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 |
|---|---|---|---|---|---|---|
| — | 406-246 | not yet reported which blocks → | BLACKFOOT TEL. COOP., INC. | 2235 | DIXON | MT |
| — | 406-247 | 0XXX9XXX · 2 holders which blocks → | QWEST CORPORATION | 9636 | BILLINGS | MT |
| — | 406-248 | 0XXX which blocks → | QWEST CORPORATION | 9636 | BILLINGS | MT |
| — | 406-249 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | KALISPELL | MT |
| — | 406-250 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | KALISPELL | MT |
| — | 406-251 | not yet reported which blocks → | QWEST CORPORATION | 9636 | MISSOULA | MT |
| — | 406-252 | not yet reported which blocks → | QWEST CORPORATION | 9636 | BILLINGS | MT |
| — | 406-253 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | KALISPELL | MT |
| — | 406-254 | not yet reported which blocks → | QWEST CORPORATION | 9636 | BILLINGS | MT |
| — | 406-255 | not yet reported which blocks → | QWEST CORPORATION | 9636 | BILLINGS | MT |
| — | 406-256 | not yet reported which blocks → | QWEST CORPORATION | 9636 | BILLINGS | MT |
| — | 406-257 | not yet reported which blocks → | CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK | 2249 | KALISPELL | MT |
| — | 406-258 | 0XXX1XXX7XXX8XXX · 3 holders which blocks → | QWEST CORPORATION | 9636 | MISSOULA | MT |
| — | 406-259 | not yet reported which blocks → | QWEST CORPORATION | 9636 | BILLINGS | MT |
| — | 406-260 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | KALISPELL | MT |
| — | 406-261 | none assigned yet which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | KALISPELL | MT |
| — | 406-262 | 0XXX6XXX7XXX8XXX · 4 holders which blocks → | QWEST CORPORATION | 9636 | HAVRE | MT |
| — | 406-263 | not yet reported which blocks → | SAGEBRUSH CELLULAR, INC. | 443B | GLASGOW | MT |
| — | 406-264 | not yet reported which blocks → | 3 RIVERS TEL. COOP., INC. | 2255 | FORT SHAW | MT |
| — | 406-265 | not yet reported which blocks → | QWEST CORPORATION | 9636 | HAVRE | MT |
| — | 406-266 | 0XXX1XXX6XXX7XXX · 3 holders which blocks → | QWEST CORPORATION | 9636 | TOWNSEND | MT |
| — | 406-267 | not yet reported which blocks → | SOUTHERN MONTANA TEL. CO. | 2254 | DIVIDE | MT |
| — | 406-268 | 4XXX5XXX · 2 holders which blocks → | QWEST CORPORATION | 9636 | GREATFALLS | MT |
| — | 406-270 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | KALISPELL | MT |
| — | 406-271 | 6XXX which blocks → | 3 RIVERS TELEPHONE COOPERATIVE, INC. - MT | 3924 | CONRAD | MT |
| — | 406-272 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | ONVOY, LLC - MT | 453F | BILLINGS | MT |
| — | 406-273 | 1XXX8XXX which blocks → | QWEST CORPORATION | 9636 | MISSOULA | MT |
| — | 406-274 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → | TELEPORT COMMUNICATIONS AMERICA MT - LLC | 771G | MISSOULA | MT |
| — | 406-275 | not yet reported which blocks → | RONAN TEL. CO. | 2252 | PABLO | MT |
| — | 406-276 | none assigned yet which blocks → | 3 RIVERS TEL. COOP., INC. | 2255 | LIMA | MT |
| — | 406-277 | not yet reported which blocks → | 3 RIVERS TEL. COOP., INC. | 2255 | BELT | MT |
| — | 406-278 | 1XXX2XXX6XXX8XXX · 3 holders which blocks → | QWEST CORPORATION | 9636 | CONRAD | MT |
| — | 406-279 | not yet reported which blocks → | 3 RIVERS TEL. COOP., INC. | 2255 | VALIER | MT |
| — | 406-281 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA MT - LLC | 771G | BILLINGS | MT |
| — | 406-282 | 0XXX1XXX2XXX3XXX4XXX5XXX8XXX · 4 holders which blocks → | QWEST CORPORATION | 9636 | MANHATTAN | MT |
| — | 406-283 | 0XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → | ZIPLY FIBER MONTANA, LLC DBA ZIPLY FIBER | 4322 | LIBBY | MT |
| — | 406-284 | 0XXX1XXX2XXX5XXX7XXX8XXX · 3 holders which blocks → | QWEST CORPORATION | 9636 | MANHATTAN | MT |
| — | 406-285 | 1XXX2XXX7XXX8XXX · 3 holders which blocks → | QWEST CORPORATION | 9636 | THREEFORKS | MT |
| — | 406-286 | none assigned yet which blocks → | NEMONT TEL COOP INC | 2247 | RESERVE | MT |
| — | 406-287 | 0XXX1XXX4XXX6XXX8XXX · 3 holders which blocks → | QWEST CORPORATION | 9636 | WHITEHALL | MT |
| — | 406-288 | not yet reported which blocks → | BLACKFOOT TEL. COOP., INC. | 2235 | DRUMMOND | MT |
| — | 406-289 | 1XXX3XXX4XXX6XXX8XXX9XXX · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CONRAD | MT |
| — | 406-291 | 8XXX which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | LIBBY | MT |
| — | 406-292 | 2XXX which blocks → | TRIANGLE TEL. COOP. ASSN., INC. | 2257 | JOPLIN | MT |
| — | 406-293 | none assigned yet which blocks → | ZIPLY FIBER MONTANA, LLC DBA ZIPLY FIBER | 4322 | LIBBY | MT |
| — | 406-294 | not yet reported which blocks → | ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM | 4222 | BILLINGS | MT |
| — | 406-295 | 0XXX1XXX2XXX3XXX6XXX8XXX · 2 holders which blocks → | ZIPLY FIBER MONTANA, LLC DBA ZIPLY FIBER | 4322 | TROY | MT |
| — | 406-296 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → | ZIPLY FIBER MONTANA, LLC DBA ZIPLY FIBER | 4322 | EUREKA | MT |
| — | 406-297 | not yet reported which blocks → | INTERBEL TELEPHONE COOPERATIVE, INC. - MT | 3959 | EUREKARURL | MT |
| — | 406-298 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | COLUMBUS | 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.