NumberResearchThousands-blocks in 740-528
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 740-528 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 740 blocks
Most active assignees, all time — NPA 740
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 |
|---|---|---|---|---|---|---|---|
| 2020-12-29 | 740-528-0XXX | 0000–0999 | Assigned | TELNYX LLC | 073H | GREEN CAMP | OH |
| 2023-04-10 | 740-528-1XXX | 1000–1999 | Assigned | ONVOY SPECTRUM, LLC | 624H | GREEN CAMP | OH |
| — | 740-528-2XXX | 2000–2999 | Reserved | FRONTIER NORTH, INC. - OH | 0615 | GREEN CAMP | OH |
| 2026-03-05 | 740-528-3XXX | 3000–3999 | Assigned | TERRA NOVA TELECOM INC. | 145J | GREEN CAMP | OH |
| 2021-02-10 | 740-528-4XXX | 4000–4999 | Assigned | ONVOY, LLC - OH | 464C | GREEN CAMP | OH |
| 2018-08-22 | 740-528-5XXX | 5000–5999 | Assigned | ONVOY, LLC - OH | 464C | GREEN CAMP | OH |
| 2007-03-26 | 740-528-6XXX | 6000–6999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | GREEN CAMP | OH |
| 2014-06-09 | 740-528-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | GREEN CAMP | OH |
| 2021-03-30 | 740-528-8XXX | 8000–8999 | Assigned | ONVOY, LLC - OH | 464C | GREEN CAMP | OH |
| — | 740-528-9XXX | 9000–9999 | Assigned (pending) | GREEN CAMP | OH |
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.