NumberResearchThousands-blocks in 631-378
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 631-378 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
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2005-02-08 | 631-378-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | SHOREHAM | NY |
| 2012-01-31 | 631-378-1XXX | 1000–1999 | Assigned | TELENGY L.L.C. - NY | 473G | SHOREHAM | NY |
| 2019-03-20 | 631-378-2XXX | 2000–2999 | Assigned | CORETEL NEW YORK, INC. - NY | 1215 | SHOREHAM | NY |
| 2012-03-12 | 631-378-3XXX | 3000–3999 | Assigned | ONVOY, LLC- NY | 384C | SHOREHAM | NY |
| — | 631-378-4XXX | 4000–4999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | SHOREHAM | NY |
| 2005-10-20 | 631-378-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | SHOREHAM | NY |
| 2018-02-15 | 631-378-6XXX | 6000–6999 | Assigned | TC SYSTEMS, INC. - NY | 7140 | SHOREHAM | NY |
| 2014-04-08 | 631-378-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | SHOREHAM | NY |
| 2016-02-11 | 631-378-8XXX | 8000–8999 | Assigned | ONVOY, LLC- NY | 384C | SHOREHAM | NY |
| 2016-02-11 | 631-378-9XXX | 9000–9999 | Assigned | ONVOY, LLC- NY | 384C | SHOREHAM | 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.