NumberResearchThousands-blocks in 870-644
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/21/2026
The ten 1,000-number thousand-blocks inside prefix 870-644 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 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 |
|---|---|---|---|---|---|---|---|
| — | 870-644-0XXX | 0000–0999 | Reserved | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | WATSON | AR |
| — | 870-644-1XXX | 1000–1999 | Reserved | SOUTHWESTERN BELL | 9533 | WATSON | AR |
| 2011-03-01 | 870-644-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | WATSON | AR |
| — | 870-644-3XXX | 3000–3999 | Reserved | SOUTHWESTERN BELL | 9533 | WATSON | AR |
| 2021-06-11 | 870-644-4XXX | 4000–4999 | Assigned | ONVOY, LLC - AR | 348F | WATSON | AR |
| 2024-06-03 | 870-644-5XXX | 5000–5999 | Assigned | ONVOY SPECTRUM, LLC | 624H | WATSON | AR |
| 2019-06-07 | 870-644-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | WATSON | AR |
| 2015-03-20 | 870-644-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | WATSON | AR |
| — | 870-644-8XXX | 8000–8999 | Available | WATSON | AR | ||
| — | 870-644-9XXX | 9000–9999 | Available | WATSON | AR |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.