NumberResearchThousands-blocks in 510-495
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 510-495 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
Sep 2026
Aug 2026
Jul 2026
Jun 2026
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Dec 2025
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2010-09-30 | 510-495-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | OKLD BKLY | CA |
| 2007-04-02 | 510-495-1XXX | 1000–1999 | Assigned | ONVOY, LLC - CA | 649C | OKLD BKLY | CA |
| — | 510-495-2XXX | 2000–2999 | Reserved | PACIFIC BELL | 9740 | OKLD BKLY | CA |
| — | 510-495-3XXX | 3000–3999 | Reserved | PACIFIC BELL | 9740 | OKLD BKLY | CA |
| 2004-08-13 | 510-495-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | OKLD BKLY | CA |
| 2004-08-13 | 510-495-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | OKLD BKLY | CA |
| 2005-02-24 | 510-495-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | OKLD BKLY | CA |
| 2005-12-27 | 510-495-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD BKLY | CA |
| — | 510-495-8XXX | 8000–8999 | Reserved | PACIFIC BELL | 9740 | OKLD BKLY | CA |
| 2012-06-12 | 510-495-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | 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.