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 |
|---|---|---|---|---|---|---|
| 2021-10-22 | 351-667 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → | FRACTEL, LLC | 965H | ACTON | MA |
| 2021-07-23 | 351-234 | 0–9 XXXall 10 · 6 holders which blocks → | FRACTEL, LLC | 965H | HAVERHILL | MA |
| 2021-04-26 | 351-345 | 0–9 XXXall 10 · 6 holders which blocks → | FRACTEL, LLC | 965H | HUDSON | MA |
| 2021-04-26 | 351-465 | 1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → | FRACTEL, LLC | 965H | MANCHESTER | MA |
| 2020-07-21 | 351-356 | 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | FRACTEL, LLC | 965H | LEOMINSTER | MA |
| 2020-05-08 | 351-400 | 0XXX2XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → | FRACTEL, LLC | 965H | ESSEX | MA |
| 2020-05-08 | 351-500 | 0–9 XXXall 10 · 4 holders which blocks → | FRACTEL, LLC | 965H | LOWELL | MA |
| 2020-05-08 | 351-529 | 0–9 XXXall 10 · 4 holders which blocks → | FRACTEL, LLC | 965H | MERRIMAC | MA |
| 2020-05-08 | 351-600 | 0–9 XXXall 10 · 5 holders which blocks → | FRACTEL, LLC | 965H | PEABODY | MA |
| 2020-05-08 | 351-800 | 0XXX1XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | FRACTEL, LLC | 965H | WINCHENDON | MA |
| 2020-05-08 | 351-900 | 0XXX1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | FRACTEL, LLC | 965H | IPSWICH | MA |
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.