NumberResearchThousands-blocks in 256-987
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 256-987 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
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2021-10-18 | 256-987-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AL | 5255 | GRAYSON | AL |
| 2023-04-06 | 256-987-1XXX | 1000–1999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | GRAYSON | AL |
| — | 256-987-2XXX | 2000–2999 | Available | GRAYSON | AL | ||
| 2021-10-07 | 256-987-3XXX | 3000–3999 | Assigned | CORETEL ALABAMA, INC. - AL | 476F | GRAYSON | AL |
| — | 256-987-4XXX | 4000–4999 | Available | GRAYSON | AL | ||
| 2021-03-16 | 256-987-5XXX | 5000–5999 | Assigned | ONVOY, LLC - AL | 604E | GRAYSON | AL |
| 2021-03-16 | 256-987-6XXX | 6000–6999 | Assigned | ONVOY, LLC - AL | 604E | GRAYSON | AL |
| — | 256-987-7XXX | 7000–7999 | Available | GRAYSON | AL | ||
| 2024-11-13 | 256-987-8XXX | 8000–8999 | Assigned | ONVOY SPECTRUM, LLC | 624H | GRAYSON | AL |
| — | 256-987-9XXX | 9000–9999 | Available | GRAYSON | AL |
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.