NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/21/2026
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 |
|---|---|---|---|---|---|---|
| — | 440-265 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | CONNEAUT | OH |
| — | 440-336 | 8XXX9XXX · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | WILLOUGHBY | OH |
| — | 440-339 | 2XXX which blocks → | T-MOBILE USA, INC. | 6529 | PAINESVL | OH |
| — | 440-343 | 8XXX9XXX · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | WILLOUGHBY | OH |
| — | 440-452 | 0XXX which blocks → | T-MOBILE USA, INC. | 6529 | ELYRIA | OH |
| — | 440-453 | 0XXX1XXX2XXX which blocks → | T-MOBILE USA, INC. | 6529 | ELYRIA | OH |
| — | 440-503 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | BEREA | OH |
| — | 440-574 | 0XXX5XXX6XXX7XXX · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | OBERLIN | OH |
| — | 440-653 | 2XXX4XXX5XXX8XXX9XXX · 5 holders which blocks → | T-MOBILE USA, INC. | 6529 | AVON LAKE | OH |
| — | 440-742 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → | T-MOBILE USA, INC. | 6529 | WILLOUGHBY | OH |
| — | 440-796 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | PAINESVL | OH |
| — | 440-915 | 0XXX which blocks → | T-MOBILE USA, INC. | 6529 | BEREA | OH |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.