NumberResearchThousands-blocks in 304-307
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 304-307 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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Jun 2026
May 2026
Apr 2026
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Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2004-07-01 | 304-307-0XXX | 0000–0999 | Assigned | CITYNET WEST VIRGINIA, LLC - WV | 545B | MADISON | WV |
| 2013-07-30 | 304-307-1XXX | 1000–1999 | Assigned | CORETEL WEST VIRGINIA, INC. - WV | 5833 | MADISON | WV |
| 2014-01-22 | 304-307-2XXX | 2000–2999 | Assigned | CSC VOICE, LLC | 612K | MADISON | WV |
| 2009-09-01 | 304-307-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MADISON | WV |
| 2006-09-20 | 304-307-4XXX | 4000–4999 | Assigned | CSC VOICE, LLC | 612K | MADISON | WV |
| 2012-07-05 | 304-307-5XXX | 5000–5999 | Assigned | ARMSTRONG TELECOMMUNICATIONS, INC. - WV | 423C | MADISON | WV |
| 2005-02-25 | 304-307-6XXX | 6000–6999 | Assigned | FIBERNET, LLC - WV | 4095 | MADISON | WV |
| 2015-08-31 | 304-307-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - WV | 9944 | MADISON | WV |
| 2015-10-14 | 304-307-8XXX | 8000–8999 | Assigned | SHENTEL COMMUNICATIONS, LLC. - WV | 489F | MADISON | WV |
| 2020-10-08 | 304-307-9XXX | 9000–9999 | Assigned | HD CARRIER LLC | 321J | MADISON | 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.