NumberResearchThousands-blocks in 661-724
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 661-724 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
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 661-724-0XXX | 0000–0999 | Reserved | FRONTIER CALIFORNIA INC. | 2319 | LAKEHUGHES | CA |
| — | 661-724-1XXX | 1000–1999 | Reserved | FRONTIER CALIFORNIA INC. | 2319 | LAKEHUGHES | CA |
| — | 661-724-2XXX | 2000–2999 | Reserved | FRONTIER CALIFORNIA INC. | 2319 | LAKEHUGHES | CA |
| 2019-02-05 | 661-724-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CA | 649C | LAKEHUGHES | CA |
| 2019-02-05 | 661-724-4XXX | 4000–4999 | Assigned | ONVOY, LLC - CA | 649C | LAKEHUGHES | CA |
| 2006-06-09 | 661-724-5XXX | 5000–5999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | LAKEHUGHES | CA |
| 2009-01-28 | 661-724-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | LAKEHUGHES | CA |
| 2018-09-24 | 661-724-7XXX | 7000–7999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | LAKEHUGHES | CA |
| 2019-03-27 | 661-724-8XXX | 8000–8999 | Assigned | ONVOY, LLC - CA | 649C | LAKEHUGHES | CA |
| — | 661-724-9XXX | 9000–9999 | Reserved | FRONTIER CALIFORNIA INC. | 2319 | LAKEHUGHES | 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.