NumberResearchThousands-blocks in 304-409
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 304-409 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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2018-04-20 | 304-409-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | BLUEWELL | WV |
| 2008-05-07 | 304-409-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - WV | 9944 | BLUEWELL | WV |
| 2012-03-14 | 304-409-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - WV | 9944 | BLUEWELL | WV |
| 2012-11-12 | 304-409-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BLUEWELL | WV |
| 2002-12-12 | 304-409-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - WV | 9944 | BLUEWELL | WV |
| 2013-02-28 | 304-409-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | BLUEWELL | WV |
| 2013-01-09 | 304-409-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - WV | 9944 | BLUEWELL | WV |
| 2014-12-04 | 304-409-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - WV | 9944 | BLUEWELL | WV |
| 2018-04-20 | 304-409-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | BLUEWELL | WV |
| 2018-04-20 | 304-409-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | BLUEWELL | 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.