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
Aug 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 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 |
| — | 406-761 | not yet reported which blocks → | QWEST CORPORATION | 9636 | GREATFALLS | MT |
| — | 406-762 | none assigned yet which blocks → | NEMONT TEL COOP INC | 2247 | OPHEIM | MT |
| — | 406-763 | 0XXX1XXX2XXX3XXX6XXX7XXX8XXX · 4 holders which blocks → | QWEST CORPORATION | 9636 | GALATNGTWY | MT |
| — | 406-764 | none assigned yet which blocks → | TRI-COUNTY TEL. ASSN., INC. | 2296 | NO FRANNIE | MT |
| — | 406-765 | 5XXX6XXX · 2 holders which blocks → | NEMONT TEL COOP INC | 2247 | PLENTYWOOD | MT |
| — | 406-766 | not yet reported which blocks → | NEMONT TEL COOP INC | 2247 | FROID | MT |
| — | 406-767 | not yet reported which blocks → | RT COMMUNICATIONS | 3410 | RIDGE | MT |
| — | 406-768 | none assigned yet which blocks → | NEMONT TEL COOP INC | 2247 | POPLAR | MT |
| — | 406-769 | 3XXX which blocks → | NEMONT TEL COOP INC | 2247 | BAINVILLE | MT |
| — | 406-770 | 0–9 XXXall 10 · 6 holders which blocks → | COMCAST IP PHONE, LLC | 318J | GREATFALLS | MT |
| — | 406-771 | not yet reported which blocks → | QWEST CORPORATION | 9636 | GREATFALLS | MT |
| — | 406-772 | 1XXX2XXX7XXX · 2 holders which blocks → | MID-RIVERS TEL. COOP., INC. | 2246 | PLEVNA | MT |
| — | 406-773 | 3XXX7XXX · 2 holders which blocks → | MID-RIVERS TEL. COOP., INC. | 2246 | RICHEY | MT |
| — | 406-774 | 1XXX4XXX · 2 holders which blocks → | MID-RIVERS TEL. COOP., INC. | 2246 | LAMBERT | MT |
| — | 406-775 | 1XXX4XXX5XXX7XXX · 3 holders which blocks → | MID-RIVERS TEL. COOP., INC. | 2246 | EKALAKA | MT |
| — | 406-776 | not yet reported which blocks → | MID-RIVERS TEL. COOP., INC. | 2246 | SAVAGE | MT |
| — | 406-777 | 6XXX8XXX which blocks → | QWEST CORPORATION | 9636 | STEVENSVL | MT |
| — | 406-778 | 1XXX4XXX · 2 holders which blocks → | MID-RIVERS TEL. COOP., INC. | 2246 | BAKER | MT |
| — | 406-779 | 9XXX which blocks → | NEMONT TEL COOP INC | 2247 | FLAXVLRURL | MT |
| — | 406-780 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | COLUMBUS | MT |
| — | 406-781 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | GREATFALLS | MT |
| — | 406-782 | not yet reported which blocks → | QWEST CORPORATION | 9636 | BUTTE | MT |
| — | 406-783 | none assigned yet which blocks → | NEMONT TEL COOP INC | 2247 | SCOBEYRURL | MT |
| — | 406-784 | none assigned yet which blocks → | RANGE TEL COOP INC | 2251 | ASHLAND | MT |
| — | 406-785 | 4XXX which blocks → | NEMONT TEL COOP INC | 2247 | NO NASHUA | MT |
| — | 406-786 | none assigned yet which blocks → | NEMONT TEL COOP INC | 2247 | BROCKTON | MT |
| — | 406-787 | 8XXX which blocks → | NEMONT TEL COOP INC | 2247 | CULBERTSON | MT |
| — | 406-788 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | GREATFALLS | MT |
| — | 406-789 | none assigned yet which blocks → | NEMONT TEL COOP INC | 2247 | MEDICINELK | MT |
| — | 406-790 | 1XXX4XXX5XXX9XXX · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CULBERTSON | 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.