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 |
|---|---|---|---|---|---|---|
| — | 713-968 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| — | 713-970 | 1XXX which blocks → | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| — | 713-972 | 2XXX4XXX5XXX6XXX · 2 holders which blocks → | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| — | 713-973 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| — | 713-974 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| — | 713-975 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| — | 713-977 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| — | 713-978 | 0XXX which blocks → | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| — | 713-981 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| — | 713-982 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| — | 713-983 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | HSTNSUBURB | TX |
| — | 713-984 | 4XXX which blocks → | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| — | 713-985 | 0XXX9XXX · 2 holders which blocks → | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| — | 713-987 | 3XXX4XXX7XXX8XXX · 3 holders which blocks → | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| — | 713-988 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| — | 713-989 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| — | 713-991 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| — | 713-993 | 6XXX7XXX · 2 holders which blocks → | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| — | 713-994 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| — | 713-995 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
| — | 713-996 | not yet reported which blocks → | SOUTHWESTERN BELL | 9533 | HOUSTON | TX |
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.