NumberResearchThousands-blocks in 631-387
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 631-387 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 631 blocks
Most active assignees, all time — NPA 631
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 631-387-0XXX | 0000–0999 | Reserved | TC SYSTEMS, INC. - NY | 7140 | COMMACK | NY |
| 2003-08-28 | 631-387-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | COMMACK | NY |
| 2003-08-28 | 631-387-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | COMMACK | NY |
| 2004-06-16 | 631-387-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | COMMACK | NY |
| 2012-12-18 | 631-387-4XXX | 4000–4999 | Assigned | ONVOY, LLC- NY | 384C | COMMACK | NY |
| 2004-09-17 | 631-387-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | COMMACK | NY |
| 2004-11-29 | 631-387-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | COMMACK | NY |
| 2022-04-05 | 631-387-7XXX | 7000–7999 | Assigned | TERRA NOVA TELECOM INC. | 145J | COMMACK | NY |
| — | 631-387-8XXX | 8000–8999 | Assigned (pending) | COMMACK | NY | ||
| 2026-02-19 | 631-387-9XXX | 9000–9999 | Assigned | ONVOY, LLC- NY | 384C | COMMACK | NY |
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.