NumberResearchThousands-blocks in 631-259
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 631-259 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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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 631-259-0XXX | 0000–0999 | Reserved | VERIZON NEW YORK, INC. | 9104 | SOUTHAMPTN | NY |
| 2008-11-13 | 631-259-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | SOUTHAMPTN | NY |
| 2004-10-29 | 631-259-2XXX | 2000–2999 | Assigned | CSC VOICE, LLC | 612K | SOUTHAMPTN | NY |
| 2001-08-28 | 631-259-3XXX | 3000–3999 | Assigned | CSC VOICE, LLC | 612K | SOUTHAMPTN | NY |
| 2004-03-15 | 631-259-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | SOUTHAMPTN | NY |
| 2006-10-11 | 631-259-5XXX | 5000–5999 | Assigned | PAETEC ITEL, LLC | 829J | SOUTHAMPTN | NY |
| 2005-11-16 | 631-259-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | SOUTHAMPTN | NY |
| 2006-03-02 | 631-259-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | SOUTHAMPTN | NY |
| — | 631-259-8XXX | 8000–8999 | Reserved | VERIZON NEW YORK, INC. | 9104 | SOUTHAMPTN | NY |
| 2022-04-07 | 631-259-9XXX | 9000–9999 | Assigned | TERRA NOVA TELECOM INC. | 145J | SOUTHAMPTN | 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.