NumberResearchThousands-blocks in 661-843
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 661-843 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
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2021-03-30 | 661-843-0XXX | 0000–0999 | Assigned | ONVOY, LLC - CA | 649C | BKFD MAIN | CA |
| — | 661-843-1XXX | 1000–1999 | Reserved | ONVOY, LLC - CA | 649C | BKFD MAIN | CA |
| — | 661-843-2XXX | 2000–2999 | Reserved | ONVOY, LLC - CA | 649C | BKFD MAIN | CA |
| — | 661-843-3XXX | 3000–3999 | Reserved | UTILITY TELECOM GROUP, LLC - CA | 9262 | BKFD MAIN | CA |
| 2021-12-09 | 661-843-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| — | 661-843-5XXX | 5000–5999 | Reserved | ONVOY, LLC - CA | 649C | BKFD MAIN | CA |
| — | 661-843-6XXX | 6000–6999 | Reserved | BANDWIDTH.COM CLEC, LLC - CA | 981E | BKFD MAIN | CA |
| 2011-06-29 | 661-843-7XXX | 7000–7999 | Assigned | BHN IP ENABLED SERVICES, LLC | 045L | BKFD MAIN | CA |
| 2012-04-27 | 661-843-8XXX | 8000–8999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | BKFD MAIN | CA |
| — | 661-843-9XXX | 9000–9999 | Reserved | UTILITY TELECOM GROUP, LLC - CA | 9262 | BKFD MAIN | CA |
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.