NumberResearchThousands-blocks in 530-628
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 530-628 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 530 blocks
Most active assignees, all time — NPA 530
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2010-02-01 | 530-628-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | HAYFORK | CA |
| — | 530-628-1XXX | 1000–1999 | Reserved | FRONTIER CALIFORNIA INC. | 4420 | HAYFORK | CA |
| 2016-02-10 | 530-628-2XXX | 2000–2999 | Assigned | ONVOY, LLC - CA | 649C | HAYFORK | CA |
| 2009-01-26 | 530-628-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | HAYFORK | CA |
| — | 530-628-4XXX | 4000–4999 | Reserved | FRONTIER CALIFORNIA INC. | 4420 | HAYFORK | CA |
| — | 530-628-5XXX | 5000–5999 | Reserved | FRONTIER CALIFORNIA INC. | 4420 | HAYFORK | CA |
| 2005-07-06 | 530-628-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | HAYFORK | CA |
| 2011-06-07 | 530-628-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | HAYFORK | CA |
| 2006-08-28 | 530-628-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | HAYFORK | CA |
| 2017-04-13 | 530-628-9XXX | 9000–9999 | Assigned | ONVOY, LLC - CA | 649C | HAYFORK | 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.