NumberResearchRecent prefix assignments
347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026
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
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Oct 2025
Quick find in this area code:
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 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 |
| — | 406-887 | 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK | 2249 | FINLEY PT | MT |
| — | 406-888 | 0XXX1XXX2XXX3XXX4XXX6XXX8XXX · 4 holders which blocks → | QWEST CORPORATION | 9636 | W GLACIER | MT |
| — | 406-889 | not yet reported which blocks → | INTERBEL TEL. COOP., INC. | 2242 | EUREKARURL | MT |
| — | 406-890 | 0–9 XXXall 10 · 3 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | KALISPELL | MT |
| — | 406-891 | 2XXX4XXX · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BAKER | MT |
| — | 406-892 | not yet reported which blocks → | CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK | 2249 | COLUMBIFLS | MT |
| — | 406-893 | none assigned yet which blocks → | NEMONT TEL COOP INC | 2247 | PEERLESS | MT |
| — | 406-894 | 0–9 XXXall 10 · 6 holders which blocks → | COMMIO, LLC | 939H | BILLINGS | MT |
| — | 406-895 | none assigned yet which blocks → | NEMONT TEL COOP INC | 2247 | OUTLOOK | MT |
| — | 406-896 | not yet reported which blocks → | QWEST CORPORATION | 9636 | BILLINGS | MT |
| — | 406-897 | 0–9 XXXall 10 · 5 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | COLUMBIFLS | MT |
| — | 406-899 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | GREATFALLS | MT |
| — | 406-911 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | MT |
| — | 406-913 | 1XXX which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | ROUNDUP | MT |
| — | 406-914 | 3XXX which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | LAMBERT | MT |
| — | 406-915 | none assigned yet which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | SO WOLF PT | MT |
| — | 406-920 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | BOZEMAN | MT |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/29/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.