NumberResearchThousands-blocks in 304-397
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 304-397 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 304 blocks
Most active assignees, all time — NPA 304
New assignments by month
Sep 2026
Aug 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2008-10-27 | 304-397-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - WV | 080F | HURRICANE | WV |
| — | 304-397-1XXX | 1000–1999 | Available | HURRICANE | WV | ||
| 2004-07-01 | 304-397-2XXX | 2000–2999 | Assigned | CITYNET WEST VIRGINIA, LLC - WV | 545B | HURRICANE | WV |
| 2004-05-17 | 304-397-3XXX | 3000–3999 | Assigned | LUMOS NETWORKS INC. - VA | 7849 | HURRICANE | WV |
| 2004-10-07 | 304-397-4XXX | 4000–4999 | Assigned | FIBERNET, LLC - WV | 4095 | HURRICANE | WV |
| 2004-10-21 | 304-397-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - WV | 9944 | HURRICANE | WV |
| 2006-09-20 | 304-397-6XXX | 6000–6999 | Assigned | CSC VOICE, LLC | 612K | HURRICANE | WV |
| 2009-09-01 | 304-397-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HURRICANE | WV |
| 2011-02-25 | 304-397-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - WV | 9944 | HURRICANE | WV |
| 2025-05-30 | 304-397-9XXX | 9000–9999 | Assigned | COMCAST IP PHONE, LLC | 318J | HURRICANE | WV |
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.