NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026
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.
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 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 |
| — | 406-995 | 0XXX which blocks → | 3 RIVERS TEL. COOP., INC. | 2255 | BIG SKY | MT |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.