NumberResearchRecent prefix assignments
334 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/28/2026
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, last 30 days
New assignments by month
Sep 2026
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Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 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 |
| — | 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 |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/28/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.