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 |
|---|---|---|---|---|---|---|
| 2025-03-21 | 620-671 | 9XXX which blocks → | T-MOBILE USA, INC. | 6529 | INMAN | KS |
| 2025-03-21 | 620-681 | 0XXX9XXX · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | LONGTON | KS |
| 2025-03-21 | 620-683 | 9XXX which blocks → | T-MOBILE USA, INC. | 6529 | SOUTHHAVEN | KS |
| 2023-01-11 | 620-606 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | FORT SCOTT | KS |
| 2022-07-22 | 620-454 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | ARKANSASCY | KS |
| 2022-07-22 | 620-602 | 0XXX1XXX9XXX · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | KINGMAN | KS |
| 2022-05-04 | 620-601 | 0XXX1XXX8XXX9XXX · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | PRATT | KS |
| 2022-01-31 | 620-581 | 0XXX7XXX9XXX · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | BAXTER SPG | KS |
| 2021-05-14 | 620-469 | 0–9 XXXall 10 · 5 holders which blocks → | T-MOBILE USA, INC. | 6529 | ARKANSASCY | KS |
| 2021-02-12 | 620-418 | 0–9 XXXall 10 · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | FORT SCOTT | KS |
| 2021-02-12 | 620-419 | 0–9 XXXall 10 · 5 holders which blocks → | T-MOBILE USA, INC. | 6529 | PRATT | KS |
| 2001-06-08 | 620-955 | 1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | T-MOBILE USA, INC. | 6529 | KINGMAN | KS |
| — | 620-217 | 2XXX7XXX which blocks → | T-MOBILE USA, INC. | 6529 | HESSTON | KS |
| — | 620-262 | 0–9 XXXall 10 · 5 holders which blocks → | T-MOBILE USA, INC. | 6529 | WINFIELD | KS |
| — | 620-474 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | HUTCHINSON | KS |
| — | 620-480 | 2XXX3XXX4XXX5XXX6XXX8XXX · 5 holders which blocks → | T-MOBILE USA, INC. | 6529 | MCPHERSON | KS |
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.