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 |
|---|---|---|---|---|---|---|
| — | 972-933 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | GRANDPRARI | TX |
| — | 972-934 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | DALLAS | TX |
| — | 972-935 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | WAXAHACHIE | TX |
| — | 972-937 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | WAXAHACHIE | TX |
| — | 972-938 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | WAXAHACHIE | TX |
| — | 972-943 | not yet reported which blocks → | SOUTHWESTERN BELL TELEPHONE COMPANY - TX | 7726 | PLANO | TX |
| — | 972-946 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → | SOUTHWESTERN BELL | 9533 | GRANDPRARI | TX |
| — | 972-949 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | GRANDPRARI | TX |
| — | 972-952 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | DALLAS | TX |
| — | 972-953 | 5XXX6XXX7XXX8XXX9XXX which blocks → | SOUTHWESTERN BELL TELEPHONE COMPANY - TX | 7726 | IRVING | TX |
| — | 972-956 | not yet reported which blocks → | SOUTHWESTERN BELL TELEPHONE COMPANY - TX | 7726 | LEWISVILLE | TX |
| — | 972-960 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | DALLAS | TX |
| — | 972-968 | 7XXX8XXX9XXX which blocks → | SOUTHWESTERN BELL | 9533 | DALLAS | TX |
| — | 972-969 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | DALLAS | TX |
| — | 972-975 | 0XXX2XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | SOUTHWESTERN BELL | 9533 | GRANDPRARI | TX |
| — | 972-980 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | DALLAS | TX |
| — | 972-982 | 0XXX2XXX7XXX8XXX · 3 holders which blocks → | SOUTHWESTERN BELL | 9533 | DALLAS | TX |
| — | 972-983 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → | SOUTHWESTERN BELL TELEPHONE COMPANY - TX | 7726 | IRVING | TX |
| — | 972-988 | 9XXX which blocks → | SOUTHWESTERN BELL | 9533 | GRANDPRARI | TX |
| — | 972-991 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | DALLAS | TX |
| — | 972-994 | 6XXX which blocks → | SOUTHWESTERN BELL | 9533 | DALLAS | TX |
| — | 972-995 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | DALLAS | TX |
| — | 972-996 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 2 holders which blocks → | SOUTHWESTERN BELL | 9533 | DALLAS | TX |
| — | 972-997 | 1XXX5XXX6XXX which blocks → | SOUTHWESTERN BELL | 9533 | DALLAS | 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.