NumberResearchThousands-blocks in 406-219
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/20/2026
The ten 1,000-number thousand-blocks inside prefix 406-219 and who was initially assigned each. Under pooling these blocks often belong to different carriers — the single prefix-level “assignee” is usually just the pool / code holder, not who holds the numbers. ← all 406 blocks
Most active assignees, all time — NPA 406
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2006-10-06 | 406-219-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | BOZEMAN | MT |
| 2010-01-22 | 406-219-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | BOZEMAN | MT |
| 2014-05-15 | 406-219-2XXX | 2000–2999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | BOZEMAN | MT |
| 2006-12-08 | 406-219-3XXX | 3000–3999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | BOZEMAN | MT |
| 2010-05-19 | 406-219-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | BOZEMAN | MT |
| 2010-09-22 | 406-219-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | BOZEMAN | MT |
| 2021-08-27 | 406-219-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | BOZEMAN | MT |
| 2011-03-04 | 406-219-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | BOZEMAN | MT |
| 2011-05-24 | 406-219-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | BOZEMAN | MT |
| 2025-11-06 | 406-219-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | BOZEMAN | MT |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.