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 |
|---|---|---|---|---|---|---|
| 2026-04-02 | 346-924 | 0–9 XXXall 10 · 2 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | HOUSTON | TX |
| 2025-12-04 | 346-906 | 0–9 XXXall 10 · 2 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | HOUSTON | TX |
| 2025-05-12 | 346-870 | 0–9 XXXall 10 · 2 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | LANGHAMCRK | TX |
| 2025-04-22 | 346-869 | 0–9 XXXall 10 · 3 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | HSTNSUBURB | TX |
| 2025-02-18 | 346-860 | 0–9 XXXall 10 · 2 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | HOUSTON | TX |
| 2023-09-07 | 346-693 | 0–9 XXXall 10 · 4 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | HSTNSUBURB | TX |
| 2022-01-06 | 346-538 | 0–9 XXXall 10 · 4 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | RICHMNRNBG | TX |
| 2022-01-06 | 346-539 | 0–9 XXXall 10 · 4 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | CYPRESS | TX |
| 2022-01-06 | 346-540 | 0–9 XXXall 10 · 6 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | SPLENDORA | TX |
| 2021-12-29 | 346-537 | 0–9 XXXall 10 · 4 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | HOUSTON | TX |
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.