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
— 406-828 8XXX which blocks → RANGE TEL COOP INC 2251 ALZADA MT
— 406-829 not yet reported which blocks → QWEST CORPORATION 9636 MISSOULA MT
— 406-832 not yet reported which blocks → SOUTHERN MONTANA TEL. CO. 2254 WISE RIVER MT
— 406-833 0XXX1XXX2XXX3XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 RONAN MT
— 406-834 not yet reported which blocks → SOUTHERN MONTANA TEL. CO. 2254 JACKSON MT
— 406-835 not yet reported which blocks → 3 RIVERS TEL. COOP., INC. 2255 MELROSE MT
— 406-836 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - MT 453F GREATFALLS MT
— 406-837 8XXX9XXX · 2 holders which blocks → CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK 2249 BIGFORK MT
— 406-838 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9636 COOKE CITY MT
— 406-841 none assigned yet which blocks → QWEST CORPORATION 9636 HELENA MT
— 406-842 none assigned yet which blocks → 3 RIVERS TEL. COOP., INC. 2255 SHERIDAN MT
— 406-843 not yet reported which blocks → 3 RIVERS TEL. COOP., INC. 2255 VIRGINIACY MT
— 406-844 1XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK 2249 LAKESIDE MT
— 406-846 0XXX4XXX5XXX6XXX · 3 holders which blocks → QWEST CORPORATION 9636 DEER LODGE MT
— 406-847 not yet reported which blocks → BLACKFOOT TEL. COOP., INC. 2235 NOXON MT
— 406-848 0XXX1XXX3XXX4XXX5XXX6XXX8XXX · 5 holders which blocks → QWEST CORPORATION 9636 GARDINER MT
— 406-849 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK 2249 ELMO MT
— 406-850 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BILLINGS MT
— 406-851 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MILES CITY MT
— 406-852 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MILES CITY MT
— 406-853 7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MILES CITY MT
— 406-854 0XXX1XXX3XXX5XXX6XXX9XXX · 5 holders which blocks → CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK 2249 MARION MT
— 406-855 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BILLINGS MT
— 406-856 not yet reported which blocks → MID-RIVERS TEL. COOP., INC. 2246 CUSTER MT
— 406-857 0XXX1XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK 2249 SOMERS MT
— 406-858 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J KALISPELL MT
— 406-859 not yet reported which blocks → BLACKFOOT TEL. COOP., INC. 2235 PHILIPSBG MT
— 406-860 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BILLINGS MT
— 406-861 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BILLINGS MT
— 406-862 not yet reported which blocks → CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK 2249 WHITEFISH MT
— 406-863 5XXX6XXX7XXX8XXX · 4 holders which blocks → CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK 2249 WHITEFISH MT
— 406-864 not yet reported which blocks → BLACKFOOT TEL. COOP., INC. 2235 S ALBERTON MT
— 406-865 1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 DILLON MT
— 406-866 0XXX1XXX6XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9636 GREATFALLS MT
— 406-867 0XXX3XXX5XXX7XXX9XXX · 2 holders which blocks → WAVENATION, LLC 700J BILLINGS MT
— 406-868 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 GREATFALLS MT
— 406-869 not yet reported which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 4222 BILLINGS MT
— 406-870 2XXX which blocks → BANDWIDTH.COM CLEC, LLC - MT 994E GREATFALLS MT
— 406-873 0XXX1XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 CUT BANK MT
— 406-874 none assigned yet which blocks → MID-RIVERS TELEPHONE COOPERATIVE, INC. 7830 MILES CITY MT
— 406-875 not yet reported which blocks → PROJECT TEL. CO., INC. 2250 POMPESPLLR MT
— 406-876 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
— 406-877 not yet reported which blocks → RESERVATION TEL. COOP. 1632 WEST BEACH MT
— 406-880 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
— 406-881 0XXX1XXX3XXX · 3 holders which blocks → CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK 2249 OLNEY MT
— 406-882 not yet reported which blocks → INTERBEL TEL. COOP., INC. 2242 EUREKARURL MT
— 406-883 not yet reported which blocks → CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK 2249 POLSON MT
— 406-884 1XXX2XXX4XXX7XXX8XXX · 5 holders which blocks → CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK 2249 POLSON MT
— 406-885 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 KALISPELL MT
— 406-886 0XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK 2249 SWAN LAKE 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.