NumberResearchThousands-blocks in 561-245
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 561-245 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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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 561-245-0XXX | 0000–0999 | Reserved | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BOCA RATON | FL |
| — | 561-245-1XXX | 1000–1999 | Reserved | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BOCA RATON | FL |
| 2008-04-07 | 561-245-2XXX | 2000–2999 | Assigned | PAETEC ITEL, LLC | 829J | BOCA RATON | FL |
| 2007-04-26 | 561-245-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | BOCA RATON | FL |
| 2006-07-03 | 561-245-4XXX | 4000–4999 | Assigned | PAETEC ITEL, LLC | 829J | BOCA RATON | FL |
| 2005-04-19 | 561-245-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | BOCA RATON | FL |
| 2005-04-19 | 561-245-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | BOCA RATON | FL |
| 2007-05-11 | 561-245-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | BOCA RATON | FL |
| 2008-02-14 | 561-245-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | BOCA RATON | FL |
| 2003-10-20 | 561-245-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL | 8664 | BOCA RATON | 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.