NumberResearchThousands-blocks in 301-291
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 301-291 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 301 blocks
Most active assignees, all time — NPA 301
New assignments by month
Sep 2026
Aug 2026
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Jun 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2018-10-11 | 301-291-0XXX | 0000–0999 | Assigned | CORE COMMUNICATIONS, INC.- MD | 2593 | WSNG236Z14 | MD |
| 2016-10-17 | 301-291-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | WSNG236Z14 | MD |
| 2003-06-26 | 301-291-2XXX | 2000–2999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | 7529 | WSNG236Z14 | MD |
| 2018-10-11 | 301-291-3XXX | 3000–3999 | Assigned | CORE COMMUNICATIONS, INC.- MD | 2593 | WSNG236Z14 | MD |
| 2018-10-11 | 301-291-4XXX | 4000–4999 | Assigned | CORE COMMUNICATIONS, INC.- MD | 2593 | WSNG236Z14 | MD |
| 2012-07-16 | 301-291-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | WSNG236Z14 | MD |
| 2019-06-26 | 301-291-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | WSNG236Z14 | MD |
| 2004-10-20 | 301-291-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | WSNG236Z14 | MD |
| 2016-12-30 | 301-291-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | WSNG236Z14 | MD |
| — | 301-291-9XXX | 9000–9999 | Reserved | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | WSNG236Z14 | MD |
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.