NumberResearchThousands-blocks in 831-641
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 831-641 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 831 blocks
Most active assignees, all time — NPA 831
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 831-641-0XXX | 0000–0999 | Reserved | PACIFIC BELL | 9740 | MONTEREY | CA |
| 2023-06-26 | 831-641-1XXX | 1000–1999 | Assigned | ONVOY, LLC - CA | 649C | MONTEREY | CA |
| 2024-11-20 | 831-641-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MONTEREY | CA |
| — | 831-641-3XXX | 3000–3999 | Reserved | PACIFIC BELL | 9740 | MONTEREY | CA |
| — | 831-641-4XXX | 4000–4999 | Reserved | PACIFIC BELL | 9740 | MONTEREY | CA |
| — | 831-641-5XXX | 5000–5999 | Reserved | PACIFIC BELL | 9740 | MONTEREY | CA |
| — | 831-641-6XXX | 6000–6999 | Reserved | PACIFIC BELL | 9740 | MONTEREY | CA |
| 2017-06-23 | 831-641-7XXX | 7000–7999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | MONTEREY | CA |
| 2026-01-12 | 831-641-8XXX | 8000–8999 | Assigned | TERRA NOVA TELECOM INC. | 145J | MONTEREY | CA |
| — | 831-641-9XXX | 9000–9999 | Reserved | PACIFIC BELL | 9740 | MONTEREY | 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.