NumberResearchThousands-blocks in 301-458
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 301-458 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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2008-11-17 | 301-458-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | WSHNGTNZN4 | MD |
| 2015-08-07 | 301-458-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 6395 | WSHNGTNZN4 | MD |
| — | 301-458-2XXX | 2000–2999 | Reserved | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | 7529 | WSHNGTNZN4 | MD |
| 2016-01-28 | 301-458-3XXX | 3000–3999 | Assigned | ONVOY, LLC - MD | 876D | WSHNGTNZN4 | MD |
| — | 301-458-4XXX | 4000–4999 | Reserved | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | 7529 | WSHNGTNZN4 | MD |
| 2013-03-28 | 301-458-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 6395 | WSHNGTNZN4 | MD |
| 2010-07-21 | 301-458-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | WSHNGTNZN4 | MD |
| 2008-09-24 | 301-458-7XXX | 7000–7999 | Assigned | YMAX COMMUNICATIONS CORP. - MD | 281E | WSHNGTNZN4 | MD |
| 2010-07-21 | 301-458-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | WSHNGTNZN4 | MD |
| 2014-11-13 | 301-458-9XXX | 9000–9999 | Assigned | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 6855 | WSHNGTNZN4 | MD |
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.