NumberResearchThousands-blocks in 870-766
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 870-766 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 870 blocks
Most active assignees, all time — NPA 870
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 870-766-0XXX | 0000–0999 | Available | ALTHEIMER | AR | ||
| — | 870-766-1XXX | 1000–1999 | Reserved | SOUTHWESTERN BELL | 9533 | ALTHEIMER | AR |
| 2022-12-20 | 870-766-2XXX | 2000–2999 | Assigned | E. RITTER COMMUNICATIONS, LLC | 128L | ALTHEIMER | AR |
| 2011-03-01 | 870-766-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ALTHEIMER | AR |
| — | 870-766-4XXX | 4000–4999 | Reserved | SOUTHWESTERN BELL | 9533 | ALTHEIMER | AR |
| — | 870-766-5XXX | 5000–5999 | Available | ALTHEIMER | AR | ||
| 2021-06-09 | 870-766-6XXX | 6000–6999 | Assigned | ONVOY, LLC - AR | 348F | ALTHEIMER | AR |
| 2015-03-18 | 870-766-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AR | 5179 | ALTHEIMER | AR |
| — | 870-766-8XXX | 8000–8999 | Reserved | SOUTHWESTERN BELL | 9533 | ALTHEIMER | AR |
| — | 870-766-9XXX | 9000–9999 | Reserved | SOUTHWESTERN BELL | 9533 | ALTHEIMER | AR |
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.