NumberResearchThousands-blocks in 513-278
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 513-278 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 513 blocks
Most active assignees, all time — NPA 513
New assignments by month
Sep 2026
Aug 2026
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Dec 2025
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2024-08-14 | 513-278-0XXX | 0000–0999 | Assigned | TERRA NOVA TELECOM INC. | 145J | BETHEL | OH |
| — | 513-278-1XXX | 1000–1999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - OH | 4863 | BETHEL | OH |
| 2008-04-16 | 513-278-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - OH | 4863 | BETHEL | OH |
| 2010-02-01 | 513-278-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - OH | 001F | BETHEL | OH |
| 2023-02-08 | 513-278-4XXX | 4000–4999 | Assigned | ONVOY, LLC - OH | 464C | BETHEL | OH |
| 2022-09-07 | 513-278-5XXX | 5000–5999 | Assigned | ONVOY, LLC - OH | 464C | BETHEL | OH |
| 2021-06-27 | 513-278-6XXX | 6000–6999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | BETHEL | OH |
| 2009-01-12 | 513-278-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - OH | 001F | BETHEL | OH |
| 2010-12-09 | 513-278-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - OH | 001F | BETHEL | OH |
| 2021-11-09 | 513-278-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - OH | 001F | BETHEL | 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.