NumberResearchThousands-blocks in 831-679
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 831-679 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 |
|---|---|---|---|---|---|---|---|
| — | 831-679-0XXX | 0000–0999 | Reserved | PACIFIC BELL | 9740 | CHUALAR | CA |
| — | 831-679-1XXX | 1000–1999 | Reserved | PACIFIC BELL | 9740 | CHUALAR | CA |
| — | 831-679-2XXX | 2000–2999 | Reserved | PACIFIC BELL | 9740 | CHUALAR | CA |
| 2005-06-28 | 831-679-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | CHUALAR | CA |
| 2017-04-17 | 831-679-4XXX | 4000–4999 | Assigned | ONVOY, LLC - CA | 649C | CHUALAR | CA |
| — | 831-679-5XXX | 5000–5999 | Available | CHUALAR | CA | ||
| — | 831-679-6XXX | 6000–6999 | Available | CHUALAR | CA | ||
| 2006-06-02 | 831-679-7XXX | 7000–7999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | CHUALAR | CA |
| 2020-12-15 | 831-679-8XXX | 8000–8999 | Assigned | TERRA NOVA TELECOM INC. | 145J | CHUALAR | CA |
| 2018-06-22 | 831-679-9XXX | 9000–9999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | CHUALAR | 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.