NumberResearchThousands-blocks in 513-644
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 513-644 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 |
|---|---|---|---|---|---|---|---|
| 2011-02-14 | 513-644-0XXX | 0000–0999 | Assigned | CINCINNATI BELL | 9348 | BETHANY | OH |
| — | 513-644-1XXX | 1000–1999 | Reserved | LEVEL 3 TELECOM OF OHIO, LLC - OH | 7460 | BETHANY | OH |
| 2015-09-16 | 513-644-2XXX | 2000–2999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | BETHANY | OH |
| 2015-12-14 | 513-644-3XXX | 3000–3999 | Assigned | PEERLESS NETWORK OF OHIO, LLC - OH | 284F | BETHANY | OH |
| — | 513-644-4XXX | 4000–4999 | Reserved | LEVEL 3 TELECOM OF OHIO, LLC - OH | 7460 | BETHANY | OH |
| 2018-05-01 | 513-644-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - OH | 001F | BETHANY | OH |
| 2014-06-16 | 513-644-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | BETHANY | OH |
| — | 513-644-7XXX | 7000–7999 | Reserved | LEVEL 3 TELECOM OF OHIO, LLC - OH | 7460 | BETHANY | OH |
| — | 513-644-8XXX | 8000–8999 | Reserved | LEVEL 3 TELECOM OF OHIO, LLC - OH | 7460 | BETHANY | OH |
| 2013-06-20 | 513-644-9XXX | 9000–9999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | BETHANY | 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.