NumberResearchThousands-blocks in 661-413
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 661-413 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
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 661-413-0XXX | 0000–0999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | CUYAMA | CA |
| 2006-08-31 | 661-413-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | CUYAMA | CA |
| 2006-08-31 | 661-413-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | CUYAMA | CA |
| 2010-07-30 | 661-413-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | CUYAMA | CA |
| 2021-06-25 | 661-413-4XXX | 4000–4999 | Assigned | ONVOY, LLC - CA | 649C | CUYAMA | CA |
| 2014-10-10 | 661-413-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | CUYAMA | CA |
| 2015-08-25 | 661-413-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | CUYAMA | CA |
| 2021-11-16 | 661-413-7XXX | 7000–7999 | Assigned | TELNYX LLC | 073H | CUYAMA | CA |
| 2018-06-27 | 661-413-8XXX | 8000–8999 | Assigned | TELNYX LLC | 073H | CUYAMA | CA |
| 2016-02-11 | 661-413-9XXX | 9000–9999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | CUYAMA | 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.