NumberResearchThousands-blocks in 440-370
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026
The ten 1,000-number thousand-blocks inside prefix 440-370 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 440 blocks
Most active assignees, all time — NPA 440
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 |
|---|---|---|---|---|---|---|---|
| 2014-04-16 | 440-370-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | AMHERST | OH |
| 2015-08-21 | 440-370-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | AMHERST | OH |
| 2017-03-14 | 440-370-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | AMHERST | OH |
| 2018-02-28 | 440-370-3XXX | 3000–3999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | AMHERST | OH |
| 2014-11-25 | 440-370-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH | 6025 | AMHERST | OH |
| 2015-10-13 | 440-370-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH | 6025 | AMHERST | OH |
| 2018-03-16 | 440-370-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | AMHERST | OH |
| 2013-10-23 | 440-370-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | AMHERST | OH |
| 2017-12-06 | 440-370-8XXX | 8000–8999 | Assigned | SIGECOM, LLC DBA WOW INTERNET CABLE AND PHONE | 735E | AMHERST | OH |
| 2013-06-28 | 440-370-9XXX | 9000–9999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | AMHERST | OH |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.