NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026
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 |
|---|---|---|---|---|---|---|
| 2023-01-11 | 618-909 | 1XXX7XXX8XXX9XXX · 4 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | BREESE | IL |
| 2022-12-08 | 618-903 | 0XXX9XXX · 2 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | DORCHESTER | IL |
| 2022-12-08 | 618-904 | 9XXX which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | BALDWIN | IL |
| 2022-10-10 | 618-890 | 1XXX9XXX · 2 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | FREEBURG | IL |
| 2022-10-10 | 618-894 | 9XXX which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | GRAFTON | IL |
| 2022-09-09 | 618-865 | 9XXX which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | LIVINGSTON | IL |
| 2022-09-09 | 618-868 | 8XXX9XXX · 2 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | PRAIRIETN | IL |
| 2022-09-09 | 618-870 | 0XXX1XXX7XXX8XXX9XXX · 5 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | BETHALTO | IL |
| 2022-08-09 | 618-858 | 0XXX1XXX7XXX · 3 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | AVISTON | IL |
| 2022-08-09 | 618-860 | 0XXX1XXX6XXX8XXX · 3 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | GERMANTOWN | IL |
| 2022-08-09 | 618-862 | 0XXX which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | ST LIBORY | IL |
| 2021-12-30 | 618-815 | 0XXX2XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | E ST LOUIS | IL |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.