NumberResearchThousands-blocks in 561-820
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 561-820 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 |
|---|---|---|---|---|---|---|---|
| — | 561-820-0XXX | 0000–0999 | Reserved | BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL | 9417 | WPALMBEACH | FL |
| — | 561-820-1XXX | 1000–1999 | Reserved | BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL | 9417 | WPALMBEACH | FL |
| — | 561-820-2XXX | 2000–2999 | Reserved | BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL | 9417 | WPALMBEACH | FL |
| — | 561-820-3XXX | 3000–3999 | Reserved | BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL | 9417 | WPALMBEACH | FL |
| — | 561-820-4XXX | 4000–4999 | Reserved | BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL | 9417 | WPALMBEACH | FL |
| 2024-04-09 | 561-820-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - FL | 6502 | WPALMBEACH | FL |
| 2024-04-09 | 561-820-6XXX | 6000–6999 | Assigned | ONVOY, LLC - FL | 937C | WPALMBEACH | FL |
| 2020-07-21 | 561-820-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - FL | 6502 | WPALMBEACH | FL |
| — | 561-820-8XXX | 8000–8999 | Reserved | BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL | 9417 | WPALMBEACH | FL |
| — | 561-820-9XXX | 9000–9999 | Reserved | BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL | 9417 | WPALMBEACH | 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.