NumberResearchThousands-blocks in 401-203
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 401-203 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 401 blocks
Most active assignees, all time — NPA 401
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2008-08-27 | 401-203-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - RI | 4016 | GREENWICH | RI |
| — | 401-203-1XXX | 1000–1999 | Reserved | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | GREENWICH | RI |
| 2007-09-20 | 401-203-2XXX | 2000–2999 | Assigned | PAETEC ITEL, LLC | 829J | GREENWICH | RI |
| 2010-01-29 | 401-203-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - RI | 003F | GREENWICH | RI |
| 2010-08-05 | 401-203-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - RI | 003F | GREENWICH | RI |
| 2011-01-24 | 401-203-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - RI | 003F | GREENWICH | RI |
| — | 401-203-6XXX | 6000–6999 | Reserved | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | GREENWICH | RI |
| 2011-06-01 | 401-203-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - RI | 003F | GREENWICH | RI |
| 2015-02-02 | 401-203-8XXX | 8000–8999 | Assigned | PEERLESS NETWORK OF RHODE ISLAND, LLC - RI | 631G | GREENWICH | RI |
| — | 401-203-9XXX | 9000–9999 | Reserved | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | GREENWICH | RI |
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.