NumberResearchThousands-blocks in 707-503
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 707-503 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 707 blocks
Most active assignees, all time — NPA 707
New assignments by month
Sep 2026
Aug 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2018-09-04 | 707-503-0XXX | 0000–0999 | Assigned | ONVOY, LLC - CA | 649C | SEBASTOPOL | CA |
| 2018-09-07 | 707-503-1XXX | 1000–1999 | Assigned | TELNYX LLC | 073H | SEBASTOPOL | CA |
| 2018-10-18 | 707-503-2XXX | 2000–2999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | SEBASTOPOL | CA |
| 2018-11-30 | 707-503-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CA | 649C | SEBASTOPOL | CA |
| 2021-04-07 | 707-503-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | SEBASTOPOL | CA |
| 2024-12-20 | 707-503-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SEBASTOPOL | CA |
| 2019-04-11 | 707-503-6XXX | 6000–6999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | SEBASTOPOL | CA |
| 2021-06-29 | 707-503-7XXX | 7000–7999 | Assigned | ONVOY, LLC - CA | 649C | SEBASTOPOL | CA |
| 2020-11-23 | 707-503-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SEBASTOPOL | CA |
| 2018-11-07 | 707-503-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SEBASTOPOL | 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.