NumberResearchThousands-blocks in 401-337
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 401-337 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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2023-07-28 | 401-337-0XXX | 0000–0999 | Assigned | TELNYX LLC | 073H | WARREN | RI |
| 2024-03-27 | 401-337-1XXX | 1000–1999 | Assigned | ONVOY, LLC - RI | 977E | WARREN | RI |
| 2004-11-18 | 401-337-2XXX | 2000–2999 | Assigned | PAETEC ITEL, LLC | 829J | WARREN | RI |
| 2021-03-17 | 401-337-3XXX | 3000–3999 | Assigned | ONVOY SPECTRUM, LLC | 624H | WARREN | RI |
| — | 401-337-4XXX | 4000–4999 | Available | WARREN | RI | ||
| 2009-10-19 | 401-337-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | WARREN | RI |
| — | 401-337-6XXX | 6000–6999 | Available | WARREN | RI | ||
| 2016-02-17 | 401-337-7XXX | 7000–7999 | Assigned | ONVOY, LLC - RI | 977E | WARREN | RI |
| 2016-02-17 | 401-337-8XXX | 8000–8999 | Assigned | ONVOY, LLC - RI | 977E | WARREN | RI |
| — | 401-337-9XXX | 9000–9999 | Reserved | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WARREN | 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.