NumberResearchThousands-blocks in 631-437
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 631-437 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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2014-02-21 | 631-437-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - NY | 997E | FIREISLAND | NY |
| 2018-10-26 | 631-437-1XXX | 1000–1999 | Assigned | TELNYX LLC | 073H | FIREISLAND | NY |
| 2019-02-28 | 631-437-2XXX | 2000–2999 | Assigned | CORETEL NEW YORK, INC. - NY | 1215 | FIREISLAND | NY |
| 2016-02-23 | 631-437-3XXX | 3000–3999 | Assigned | ONVOY, LLC- NY | 384C | FIREISLAND | NY |
| 2016-02-23 | 631-437-4XXX | 4000–4999 | Assigned | ONVOY, LLC- NY | 384C | FIREISLAND | NY |
| 2020-12-30 | 631-437-5XXX | 5000–5999 | Assigned | ONVOY, LLC- NY | 384C | FIREISLAND | NY |
| 2013-10-09 | 631-437-6XXX | 6000–6999 | Assigned | TC SYSTEMS, INC. - NY | 7140 | FIREISLAND | NY |
| 2014-04-03 | 631-437-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | FIREISLAND | NY |
| 2019-04-26 | 631-437-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - NY | 997E | FIREISLAND | NY |
| 2020-12-30 | 631-437-9XXX | 9000–9999 | Assigned | ONVOY, LLC- NY | 384C | FIREISLAND | 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.