NumberResearchThousands-blocks in 304-310
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026
The ten 1,000-number thousand-blocks inside prefix 304-310 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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2024-09-17 | 304-310-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | CHAPMANVL | WV |
| 2010-02-09 | 304-310-1XXX | 1000–1999 | Assigned | ARMSTRONG TELECOMMUNICATIONS, INC. - WV | 423C | CHAPMANVL | WV |
| 2014-01-16 | 304-310-2XXX | 2000–2999 | Assigned | CSC VOICE, LLC | 612K | CHAPMANVL | WV |
| 2018-05-25 | 304-310-3XXX | 3000–3999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - WV | 077G | CHAPMANVL | WV |
| 2006-09-20 | 304-310-4XXX | 4000–4999 | Assigned | CSC VOICE, LLC | 612K | CHAPMANVL | WV |
| 2015-08-28 | 304-310-5XXX | 5000–5999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | CHAPMANVL | WV |
| 2014-09-16 | 304-310-6XXX | 6000–6999 | Assigned | LUMOS NETWORKS INC. - VA | 7849 | CHAPMANVL | WV |
| 2004-08-24 | 304-310-7XXX | 7000–7999 | Assigned | CITYNET WEST VIRGINIA, LLC - WV | 545B | CHAPMANVL | WV |
| 2016-12-06 | 304-310-8XXX | 8000–8999 | Assigned | SHENTEL COMMUNICATIONS, LLC. - WV | 489F | CHAPMANVL | WV |
| 2018-12-07 | 304-310-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | CHAPMANVL | WV |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.