NumberResearchThousands-blocks in 320-356
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 320-356 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 320 blocks
Most active assignees, all time — NPA 320
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 |
|---|---|---|---|---|---|---|---|
| 2008-11-04 | 320-356-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - MN | 980E | AVON | MN |
| — | 320-356-1XXX | 1000–1999 | Reserved | QWEST CORPORATION | 9631 | AVON | MN |
| — | 320-356-2XXX | 2000–2999 | Reserved | QWEST CORPORATION | 9631 | AVON | MN |
| 2006-10-19 | 320-356-3XXX | 3000–3999 | Assigned | ONVOY, LLC - MN | 184D | AVON | MN |
| 2017-05-16 | 320-356-4XXX | 4000–4999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | AVON | MN |
| 2007-02-20 | 320-356-5XXX | 5000–5999 | Assigned | ONVOY, LLC - MN | 184D | AVON | MN |
| 2008-01-16 | 320-356-6XXX | 6000–6999 | Assigned | ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM | 7770 | AVON | MN |
| — | 320-356-7XXX | 7000–7999 | Reserved | QWEST CORPORATION | 9631 | AVON | MN |
| 2004-11-17 | 320-356-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MN | 5256 | AVON | MN |
| — | 320-356-9XXX | 9000–9999 | Reserved | QWEST CORPORATION | 9631 | AVON | MN |
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.