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 |
|---|---|---|---|---|---|---|
| — | 406-922 | 4XXX7XXX8XXX9XXX · 3 holders which blocks → | ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM | 4222 | BOZEMAN | MT |
| — | 406-923 | 3XXX8XXX9XXX · 2 holders which blocks → | COMMIO, LLC | 939H | GREATFALLS | MT |
| — | 406-925 | 5XXX6XXX7XXX · 3 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | DILLON | MT |
| — | 406-928 | none assigned yet which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | GRASSRANGE | MT |
| — | 406-930 | 3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | BIG TIMBER | MT |
| — | 406-931 | 1XXX9XXX · 2 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | BIG TIMBER | MT |
| — | 406-932 | 7XXX which blocks → | TRIANGLE TEL. COOP. ASSN., INC. | 2257 | BIG TIMBER | MT |
| — | 406-933 | 3XXX4XXX which blocks → | QWEST CORPORATION | 9636 | HELENA | MT |
| — | 406-934 | 1XXX8XXX · 2 holders which blocks → | WIDE VOICE, LLC - MT | 743G | MILES CITY | MT |
| — | 406-935 | 2XXX3XXX5XXX · 2 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | BROADUS | MT |
| — | 406-937 | not yet reported which blocks → | NORTHERN TEL. COOP., INC. | 2248 | SUNBURST | MT |
| — | 406-938 | 3XXX7XXX · 2 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | ALZADA | MT |
| — | 406-939 | 8XXX9XXX · 2 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | W GLENDIVE | MT |
| — | 406-941 | 1XXX2XXX3XXX · 2 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | W GLENDIVE | MT |
| — | 406-945 | 7XXX8XXX9XXX · 3 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | HAVRE | MT |
| — | 406-947 | not yet reported which blocks → | MID-RIVERS TEL. COOP., INC. | 2246 | MUSSELSHLL | MT |
| — | 406-949 | 4XXX9XXX which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TOWNSEND | MT |
| — | 406-950 | not yet reported which blocks → | MT | |||
| — | 406-951 | 7XXX8XXX9XXX · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MILES CITY | MT |
| — | 406-952 | 0–9 XXXall 10 · 3 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | GREATFALLS | MT |
| — | 406-953 | 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | SAGEBRUSH CELLULAR, INC. | 443B | HARDIN | MT |
| — | 406-954 | 2XXX which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | ROY | MT |
| — | 406-957 | 1XXX2XXX3XXX6XXX7XXX · 3 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | TERRY | MT |
| — | 406-958 | not yet reported which blocks → | MT | |||
| — | 406-959 | not yet reported which blocks → | MT | |||
| — | 406-961 | 2XXX6XXX7XXX9XXX · 4 holders which blocks → | QWEST CORPORATION | 9636 | HAMILTON | MT |
| — | 406-962 | 0XXX1XXX2XXX5XXX6XXX7XXX · 4 holders which blocks → | QWEST CORPORATION | 9636 | JOLIET | MT |
| — | 406-963 | none assigned yet which blocks → | NEMONT TEL COOP INC | 2247 | FROIDRURAL | MT |
| — | 406-964 | 2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → | QWEST CORPORATION | 9636 | GREATFALLS | MT |
| — | 406-965 | 1XXX which blocks → | AIRUS, INC. - MT | 588H | GREATFALLS | MT |
| — | 406-967 | 1XXX5XXX · 2 holders which blocks → | PROJECT TEL. CO., INC. | 2250 | WORDEN | MT |
| — | 406-969 | 0–9 XXXall 10 · 4 holders which blocks → | SKYE TELECOM LLC DBA SKYETEL | 622J | BILLINGS | MT |
| — | 406-971 | 5XXX which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | PLEVNA | MT |
| — | 406-972 | not yet reported which blocks → | WEST RIVER COOPERATIVE TELEPHONE COMPANY | 1689 | WCAMPCROOK | MT |
| — | 406-973 | 1XXX8XXX · 2 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | SIDNEY | MT |
| — | 406-974 | 4XXX6XXX7XXX · 2 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | CIRCLE | MT |
| — | 406-975 | 8XXX which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | EKALAKA | MT |
| — | 406-976 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | MT |
| — | 406-977 | 6XXX7XXX which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | JORDAN | MT |
| — | 406-978 | 9XXX which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | BAKER | MT |
| — | 406-979 | none assigned yet which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | RICHEY | MT |
| — | 406-980 | 5XXX6XXX7XXX8XXX · 3 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | TOWNSEND | MT |
| — | 406-981 | 1XXX which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | SOMILES CY | MT |
| — | 406-982 | 0XXX1XXX7XXX8XXX9XXX · 5 holders which blocks → | CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK | 2249 | YELLOW BAY | MT |
| — | 406-983 | 1XXX2XXX · 2 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | ASHLAND | MT |
| — | 406-984 | none assigned yet which blocks → | RANGE TEL COOP INC | 2251 | BIRNEY | MT |
| — | 406-987 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | GLENDIVE | MT |
| — | 406-989 | 2XXX9XXX which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | W GLENDIVE | MT |
| — | 406-993 | 0XXX8XXX · 2 holders which blocks → | 3 RIVERS TEL. COOP., INC. | 2255 | BIG SKY | MT |
| — | 406-994 | not yet reported which blocks → | QWEST CORPORATION | 9636 | 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.