NumberResearch Membership · Data 09/21/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/21/2026

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
QWEST CORPORATION 132
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 119
NEW CINGULAR WIRELESS PCS, LLC 74
ONVOY, LLC - MT 43
TRIANGLE TEL. COOP. ASSN., INC. 39
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
— 406-635 0XXX1XXX2XXX3XXX6XXX7XXX8XXX · 5 holders which blocks → MID-RIVERS TEL. COOP., INC. 2246 TERRY MT
— 406-636 not yet reported which blocks → MID-RIVERS TEL. COOP., INC. 2246 LAVINA MT
— 406-637 3XXX4XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 TERRY MT
— 406-638 0XXX1XXX5XXX6XXX8XXX · 4 holders which blocks → PROJECT TEL. CO., INC. 2250 HARDIN MT
— 406-639 not yet reported which blocks → PROJECT TEL. CO., INC. 2250 LODGEGRASS MT
— 406-640 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 WYELLOWSTN MT
— 406-641 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 WYELLOWSTN MT
— 406-642 0XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9636 VICTOR MT
— 406-644 0XXX1XXX4XXX · 2 holders which blocks → BLACKFOOT TEL. COOP., INC. 2235 CHARLO MT
— 406-645 2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - MT 453F DEER LODGE MT
— 406-646 2XXX3XXX6XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 WYELLOWSTN MT
— 406-648 none assigned yet which blocks → NEMONT TEL COOP INC 2247 NOHINSDALE MT
— 406-649 0XXX1XXX which blocks → BLACKFOOT TEL. COOP., INC. 2235 ST REGIS MT
— 406-650 not yet reported which blocks → SAGEBRUSH CELLULAR, INC. 443B WOLF POINT MT
— 406-651 7XXX which blocks → QWEST CORPORATION 9636 BILLINGS MT
— 406-652 not yet reported which blocks → QWEST CORPORATION 9636 BILLINGS MT
— 406-653 none assigned yet which blocks → NEMONT TEL COOP INC 2247 WOLF POINT MT
— 406-654 9XXX which blocks → TRIANGLE TEL. COOP. ASSN., INC. 3310 MALTA MT
— 406-655 not yet reported which blocks → QWEST CORPORATION 9636 BILLINGS MT
— 406-656 not yet reported which blocks → QWEST CORPORATION 9636 BILLINGS MT
— 406-657 not yet reported which blocks → QWEST CORPORATION 9636 BILLINGS MT
— 406-658 not yet reported which blocks → TRIANGLE TEL. COOP. ASSN., INC. 2257 SOUTHMALTA MT
— 406-659 5XXX6XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9636 NO PARKMAN MT
— 406-660 3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DILLON MT
— 406-661 0XXX4XXX6XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
— 406-662 0XXX1XXX2XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → QWEST CORPORATION 9636 BRIDGER MT
— 406-663 not yet reported which blocks → TRIANGLE TEL. COOP. ASSN., INC. 2257 RAPELJE MT
— 406-664 not yet reported which blocks → PROJECT TEL. CO., INC. 2250 BELFRY MT
— 406-665 0XXX which blocks → QWEST CORPORATION 9636 HARDIN MT
— 406-666 not yet reported which blocks → PROJECT TEL. CO., INC. 2250 FORT SMITH MT
— 406-667 not yet reported which blocks → TRIANGLE TEL. COOP. ASSN., INC. 2257 BROADVIEW MT
— 406-668 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 5 holders which blocks → QWEST CORPORATION 9636 FROMBERG MT
— 406-669 not yet reported which blocks → TRIANGLE TEL. COOP. ASSN., INC. 2257 MOLT MT
— 406-670 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
— 406-671 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
— 406-672 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
— 406-673 none assigned yet which blocks → TRIANGLE TEL. COOP. ASSN., INC. 2257 HAYS MT
— 406-674 none assigned yet which blocks → TRIANGLE TEL. COOP. ASSN., INC. 2257 WHITEWATER MT
— 406-675 not yet reported which blocks → RONAN TEL. CO. 2252 PABLO MT
— 406-676 not yet reported which blocks → RONAN TEL. CO. 2252 RONAN MT
— 406-677 0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → BLACKFOOT TEL. COOP., INC. 2235 SEELEYLAKE MT
— 406-678 not yet reported which blocks → BLACKFOOT TEL. COOP., INC. 2235 HAUGAN MT
— 406-679 4XXX7XXX · 2 holders which blocks → NUSO, LLC 732J HARDIN MT
— 406-681 not yet reported which blocks → SOUTHERN MONTANA TEL. CO. 2254 GRANT MT
— 406-682 0XXX which blocks → 3 RIVERS TEL. COOP., INC. 2255 ENNIS MT
— 406-683 not yet reported which blocks → QWEST CORPORATION 9636 DILLON MT
— 406-684 not yet reported which blocks → 3 RIVERS TEL. COOP., INC. 2255 TWINBRIDGS MT
— 406-685 not yet reported which blocks → 3 RIVERS TEL. COOP., INC. 2255 HARRISON MT
— 406-686 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9636 CLYDE PARK MT
— 406-687 0XXX2XXX4XXX which blocks → MID-RIVERS TEL. COOP., INC. 2246 W GLENDIVE MT

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.