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 |
|---|---|---|---|---|---|---|
| 2022-03-14 | 413-646 | 1XXX4XXX · 2 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | MILLERSFLS | MA |
| 2022-02-28 | 413-673 | 0–9 XXXall 10 · 6 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | GREATBNGTN | MA |
| 2022-02-24 | 413-966 | 0–9 XXXall 10 · 4 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | NORTHAMPTN | MA |
| 2022-02-23 | 413-843 | 0XXX3XXX · 2 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | LENOX | MA |
| 2022-02-23 | 413-872 | 2XXX which blocks → | TON80 COMMUNICATIONS, LLC | 516J | DALTON | MA |
| 2022-02-23 | 413-933 | 1XXX3XXX · 2 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | MONROE BDG | MA |
| 2022-02-17 | 413-742 | 6XXX which blocks → | TON80 COMMUNICATIONS, LLC | 516J | ASHFIELD | MA |
| 2022-02-17 | 413-833 | 3XXX which blocks → | TON80 COMMUNICATIONS, LLC | 516J | BERNARDSTN | MA |
| 2022-02-17 | 413-942 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX · 3 holders which blocks → | TON80 COMMUNICATIONS, LLC | 516J | COLRAIN | 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.