NumberResearchThousands-blocks in 740-255
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 740-255 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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 740-255-0XXX | 0000–0999 | Reserved | METROPCS, INC. | 5562 | CAMBRIDGE | OH |
| 2006-12-29 | 740-255-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH | 6025 | CAMBRIDGE | OH |
| 2007-10-04 | 740-255-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH | 6025 | CAMBRIDGE | OH |
| 2007-10-04 | 740-255-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH | 6025 | CAMBRIDGE | OH |
| 2008-11-17 | 740-255-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH | 6025 | CAMBRIDGE | OH |
| 2007-02-12 | 740-255-5XXX | 5000–5999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | CAMBRIDGE | OH |
| — | 740-255-6XXX | 6000–6999 | Reserved | AERIAL COMMUNICATIONS, INC. | 6701 | CAMBRIDGE | OH |
| — | 740-255-7XXX | 7000–7999 | Reserved | AERIAL COMMUNICATIONS, INC. | 6701 | CAMBRIDGE | OH |
| 2020-12-28 | 740-255-8XXX | 8000–8999 | Assigned | TELNYX LLC | 073H | CAMBRIDGE | OH |
| 2022-10-13 | 740-255-9XXX | 9000–9999 | Assigned | ONVOY SPECTRUM, LLC | 624H | CAMBRIDGE | OH |
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.