NumberResearchThousands-blocks in 661-454
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 661-454 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 661 blocks
Most active assignees, all time — NPA 661
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2017-12-08 | 661-454-0XXX | 0000–0999 | Assigned | ONVOY, LLC - CA | 649C | DELANO | CA |
| — | 661-454-1XXX | 1000–1999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | DELANO | CA |
| 2018-03-28 | 661-454-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | DELANO | CA |
| 2007-08-08 | 661-454-3XXX | 3000–3999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | DELANO | CA |
| 2018-10-11 | 661-454-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | DELANO | CA |
| 2005-07-05 | 661-454-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | DELANO | CA |
| 2013-08-05 | 661-454-6XXX | 6000–6999 | Assigned | BHN IP ENABLED SERVICES, LLC | 045L | DELANO | CA |
| 2011-05-27 | 661-454-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | DELANO | CA |
| 2010-01-19 | 661-454-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | DELANO | CA |
| 2007-11-09 | 661-454-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | DELANO | CA |
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.