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 |
|---|---|---|---|---|---|---|
| — | 830-730 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | SOUTHWESTERN BELL | 9533 | NEWBRANFLS | TX |
| — | 830-741 | 0XXX1XXX4XXX5XXX9XXX · 2 holders which blocks → | SOUTHWESTERN BELL | 9533 | HONDO | TX |
| — | 830-742 | 0XXX2XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → | SOUTHWESTERN BELL | 9533 | POTEET | TX |
| — | 830-751 | 4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | SOUTHWESTERN BELL | 9533 | MEDINALAKE | TX |
| — | 830-752 | 0XXX2XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → | SOUTHWESTERN BELL | 9533 | EAGLE PASS | TX |
| — | 830-757 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | EAGLE PASS | TX |
| — | 830-758 | 9XXX which blocks → | SOUTHWESTERN BELL | 9533 | EAGLE PASS | TX |
| — | 830-762 | 0XXX2XXX4XXX5XXX7XXX · 5 holders which blocks → | SOUTHWESTERN BELL | 9533 | LACOSTE | TX |
| — | 830-772 | 0XXX6XXX8XXX · 2 holders which blocks → | SOUTHWESTERN BELL | 9533 | LYTLE | TX |
| — | 830-773 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | EAGLE PASS | TX |
| — | 830-780 | 6XXX7XXX8XXX9XXX · 3 holders which blocks → | SOUTHWESTERN BELL | 9533 | KARNESCITY | TX |
| — | 830-784 | 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | SOUTHWESTERN BELL | 9533 | CHRISTINE | TX |
| — | 830-796 | 2XXX which blocks → | SOUTHWESTERN BELL | 9533 | BANDERA | TX |
| — | 830-875 | 0XXX4XXX7XXX · 3 holders which blocks → | SOUTHWESTERN BELL | 9533 | LULING | TX |
| — | 830-876 | none assigned yet which blocks → | SOUTHWESTERN BELL | 9533 | CARRIZOSPG | TX |
| — | 830-879 | 0XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | SOUTHWESTERN BELL | 9533 | COTULLA | TX |
| — | 830-914 | 0XXX5XXX9XXX · 3 holders which blocks → | SOUTHWESTERN BELL | 9533 | MARION | TX |
| — | 830-931 | 1XXX6XXX7XXX8XXX · 3 holders which blocks → | SOUTHWESTERN BELL | 9533 | CASTROVL | TX |
| — | 830-985 | 5XXX6XXX7XXX8XXX · 2 holders which blocks → | SOUTHWESTERN BELL | 9533 | LACOSTE | TX |
| — | 830-988 | 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | SOUTHWESTERN BELL | 9533 | SABINAL | TX |
| — | 830-999 | 0XXX2XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → | SOUTHWESTERN BELL | 9533 | CATARINA | 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.