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 |
|---|---|---|---|---|---|---|
| 2021-10-15 | 520-699 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | FRACTEL, LLC | 965H | SIERRAVIST | AZ |
| 2021-09-15 | 520-688 | 0–9 XXXall 10 · 4 holders which blocks → | FRACTEL, LLC | 965H | CASAGRANDE | AZ |
| 2020-10-19 | 520-758 | 6XXX which blocks → | FRACTEL, LLC | 965H | BLACKWATER | AZ |
| 2020-10-19 | 520-966 | 3XXX6XXX9XXX · 3 holders which blocks → | FRACTEL, LLC | 965H | SILVERBELL | AZ |
| 2020-09-24 | 520-588 | 5XXX8XXX · 2 holders which blocks → | FRACTEL, LLC | 965H | CASCABEL | AZ |
| 2020-09-24 | 520-644 | 4XXX6XXX · 2 holders which blocks → | FRACTEL, LLC | 965H | KOMATKE | AZ |
| 2020-09-24 | 520-755 | 1XXX5XXX7XXX · 3 holders which blocks → | FRACTEL, LLC | 965H | LONE BUTTE | AZ |
| 2020-09-24 | 520-899 | 8XXX9XXX · 2 holders which blocks → | FRACTEL, LLC | 965H | MARCOPAVLG | AZ |
| 2020-06-02 | 520-522 | 2XXX5XXX7XXX · 3 holders which blocks → | FRACTEL, LLC | 965H | CASABLANCA | AZ |
| 2020-06-02 | 520-655 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | FRACTEL, LLC | 965H | SUPERIOR | AZ |
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.