NumberResearchThousands-blocks in 530-278
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 530-278 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
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2013-04-03 | 530-278-0XXX | 0000–0999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | GRVY SOUTH | CA |
| 2003-09-18 | 530-278-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | GRVY SOUTH | CA |
| 2003-09-18 | 530-278-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | GRVY SOUTH | CA |
| 2007-01-18 | 530-278-3XXX | 3000–3999 | Assigned | CSC VOICE, LLC | 612K | GRVY SOUTH | CA |
| 2003-10-09 | 530-278-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | GRVY SOUTH | CA |
| 2010-02-01 | 530-278-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | GRVY SOUTH | CA |
| 2010-06-21 | 530-278-6XXX | 6000–6999 | Assigned | ONVOY, LLC - CA | 649C | GRVY SOUTH | CA |
| 2005-03-31 | 530-278-7XXX | 7000–7999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | GRVY SOUTH | CA |
| 2011-05-26 | 530-278-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | GRVY SOUTH | CA |
| — | 530-278-9XXX | 9000–9999 | Reserved | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | GRVY SOUTH | 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.