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 |
|---|---|---|---|---|---|---|
| 2014-01-21 | 713-325 | 0–9 XXXall 10 · 4 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7138 | HOUSTON | TX |
| 2011-09-23 | 713-904 | 0–9 XXXall 10 · 5 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7138 | HOUSTON | TX |
| 2011-09-07 | 713-997 | 0–9 XXXall 10 · 3 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7138 | HOUSTON | TX |
| 2006-08-02 | 713-848 | 0–9 XXXwhole prefix which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7138 | HOUSTON | TX |
| — | 713-353 | not yet reported which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7138 | HOUSTON | TX |
| — | 713-431 | 1XXX2XXX · 2 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7138 | HOUSTON | TX |
| — | 713-570 | 6XXX9XXX · 2 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7138 | HSTNSUBURB | TX |
| — | 713-575 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7138 | HSTNSUBURB | TX |
| — | 713-576 | 6XXX9XXX which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7138 | HOUSTON | TX |
| — | 713-821 | not yet reported which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7138 | HOUSTON | TX |
| — | 713-830 | not yet reported which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7138 | HOUSTON | TX |
| — | 713-860 | not yet reported which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7138 | HOUSTON | TX |
| — | 713-986 | not yet reported which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7138 | 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.