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 |
|---|---|---|---|---|---|---|
| — | 432-580 | 6XXX9XXX which blocks → | SOUTHWESTERN BELL | 9533 | ODESSA | TX |
| — | 432-582 | 0XXX1XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → | SOUTHWESTERN BELL | 9533 | ODESSA | TX |
| — | 432-586 | 0XXX4XXX7XXX9XXX · 4 holders which blocks → | SOUTHWESTERN BELL | 9533 | KERMIT | TX |
| — | 432-620 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | MIDLAND | TX |
| — | 432-639 | 0XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → | SOUTHWESTERN BELL | 9533 | IRAAN | TX |
| — | 432-640 | 7XXX9XXX which blocks → | SOUTHWESTERN BELL | 9533 | TERMINAL | TX |
| — | 432-652 | 0XXX2XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → | SOUTHWESTERN BELL | 9533 | MCCAMEY | TX |
| — | 432-681 | 0XXX which blocks → | SOUTHWESTERN BELL | 9533 | MIDLAND | TX |
| — | 432-682 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | MIDLAND | TX |
| — | 432-683 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | MIDLAND | TX |
| — | 432-684 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | MIDLAND | TX |
| — | 432-685 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | MIDLAND | TX |
| — | 432-686 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | MIDLAND | TX |
| — | 432-687 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | MIDLAND | TX |
| — | 432-688 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | MIDLAND | TX |
| — | 432-689 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | MIDLAND | TX |
| — | 432-693 | 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | SOUTHWESTERN BELL | 9533 | RANKIN | TX |
| — | 432-694 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | MIDLAND | TX |
| — | 432-697 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | MIDLAND | TX |
| — | 432-699 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | MIDLAND | TX |
| — | 432-729 | 0XXX2XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | SOUTHWESTERN BELL | 9533 | MARFA | TX |
| — | 432-741 | 0XXX1XXX2XXX3XXX5XXX9XXX · 3 holders which blocks → | SOUTHWESTERN BELL | 9533 | TERMINAL | TX |
| — | 432-742 | none assigned yet which blocks → | SOUTHWESTERN BELL | 9533 | MIDLAND | TX |
| — | 432-756 | 0XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | SOUTHWESTERN BELL | 9533 | STANTON | TX |
| — | 432-758 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | SEMINOLE | TX |
| — | 432-818 | 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | SOUTHWESTERN BELL | 9533 | MIDLAND | TX |
| — | 432-827 | 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | SOUTHWESTERN BELL | 9533 | GOLDSMITH | TX |
| — | 432-837 | 4XXX which blocks → | SOUTHWESTERN BELL | 9533 | ALPINE | TX |
| — | 432-943 | 0XXX which blocks → | SOUTHWESTERN BELL | 9533 | MONAHANS | 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.