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 |
|---|---|---|---|---|---|---|
| — | 406-244 | not yet reported which blocks → | BLACKFOOT TEL. COOP., INC. | 2235 | POTOMAC | MT |
| — | 406-246 | not yet reported which blocks → | BLACKFOOT TEL. COOP., INC. | 2235 | DIXON | MT |
| — | 406-288 | not yet reported which blocks → | BLACKFOOT TEL. COOP., INC. | 2235 | DRUMMOND | MT |
| — | 406-332 | 1XXX2XXX · 2 holders which blocks → | BLACKFOOT TEL. COOP., INC. | 2235 | PABLO | MT |
| — | 406-349 | not yet reported which blocks → | BLACKFOOT TEL. COOP., INC. | 2235 | ALTA | MT |
| — | 406-492 | not yet reported which blocks → | BLACKFOOT TEL. COOP., INC. | 2235 | AVON | MT |
| — | 406-644 | 0XXX1XXX4XXX · 2 holders which blocks → | BLACKFOOT TEL. COOP., INC. | 2235 | CHARLO | MT |
| — | 406-649 | 0XXX1XXX which blocks → | BLACKFOOT TEL. COOP., INC. | 2235 | ST REGIS | MT |
| — | 406-677 | 0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | BLACKFOOT TEL. COOP., INC. | 2235 | SEELEYLAKE | MT |
| — | 406-678 | not yet reported which blocks → | BLACKFOOT TEL. COOP., INC. | 2235 | HAUGAN | MT |
| — | 406-722 | 7XXX which blocks → | BLACKFOOT TEL. COOP., INC. | 2235 | ALBERTON | MT |
| — | 406-726 | 0XXX1XXX2XXX · 2 holders which blocks → | BLACKFOOT TEL. COOP., INC. | 2235 | ARLEE | MT |
| — | 406-745 | none assigned yet which blocks → | BLACKFOOT TEL. COOP., INC. | 2235 | STIGNATIUS | MT |
| — | 406-754 | not yet reported which blocks → | BLACKFOOT TEL. COOP., INC. | 2235 | CONDON | MT |
| — | 406-793 | not yet reported which blocks → | BLACKFOOT TEL. COOP., INC. | 2235 | OVANDO | MT |
| — | 406-822 | 8XXX which blocks → | BLACKFOOT TEL. COOP., INC. | 2235 | SUPERIOR | 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 |
| — | 406-847 | not yet reported which blocks → | BLACKFOOT TEL. COOP., INC. | 2235 | NOXON | MT |
| — | 406-859 | not yet reported which blocks → | BLACKFOOT TEL. COOP., INC. | 2235 | PHILIPSBG | MT |
| — | 406-864 | not yet reported which blocks → | BLACKFOOT TEL. COOP., INC. | 2235 | S ALBERTON | 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.