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 |
|---|---|---|---|---|---|---|
| 2010-01-11 | 817-402 | 0–9 XXXall 10 · 5 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7148 | ALVARADO | TX |
| 2002-01-15 | 817-567 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7148 | ROANOKE | TX |
| — | 817-505 | 3XXX5XXX6XXX7XXX8XXX9XXX which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7148 | ARLINGTON | TX |
| — | 817-508 | 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7148 | EULESS | TX |
| — | 817-722 | 4XXX5XXX6XXX · 3 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7148 | GRAPEVINE | TX |
| — | 817-770 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7148 | NRICHLDHLS | TX |
| — | 817-775 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7148 | KENNEDALE | TX |
| — | 817-779 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7148 | MANSFIELD | TX |
| — | 817-799 | 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7148 | EULESS | TX |
| — | 817-806 | 4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7148 | FORT WORTH | TX |
| — | 817-840 | 3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7148 | FORT WORTH | TX |
| — | 817-859 | 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7148 | ROANOKE | TX |
| — | 817-880 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7148 | GLENDALE | TX |
| — | 817-893 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7148 | NRICHLDHLS | TX |
| — | 817-987 | 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7148 | ARLINGTON | 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.