NumberResearchThousands-blocks in 256-568
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 256-568 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 256 blocks
Most active assignees, all time — NPA 256
New assignments by month
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2011-12-12 | 256-568-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - AL | 072F | RANBURNE | AL |
| 2019-01-08 | 256-568-1XXX | 1000–1999 | Assigned | ONVOY, LLC - AL | 604E | RANBURNE | AL |
| — | 256-568-2XXX | 2000–2999 | Reserved | BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL | 9417 | RANBURNE | AL |
| — | 256-568-3XXX | 3000–3999 | Reserved | BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL | 9417 | RANBURNE | AL |
| 2011-01-24 | 256-568-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | RANBURNE | AL |
| 2022-04-08 | 256-568-5XXX | 5000–5999 | Assigned | TERRA NOVA TELECOM INC. | 145J | RANBURNE | AL |
| 2014-07-10 | 256-568-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - AL | 072F | RANBURNE | AL |
| — | 256-568-7XXX | 7000–7999 | Reserved | BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL | 9417 | RANBURNE | AL |
| 2015-04-13 | 256-568-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - AL | 072F | RANBURNE | AL |
| 2022-11-17 | 256-568-9XXX | 9000–9999 | Assigned | TERRA NOVA TELECOM INC. | 145J | RANBURNE | AL |
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.