NumberResearchThousands-blocks in 951-597
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 951-597 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 951 blocks
Most active assignees, all time — NPA 951
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2022-09-01 | 951-597-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | CORONA | CA |
| 2022-05-31 | 951-597-1XXX | 1000–1999 | Assigned | BARR TELL USA, LLC | 026K | CORONA | CA |
| 2022-08-26 | 951-597-2XXX | 2000–2999 | Assigned | ONVOY, LLC - CA | 649C | CORONA | CA |
| 2022-09-01 | 951-597-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | CORONA | CA |
| 2021-12-16 | 951-597-4XXX | 4000–4999 | Assigned | ONVOY SPECTRUM, LLC | 624H | CORONA | CA |
| 2021-12-16 | 951-597-5XXX | 5000–5999 | Assigned | ONVOY SPECTRUM, LLC | 624H | CORONA | CA |
| 2021-12-16 | 951-597-6XXX | 6000–6999 | Assigned | ONVOY SPECTRUM, LLC | 624H | CORONA | CA |
| 2021-12-16 | 951-597-7XXX | 7000–7999 | Assigned | ONVOY SPECTRUM, LLC | 624H | CORONA | CA |
| 2021-11-09 | 951-597-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | CORONA | CA |
| 2021-11-09 | 951-597-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | CORONA | CA |
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.