NumberResearchThousands-blocks in 256-660
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 256-660 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 |
|---|---|---|---|---|---|---|---|
| 2007-09-21 | 256-660-0XXX | 0000–0999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | ALBERTVL | AL |
| 2008-08-06 | 256-660-1XXX | 1000–1999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | ALBERTVL | AL |
| 2012-04-30 | 256-660-2XXX | 2000–2999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | ALBERTVL | AL |
| 2006-11-15 | 256-660-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AL | 7469 | ALBERTVL | AL |
| 2005-08-01 | 256-660-4XXX | 4000–4999 | Assigned | AT&T - LOCAL | 7421 | ALBERTVL | AL |
| 2013-02-28 | 256-660-5XXX | 5000–5999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | ALBERTVL | AL |
| 2015-10-02 | 256-660-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - AL | 072F | ALBERTVL | AL |
| 2014-02-26 | 256-660-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | ALBERTVL | AL |
| 2017-02-01 | 256-660-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | ALBERTVL | AL |
| 2004-09-07 | 256-660-9XXX | 9000–9999 | Assigned | POWERTEL BIRMINGHAM LICENSES, INC. | 7475 | ALBERTVL | 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.