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 |
|---|---|---|---|---|---|---|
| 2023-05-22 | 447-255 | 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 2 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | ALEXANDER | IL |
| 2023-02-16 | 447-248 | 9XXX which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | ASHLAND | IL |
| 2023-02-06 | 447-217 | 0–9 XXXall 10 · 2 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | DANVILLE | IL |
| 2023-02-06 | 447-242 | 9XXX which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | ELKHART | IL |
| 2022-11-28 | 447-241 | 9XXX which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | TAYLORVL | IL |
| 2021-12-15 | 447-226 | 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | SPRINGFLD | IL |
| 2021-12-10 | 447-220 | 9XXX which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | CHAMPAURBN | IL |
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.