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 |
|---|---|---|---|---|---|---|
| 2025-04-07 | 408-408 | 0–9 XXXall 10 · 2 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SNJS WEST | CA |
| 2012-03-16 | 408-664 | 0–9 XXXall 10 · 5 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SUNNYVALE | CA |
| 2011-07-08 | 408-783 | 0–9 XXXwhole prefix which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SNJS WEST | CA |
| — | 408-352 | 4XXX5XXX6XXX8XXX · 3 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SNJS WEST | CA |
| — | 408-427 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | GILROY | CA |
| — | 408-470 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SUNNYVALE | CA |
| — | 408-518 | 0XXX1XXX2XXX3XXX8XXX9XXX · 5 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SNJS NORTH | CA |
| — | 408-647 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SARATOGA | CA |
| — | 408-678 | none assigned yet which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SNJS NORTH | CA |
| — | 408-705 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SNJS SOUTH | CA |
| — | 408-825 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | MORGANHILL | CA |
| — | 408-826 | 1XXX2XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SNJS SOUTH | CA |
| — | 408-827 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | LOS GATOS | CA |
| — | 408-862 | not yet reported which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SNJS WEST | CA |
| — | 408-904 | 8XXX9XXX · 2 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SNJS NORTH | CA |
| — | 408-960 | 1XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SNJS SOUTH | CA |
| — | 408-961 | not yet reported which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SNJS WEST | CA |
| — | 408-962 | none assigned yet which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SUNNYVALE | CA |
| — | 408-963 | 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | CAMPBELL | CA |
| — | 408-964 | 0XXX8XXX which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SNJS NORTH | CA |
| — | 408-974 | not yet reported which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SNJS WEST | CA |
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.