NumberResearchThousands-blocks in 956-424
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 956-424 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 956 blocks
Most active assignees, all time — NPA 956
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 956-424-0XXX | 0000–0999 | Reserved | SOUTHWESTERN BELL | 9533 | MISSION | TX |
| — | 956-424-1XXX | 1000–1999 | Reserved | SOUTHWESTERN BELL | 9533 | MISSION | TX |
| 2004-10-13 | 956-424-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | MISSION | TX |
| — | 956-424-3XXX | 3000–3999 | Reserved | SOUTHWESTERN BELL | 9533 | MISSION | TX |
| 2005-09-21 | 956-424-4XXX | 4000–4999 | Assigned | FOREMOST TELECOMMUNICATIONS CORPORATION - TX | 319D | MISSION | TX |
| 2004-10-13 | 956-424-5XXX | 5000–5999 | Assigned | STPCS JOINT VENTURE, LLC | 4290 | MISSION | TX |
| 2004-09-07 | 956-424-6XXX | 6000–6999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | MISSION | TX |
| — | 956-424-7XXX | 7000–7999 | Reserved | SOUTHWESTERN BELL | 9533 | MISSION | TX |
| 2020-12-15 | 956-424-8XXX | 8000–8999 | Assigned | STPCS JOINT VENTURE, LLC | 4290 | MISSION | TX |
| — | 956-424-9XXX | 9000–9999 | Reserved | SOUTHWESTERN BELL | 9533 | MISSION | TX |
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.