NumberResearchThousands-blocks in 337-381
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 337-381 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 337 blocks
Most active assignees, last 30 days — NPA 337
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 |
|---|---|---|---|---|---|---|---|
| — | 337-381-0XXX | 0000–0999 | Reserved | LEVEL 3 TELECOM OF LOUISIANA, LLC - LA | 7488 | OPELOUSAS | LA |
| 2020-03-25 | 337-381-1XXX | 1000–1999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | OPELOUSAS | LA |
| 2007-02-05 | 337-381-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - LA | 8764 | OPELOUSAS | LA |
| 2010-05-25 | 337-381-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - LA | 153F | OPELOUSAS | LA |
| 2011-10-14 | 337-381-4XXX | 4000–4999 | Assigned | VOICESTREAM GSM I, LLC | 150C | OPELOUSAS | LA |
| 2008-03-24 | 337-381-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - LA | 3232 | OPELOUSAS | LA |
| 2011-10-14 | 337-381-6XXX | 6000–6999 | Assigned | VOICESTREAM GSM I, LLC | 150C | OPELOUSAS | LA |
| 2008-10-21 | 337-381-7XXX | 7000–7999 | Assigned | ONVOY, LLC - LA | 749E | OPELOUSAS | LA |
| 2026-09-10 | 337-381-8XXX | 8000–8999 | Assigned | ONVOY, LLC - LA | 749E | OPELOUSAS | LA |
| 2026-09-10 | 337-381-9XXX | 9000–9999 | Assigned | ONVOY, LLC - LA | 749E | OPELOUSAS | LA |
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.