XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BAKER MT
2010-10-14 406-505 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CONRAD MT
2010-10-12 406-269 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ST REGIS MT
2010-10-12 406-515 5XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SUPERIOR MT
2010-07-23 406-927 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BILLINGS MT
2009-11-11 406-879 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 HAVRE MT
2008-05-28 406-417 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 HELENA MT
2006-09-08 406-743 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LAUREL MT
2004-10-21 406-314 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KALISPELL MT
2004-05-10 406-334 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LIBBY MT
2003-03-18 406-242 1XXX2XXX5XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 THOMPSNFLS MT
2003-03-18 406-280 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ST REGIS MT
2003-03-18 406-382 1XXX3XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SUPERIOR MT
2003-03-18 406-499 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEELEYLAKE MT
2003-01-21 406-201 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 FORSYTH MT
2003-01-20 406-229 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CUT BANK MT
2001-07-12 406-231 7XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 GREATFALLS MT
2001-04-18 406-202 7XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 HELENA MT
2001-04-18 406-207 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MISSOULA MT
2001-04-18 406-208 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BILLINGS MT
2001-04-18 406-209 8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BOZEMAN MT
2001-04-18 406-212 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KALISPELL MT
— 406-220 5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LIVINGSTON MT
— 406-239 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MISSOULA MT
— 406-240 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MISSOULA MT
— 406-241 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MISSOULA MT
— 406-253 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KALISPELL MT
— 406-260 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KALISPELL MT
— 406-261 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KALISPELL MT
— 406-289 1XXX3XXX4XXX6XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CONRAD MT
— 406-321 5XXX6XXX7XXX8XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 COLUMBUS MT
— 406-340 0XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LIMA MT
— 406-350 4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LEWISTOWN MT
— 406-369 5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 HAMILTON MT
— 406-391 0XXX1XXX2XXX3XXX4XXX6XXX7XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CUT BANK MT
— 406-439 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 HELENA MT
— 406-460 5XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SHELBY MT
— 406-489 5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SIDNEY MT
— 406-491 8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BUTTE MT
— 406-539 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BOZEMAN MT
— 406-553 1XXX3XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DIVIDE 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.