NumberResearchThousands-blocks in 415-691
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 415-691 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 415 blocks
Most active assignees, all time — NPA 415
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2010-05-13 | 415-691-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | BELVEDERE | CA |
| 2010-09-01 | 415-691-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | BELVEDERE | CA |
| 2012-12-17 | 415-691-2XXX | 2000–2999 | Assigned | ONVOY, LLC - CA | 649C | BELVEDERE | CA |
| — | 415-691-3XXX | 3000–3999 | Reserved | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | BELVEDERE | CA |
| 2003-12-23 | 415-691-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | BELVEDERE | CA |
| 2009-11-24 | 415-691-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | BELVEDERE | CA |
| 2005-02-01 | 415-691-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | BELVEDERE | CA |
| 2010-01-28 | 415-691-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | BELVEDERE | CA |
| 2009-11-18 | 415-691-8XXX | 8000–8999 | Assigned | ONVOY, LLC - CA | 649C | BELVEDERE | CA |
| 2010-08-04 | 415-691-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | BELVEDERE | 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.