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
— 406-689 not yet reported which blocks → SOUTHERN MONTANA TEL. CO. 2254 WISDOM MT
— 406-690 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
— 406-691 4XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ANACONDA MT
— 406-693 0XXX1XXX3XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 WARM SPG MT
— 406-695 none assigned yet which blocks → NEMONT TEL COOP INC 2247 FRAZER MT
— 406-698 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
— 406-699 1XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 HARDIN MT
— 406-700 not yet reported which blocks → MT
— 406-707 0XXX5XXX6XXX7XXX · 4 holders which blocks → TERRA NOVA TELECOM INC. 145J LEWISTOWN MT
— 406-709 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K LAKESIDE MT
— 406-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MT
— 406-718 1XXX4XXX7XXX8XXX · 3 holders which blocks → TWILIO INTERNATIONAL, INC. 506J DARBY MT
— 406-719 0–9 XXXall 10 · 4 holders which blocks → TWILIO INTERNATIONAL, INC. 506J FROMBERG MT
— 406-720 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 COLSTRIP MT
— 406-721 not yet reported which blocks → QWEST CORPORATION 9636 MISSOULA MT
— 406-722 7XXX which blocks → BLACKFOOT TEL. COOP., INC. 2235 ALBERTON MT
— 406-723 not yet reported which blocks → QWEST CORPORATION 9636 BUTTE MT
— 406-724 none assigned yet which blocks → NEMONT TEL COOP INC 2247 GLENTANA MT
— 406-725 not yet reported which blocks → NEMONT TEL COOP INC 2247 LARSLAN MT
— 406-726 0XXX1XXX2XXX · 2 holders which blocks → BLACKFOOT TEL. COOP., INC. 2235 ARLEE MT
— 406-727 not yet reported which blocks → QWEST CORPORATION 9636 GREATFALLS MT
— 406-728 not yet reported which blocks → QWEST CORPORATION 9636 MISSOULA MT
— 406-730 0–9 XXXall 10 · 3 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K WHITEFISH MT
— 406-731 0XXX8XXX · 2 holders which blocks → WAVENATION, LLC 700J GREATFALLS MT
— 406-732 0XXX1XXX2XXX3XXX6XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9636 ST MARY MT
— 406-733 not yet reported which blocks → 3 RIVERS TEL. COOP., INC. 2255 HIGHWOOD MT
— 406-734 not yet reported which blocks → 3 RIVERS TEL. COOP., INC. 2255 CARTER MT
— 406-735 not yet reported which blocks → 3 RIVERS TEL. COOP., INC. 2255 GEYSER MT
— 406-736 2XXX which blocks → 3 RIVERS TEL. COOP., INC. 2255 STOCKETT MT
— 406-737 not yet reported which blocks → TRIANGLE TEL. COOP. ASSN., INC. 3310 GERALDINE MT
— 406-738 not yet reported which blocks → 3 RIVERS TEL. COOP., INC. 2255 RAYNESFORD MT
— 406-739 not yet reported which blocks → TRIANGLE TEL. COOP. ASSN., INC. 2257 LOMA MT
— 406-740 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 COLSTRIP MT
— 406-741 not yet reported which blocks → HOT SPRINGS TEL. CO. 2241 HOTSPRINGS MT
— 406-742 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → MID-RIVERS TELEPHONE COOPERATIVE, INC. 7830 FAIRVIEW MT
— 406-745 none assigned yet which blocks → BLACKFOOT TEL. COOP., INC. 2235 STIGNATIUS MT
— 406-746 not yet reported which blocks → NEMONT TEL COOP INC 2247 NASHUA MT
— 406-747 0XXX2XXX4XXX6XXX7XXX8XXX which blocks → QWEST CORPORATION 9636 FAIRVIEW MT
— 406-748 0XXX1XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9636 COLSTRIP MT
— 406-749 2XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 COLSTRIP MT
— 406-751 not yet reported which blocks → CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK 2249 KALISPELL MT
— 406-752 not yet reported which blocks → CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK 2249 KALISPELL MT
— 406-753 not yet reported which blocks → 3 RIVERS TEL. COOP., INC. 2255 BRADY MT
— 406-754 not yet reported which blocks → BLACKFOOT TEL. COOP., INC. 2235 CONDON MT
— 406-755 not yet reported which blocks → CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK 2249 KALISPELL MT
— 406-756 not yet reported which blocks → CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK 2249 KALISPELL MT
— 406-757 7XXX which blocks → RANGE TEL COOP INC 2251 DECKER MT
— 406-758 not yet reported which blocks → CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK 2249 KALISPELL MT
— 406-759 2XXX9XXX · 2 holders which blocks → TRIANGLE TEL. COOP. ASSN., INC. 2257 CHESTER MT
— 406-760 0XXX2XXX3XXX4XXX8XXX · 3 holders which blocks → VONAGE AMERICA LLC 197D GREATFALLS 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.