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 |
|---|---|---|---|---|---|---|
| — | 406-791 | not yet reported which blocks → | QWEST CORPORATION | 9636 | GREATFALLS | MT |
| — | 406-792 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | ONVOY, LLC - MT | 453F | BUTTE | MT |
| — | 406-793 | not yet reported which blocks → | BLACKFOOT TEL. COOP., INC. | 2235 | OVANDO | MT |
| — | 406-795 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | QWEST CORPORATION | 9636 | WIBAUX | MT |
| — | 406-796 | 0XXX1XXX3XXX4XXX5XXX7XXX · 3 holders which blocks → | MID-RIVERS TELEPHONE COOPERATIVE, INC. | 7830 | WIBAUX | MT |
| — | 406-797 | 0XXX1XXX2XXX4XXX5XXX6XXX7XXX9XXX which blocks → | QWEST CORPORATION | 9636 | ANACONDA | MT |
| — | 406-798 | not yet reported which blocks → | MID-RIVERS TEL. COOP., INC. | 2246 | WESTSIDNEY | MT |
| — | 406-799 | none assigned yet which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | GREATFALLS | MT |
| — | 406-802 | 0–9 XXXall 10 · 6 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | HAMILTON | MT |
| — | 406-808 | 0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | CENTURYLINK COMMUNICATIONS, LLC | 508J | HAVRE | MT |
| — | 406-811 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | MT |
| — | 406-815 | 0–9 XXXall 10 · 5 holders which blocks → | AT&T - LOCAL | 7421 | RED LODGE | MT |
| — | 406-818 | 0XXX1XXX4XXX5XXX · 3 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | RED LODGE | MT |
| — | 406-821 | 5XXX6XXX7XXX8XXX · 3 holders which blocks → | QWEST CORPORATION | 9636 | DARBY | MT |
| — | 406-822 | 8XXX which blocks → | BLACKFOOT TEL. COOP., INC. | 2235 | SUPERIOR | MT |
| — | 406-823 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → | QWEST CORPORATION | 9636 | LIVINGSTON | MT |
| — | 406-824 | none assigned yet which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | STIGNATIUS | MT |
| — | 406-825 | 4XXX which blocks → | BLACKFOOT TEL. COOP., INC. | 2235 | CLINTON | MT |
| — | 406-826 | 1XXX7XXX8XXX · 3 holders which blocks → | BLACKFOOT TEL. COOP., INC. | 2235 | PLAINS | MT |
| — | 406-827 | none assigned yet which blocks → | BLACKFOOT TEL. COOP., INC. | 2235 | THOMPSNFLS | MT |
| — | 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 |
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.