NumberResearchThousands-blocks in 863-578
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 863-578 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 863 blocks
Most active assignees, all time — NPA 863
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2004-12-13 | 863-578-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | BARTOW | FL |
| — | 863-578-1XXX | 1000–1999 | Reserved | TELEPORT COMMUNICATIONS AMERICA, LLC - FL | 8300 | BARTOW | FL |
| 2016-04-13 | 863-578-2XXX | 2000–2999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - FL | 8300 | BARTOW | FL |
| 2005-12-08 | 863-578-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | BARTOW | FL |
| 2004-03-12 | 863-578-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | BARTOW | FL |
| 2005-03-30 | 863-578-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | BARTOW | FL |
| 2006-11-15 | 863-578-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | BARTOW | FL |
| 2019-05-07 | 863-578-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - FL | 982E | BARTOW | FL |
| 2011-07-21 | 863-578-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - FL | 982E | BARTOW | FL |
| 2017-11-20 | 863-578-9XXX | 9000–9999 | Assigned | METROPCS NETWORKS, LLC | 899D | BARTOW | FL |
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.