NumberResearchThousands-blocks in 424-440
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 424-440 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 424 blocks
Most active assignees, all time — NPA 424
New assignments by month
Sep 2026
Aug 2026
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Jun 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2020-01-20 | 424-440-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | W ANGELES | CA |
| 2020-05-15 | 424-440-1XXX | 1000–1999 | Assigned | AIRESPRING, INC. | 996H | W ANGELES | CA |
| 2020-05-15 | 424-440-2XXX | 2000–2999 | Assigned | VONAGE AMERICA LLC | 197D | W ANGELES | CA |
| 2019-08-15 | 424-440-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | W ANGELES | CA |
| 2019-07-29 | 424-440-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | W ANGELES | CA |
| 2019-07-29 | 424-440-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | W ANGELES | CA |
| 2019-07-05 | 424-440-6XXX | 6000–6999 | Assigned | METROPCS NETWORKS, LLC | 899D | W ANGELES | CA |
| 2019-07-05 | 424-440-7XXX | 7000–7999 | Assigned | METROPCS NETWORKS, LLC | 899D | W ANGELES | CA |
| 2020-02-27 | 424-440-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | W ANGELES | CA |
| 2019-06-18 | 424-440-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | W ANGELES | CA |
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.