NumberResearchThousands-blocks in 631-406
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 631-406 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 |
|---|---|---|---|---|---|---|---|
| 2021-10-29 | 631-406-0XXX | 0000–0999 | Assigned | OMNIPOINT COMMUNICATIONS, INC. - NY | 6622 | SMITHTOWN | NY |
| 2021-10-29 | 631-406-1XXX | 1000–1999 | Assigned | OMNIPOINT COMMUNICATIONS, INC. - NY | 6622 | SMITHTOWN | NY |
| 2002-08-01 | 631-406-2XXX | 2000–2999 | Assigned | TC SYSTEMS, INC. - NY | 7140 | SMITHTOWN | NY |
| 2008-03-24 | 631-406-3XXX | 3000–3999 | Assigned | OMNIPOINT COMMUNICATIONS, INC. - NY | 6622 | SMITHTOWN | NY |
| 2005-10-20 | 631-406-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | SMITHTOWN | NY |
| 2005-10-20 | 631-406-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | SMITHTOWN | NY |
| 2007-09-17 | 631-406-6XXX | 6000–6999 | Assigned | CSC VOICE, LLC | 612K | SMITHTOWN | NY |
| 2007-09-17 | 631-406-7XXX | 7000–7999 | Assigned | CSC VOICE, LLC | 612K | SMITHTOWN | NY |
| — | 631-406-8XXX | 8000–8999 | Reserved | RCN TELECOM SERVICES, INC. - NY | 7353 | SMITHTOWN | NY |
| 2010-05-24 | 631-406-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - NY | 997E | SMITHTOWN | 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.