NumberResearchThousands-blocks in 510-229
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 510-229 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 510 blocks
Most active assignees, all time — NPA 510
New assignments by month
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2004-10-11 | 510-229-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD BKLY | CA |
| — | 510-229-1XXX | 1000–1999 | Reserved | PACIFIC BELL | 9740 | OKLD BKLY | CA |
| 2006-04-10 | 510-229-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD BKLY | CA |
| 2008-10-30 | 510-229-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CA | 649C | OKLD BKLY | CA |
| 2003-09-19 | 510-229-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | OKLD BKLY | CA |
| 2004-03-12 | 510-229-5XXX | 5000–5999 | Assigned | ONVOY, LLC - CA | 649C | OKLD BKLY | CA |
| 2004-03-01 | 510-229-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | OKLD BKLY | CA |
| 2005-03-23 | 510-229-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD BKLY | CA |
| 2004-12-14 | 510-229-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD BKLY | CA |
| 2005-01-21 | 510-229-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD BKLY | 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.