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 |
|---|---|---|---|---|---|---|
| 2014-05-07 | 818-965 | 0–9 XXXall 10 · 4 holders which blocks → | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | CANOGAPARK | CA |
| — | 818-201 | 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | RESEDA | CA |
| — | 818-239 | 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | BRBN BRBN | CA |
| — | 818-264 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | CANOGAPARK | CA |
| — | 818-280 | 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | NORTHRIDGE | CA |
| — | 818-285 | 8XXX9XXX · 2 holders which blocks → | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | VAN NUYS | CA |
| — | 818-330 | 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | LACRSCENTA | CA |
| — | 818-333 | 6XXX which blocks → | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | BRBN BRBN | CA |
| — | 818-408 | 0XXX1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | SNFN SNFN | CA |
| — | 818-432 | not yet reported which blocks → | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | NO HOLLYWD | CA |
| — | 818-444 | not yet reported which blocks → | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | CANOGAPARK | CA |
| — | 818-465 | 0XXX2XXX3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks → | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | VAN NUYS | CA |
| — | 818-466 | 0XXX1XXX3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks → | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | CANOGAPARK | CA |
| — | 818-534 | 6XXX7XXX8XXX · 2 holders which blocks → | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | NORTHRIDGE | CA |
| — | 818-630 | 3XXX4XXX5XXX9XXX · 4 holders which blocks → | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | GLENDALE | CA |
| — | 818-657 | 0XXX1XXX2XXX7XXX8XXX9XXX · 6 holders which blocks → | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | CANOGAPARK | CA |
| — | 818-671 | 0–9 XXXall 10 · 5 holders which blocks → | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | NORTHRIDGE | CA |
| — | 818-721 | 0XXX1XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | NORTHRIDGE | CA |
| — | 818-746 | 0–9 XXXall 10 · 6 holders which blocks → | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | CANOGAPARK | CA |
| — | 818-844 | 6XXX7XXX which blocks → | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | GLENDALE | CA |
| — | 818-861 | 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | BRBN BRBN | CA |
| — | 818-933 | 1XXX which blocks → | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | VAN NUYS | CA |
| — | 818-942 | 3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | NO HOLLYWD | 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.