NumberResearchThousands-blocks in 561-671
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 561-671 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 561 blocks
Most active assignees, all time — NPA 561
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2018-07-18 | 561-671-0XXX | 0000–0999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | WPALMBEACH | FL |
| — | 561-671-1XXX | 1000–1999 | Reserved | BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL | 9417 | WPALMBEACH | FL |
| — | 561-671-2XXX | 2000–2999 | Reserved | BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL | 9417 | WPALMBEACH | FL |
| — | 561-671-3XXX | 3000–3999 | Reserved | BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL | 9417 | WPALMBEACH | FL |
| — | 561-671-4XXX | 4000–4999 | Reserved | BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL | 9417 | WPALMBEACH | FL |
| — | 561-671-5XXX | 5000–5999 | Reserved | BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL | 9417 | WPALMBEACH | FL |
| — | 561-671-6XXX | 6000–6999 | Reserved | BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL | 9417 | WPALMBEACH | FL |
| — | 561-671-7XXX | 7000–7999 | Reserved | BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL | 9417 | WPALMBEACH | FL |
| 2018-07-18 | 561-671-8XXX | 8000–8999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | WPALMBEACH | FL |
| 2011-01-06 | 561-671-9XXX | 9000–9999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | WPALMBEACH | FL |
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.