NumberResearchThousands-blocks in 650-552
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/21/2026
The ten 1,000-number thousand-blocks inside prefix 650-552 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 650 blocks
Most active assignees, all time — NPA 650
New assignments by month
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 650-552-0XXX | 0000–0999 | Reserved | PACIFIC BELL | 9740 | MILLBRAE | CA |
| — | 650-552-1XXX | 1000–1999 | Reserved | PACIFIC BELL | 9740 | MILLBRAE | CA |
| — | 650-552-2XXX | 2000–2999 | Reserved | PACIFIC BELL | 9740 | MILLBRAE | CA |
| 2020-12-08 | 650-552-3XXX | 3000–3999 | Assigned | TERRA NOVA TELECOM INC. | 145J | MILLBRAE | CA |
| 2021-09-30 | 650-552-4XXX | 4000–4999 | Assigned | ONVOY, LLC - CA | 649C | MILLBRAE | CA |
| — | 650-552-5XXX | 5000–5999 | Reserved | PACIFIC BELL | 9740 | MILLBRAE | CA |
| 2014-12-31 | 650-552-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | MILLBRAE | CA |
| 2010-05-05 | 650-552-7XXX | 7000–7999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | MILLBRAE | CA |
| 2009-02-13 | 650-552-8XXX | 8000–8999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | MILLBRAE | CA |
| — | 650-552-9XXX | 9000–9999 | Reserved | PACIFIC BELL | 9740 | MILLBRAE | CA |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.