NumberResearchThousands-blocks in 401-535
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 401-535 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, last 30 days — NPA 401
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
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Apr 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2022-11-23 | 401-535-0XXX | 0000–0999 | Assigned | ONVOY, LLC - RI | 977E | W WARWICK | RI |
| — | 401-535-1XXX | 1000–1999 | Reserved | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7351 | W WARWICK | RI |
| 2026-08-04 | 401-535-2XXX | 2000–2999 | Assigned | ONVOY SPECTRUM, LLC | 624H | W WARWICK | RI |
| 2021-03-17 | 401-535-3XXX | 3000–3999 | Assigned | ONVOY SPECTRUM, LLC | 624H | W WARWICK | RI |
| — | 401-535-4XXX | 4000–4999 | Reserved | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7351 | W WARWICK | RI |
| 2020-10-15 | 401-535-5XXX | 5000–5999 | Assigned | TERRA NOVA TELECOM INC. | 145J | W WARWICK | RI |
| 2022-01-14 | 401-535-6XXX | 6000–6999 | Assigned | ONVOY SPECTRUM, LLC | 624H | W WARWICK | RI |
| 2022-01-14 | 401-535-7XXX | 7000–7999 | Assigned | ONVOY SPECTRUM, LLC | 624H | W WARWICK | RI |
| 2026-08-26 | 401-535-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - RI | 4016 | W WARWICK | RI |
| 2024-01-29 | 401-535-9XXX | 9000–9999 | Assigned | ONVOY, LLC - RI | 977E | W WARWICK | 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.