NumberResearchThousands-blocks in 424-287
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 424-287 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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2013-03-14 | 424-287-0XXX | 0000–0999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | SAN PEDRO | CA |
| 2013-04-03 | 424-287-1XXX | 1000–1999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | SAN PEDRO | CA |
| 2013-10-01 | 424-287-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SAN PEDRO | CA |
| 2013-04-03 | 424-287-3XXX | 3000–3999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | SAN PEDRO | CA |
| 2012-12-19 | 424-287-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SAN PEDRO | CA |
| 2013-02-27 | 424-287-5XXX | 5000–5999 | Assigned | ONVOY, LLC - CA | 649C | SAN PEDRO | CA |
| 2013-02-11 | 424-287-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | SAN PEDRO | CA |
| 2014-02-25 | 424-287-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SAN PEDRO | CA |
| 2012-12-14 | 424-287-8XXX | 8000–8999 | Assigned | METROPCS NETWORKS, LLC | 899D | SAN PEDRO | CA |
| 2013-10-11 | 424-287-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | SAN PEDRO | 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.