NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026
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 |
|---|---|---|---|---|---|---|
| 2023-07-18 | 339-239 | 0XXX1XXX2XXX3XXX6XXX8XXX · 4 holders which blocks → | ONVOY, LLC - MA | 892D | BRYANTVL | MA |
| 2021-06-11 | 339-232 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | ONVOY, LLC - MA | 892D | DUXBURY | MA |
| 2021-03-30 | 339-329 | 0–9 XXXall 10 · 2 holders which blocks → | ONVOY, LLC - MA | 892D | MARBLEHEAD | MA |
| 2021-03-30 | 339-330 | 0–9 XXXall 10 · 2 holders which blocks → | ONVOY, LLC - MA | 892D | BRYANTVL | MA |
| 2021-01-25 | 339-500 | 0–9 XXXall 10 · 4 holders which blocks → | ONVOY, LLC - MA | 892D | LYNN | MA |
| 2020-12-07 | 339-255 | 0–9 XXXall 10 · 3 holders which blocks → | ONVOY, LLC - MA | 892D | WEYMOUTH | MA |
| 2020-06-16 | 339-331 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | ONVOY, LLC - MA | 892D | DUXBURY | MA |
| 2017-08-31 | 339-666 | 0–9 XXXall 10 · 3 holders which blocks → | ONVOY, LLC - MA | 892D | LYNN | MA |
| 2016-03-03 | 339-210 | 0–9 XXXall 10 · 8 holders which blocks → | ONVOY, LLC - MA | 892D | SAUGUS | MA |
| 2016-03-03 | 339-215 | 0–9 XXXall 10 · 6 holders which blocks → | ONVOY, LLC - MA | 892D | LEXINGTON | MA |
| 2015-12-28 | 339-209 | 0–9 XXXall 10 · 3 holders which blocks → | ONVOY, LLC - MA | 892D | WEYMOUTH | MA |
| 2015-12-17 | 339-207 | 0–9 XXXall 10 · 4 holders which blocks → | ONVOY, LLC - MA | 892D | LYNN | MA |
| 2015-03-25 | 339-444 | 0–9 XXXwhole prefix which blocks → | ONVOY, LLC - MA | 892D | SAUGUS | MA |
| 2015-03-23 | 339-888 | 0–9 XXXwhole prefix which blocks → | ONVOY, LLC - MA | 892D | LYNN | MA |
| — | 339-333 | 0–9 XXXall 10 · 7 holders which blocks → | ONVOY, LLC - MA | 892D | LINCOLN | MA |
| — | 339-777 | 0–9 XXXall 10 · 5 holders which blocks → | ONVOY, LLC - MA | 892D | NEEDHAM | MA |
| — | 339-900 | 0–9 XXXall 10 · 4 holders which blocks → | ONVOY, LLC - MA | 892D | MARSHFIELD | MA |
| — | 339-999 | 0–9 XXXall 10 · 3 holders which blocks → | ONVOY, LLC - MA | 892D | WOBURN | MA |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.