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 |
|---|---|---|---|---|---|---|
| 2022-12-08 | 608-817 | 0–9 XXXall 10 · 2 holders which blocks → | BANDWIDTH.COM CLEC, LLC - WI | 007F | MADISON | WI |
| 2022-01-18 | 608-801 | 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | BANDWIDTH.COM CLEC, LLC - WI | 007F | DE FOREST | WI |
| 2021-11-12 | 608-601 | 0XXX1XXX2XXX4XXX8XXX9XXX · 3 holders which blocks → | BANDWIDTH.COM CLEC, LLC - WI | 007F | MCFARLAND | WI |
| 2020-09-03 | 608-389 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | BANDWIDTH.COM CLEC, LLC - WI | 007F | BARABOO | WI |
| 2019-08-01 | 608-684 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX · 5 holders which blocks → | BANDWIDTH.COM CLEC, LLC - WI | 007F | FOOTVILLE | WI |
| 2017-09-28 | 608-912 | 0–9 XXXall 10 · 7 holders which blocks → | BANDWIDTH.COM CLEC, LLC - WI | 007F | DE FOREST | WI |
| 2015-02-17 | 608-909 | 0–9 XXXall 10 · 6 holders which blocks → | BANDWIDTH.COM CLEC, LLC - WI | 007F | OREGON | WI |
| 2015-01-26 | 608-688 | 0–9 XXXall 10 · 5 holders which blocks → | BANDWIDTH.COM CLEC, LLC - WI | 007F | COTTAGEGRV | WI |
| 2014-12-04 | 608-496 | 0XXX1XXX4XXX8XXX9XXX · 3 holders which blocks → | BANDWIDTH.COM CLEC, LLC - WI | 007F | CAMBRIDGE | WI |
| 2014-09-17 | 608-447 | 0–9 XXXall 10 · 5 holders which blocks → | BANDWIDTH.COM CLEC, LLC - WI | 007F | BRODHEAD | WI |
| 2012-12-07 | 608-618 | 0–9 XXXall 10 · 3 holders which blocks → | BANDWIDTH.COM CLEC, LLC - WI | 007F | EDGERTON | WI |
| 2010-09-07 | 608-520 | 0–9 XXXall 10 · 2 holders which blocks → | BANDWIDTH.COM CLEC, LLC - WI | 007F | MADISON | WI |
| 2010-08-06 | 608-535 | 0–9 XXXall 10 · 4 holders which blocks → | BANDWIDTH.COM CLEC, LLC - WI | 007F | MADISON | WI |
| 2008-10-10 | 608-616 | 0–9 XXXall 10 · 4 holders which blocks → | BANDWIDTH.COM CLEC, LLC - WI | 007F | MADISON | WI |
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.