NumberResearchThousands-blocks in 321-549
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 321-549 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 321 blocks
Most active assignees, all time — NPA 321
New assignments by month
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 321-549-0XXX | 0000–0999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | MELBOURNE | FL |
| 2009-12-22 | 321-549-1XXX | 1000–1999 | Assigned | METROPCS NETWORKS, LLC | 899D | MELBOURNE | FL |
| 2009-08-03 | 321-549-2XXX | 2000–2999 | Assigned | ONVOY, LLC - FL | 937C | MELBOURNE | FL |
| 2005-11-11 | 321-549-3XXX | 3000–3999 | Assigned | MCI WORLDCOM COMMUNICATIONS, INC. - FL | 7448 | MELBOURNE | FL |
| 2006-01-27 | 321-549-4XXX | 4000–4999 | Assigned | MCI WORLDCOM COMMUNICATIONS, INC. - FL | 7448 | MELBOURNE | FL |
| 2008-10-31 | 321-549-5XXX | 5000–5999 | Assigned | MCI WORLDCOM COMMUNICATIONS, INC. - FL | 7448 | MELBOURNE | FL |
| 2008-10-31 | 321-549-6XXX | 6000–6999 | Assigned | MCI WORLDCOM COMMUNICATIONS, INC. - FL | 7448 | MELBOURNE | FL |
| 2008-11-07 | 321-549-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - FL | 982E | MELBOURNE | FL |
| 2008-11-07 | 321-549-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - FL | 982E | MELBOURNE | FL |
| 2009-12-22 | 321-549-9XXX | 9000–9999 | Assigned | METROPCS NETWORKS, LLC | 899D | MELBOURNE | 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.