NumberResearchThousands-blocks in 424-428
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 424-428 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
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 |
|---|---|---|---|---|---|---|---|
| 2019-04-04 | 424-428-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SNMN MRVS | CA |
| 2021-07-09 | 424-428-1XXX | 1000–1999 | Assigned | ONVOY, LLC - CA | 649C | SNMN MRVS | CA |
| 2021-06-23 | 424-428-2XXX | 2000–2999 | Assigned | ONVOY SPECTRUM, LLC | 624H | SNMN MRVS | CA |
| 2021-04-01 | 424-428-3XXX | 3000–3999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7139 | SNMN MRVS | CA |
| 2019-09-25 | 424-428-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | SNMN MRVS | CA |
| 2020-06-01 | 424-428-5XXX | 5000–5999 | Assigned | VONAGE AMERICA LLC | 197D | SNMN MRVS | CA |
| 2020-02-27 | 424-428-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SNMN MRVS | CA |
| 2020-05-22 | 424-428-7XXX | 7000–7999 | Assigned | METROPCS NETWORKS, LLC | 899D | SNMN MRVS | CA |
| 2020-06-01 | 424-428-8XXX | 8000–8999 | Assigned | VONAGE AMERICA LLC | 197D | SNMN MRVS | CA |
| 2019-05-24 | 424-428-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | SNMN MRVS | 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.