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 |
|---|---|---|---|---|---|---|
| 2021-03-18 | 432-306 | 0–9 XXXall 10 · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | BIG SPRING | TX |
| 2006-10-26 | 432-212 | 0–9 XXXall 10 · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | TERMINAL | TX |
| 2006-01-06 | 432-603 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → | T-MOBILE USA, INC. | 6529 | VAN HORN | TX |
| 2005-09-09 | 432-755 | 0–9 XXXall 10 · 6 holders which blocks → | T-MOBILE USA, INC. | 6529 | PECOS | TX |
| 2004-08-18 | 432-599 | 0–9 XXXwhole prefix which blocks → | T-MOBILE USA, INC. | 6529 | MIDLAND | TX |
| 2002-09-25 | 432-201 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | SEMINOLE | TX |
| 2001-10-12 | 432-978 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → | T-MOBILE USA, INC. | 6529 | TERMINAL | TX |
| 2001-08-22 | 432-967 | 5XXX6XXX7XXX8XXX9XXX which blocks → | T-MOBILE USA, INC. | 6529 | TERMINAL | TX |
| 2001-03-13 | 432-923 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | T-MOBILE USA, INC. | 6529 | MONAHANS | TX |
| 2001-03-13 | 432-924 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | ODESSA | TX |
| 2001-02-12 | 432-416 | 1XXX2XXX3XXX4XXX5XXX8XXX9XXX which blocks → | T-MOBILE USA, INC. | 6529 | MIDLAND | TX |
| — | 432-816 | 0XXX2XXX which blocks → | T-MOBILE USA, INC. | 6529 | BIG SPRING | 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.