NumberResearchThousands-blocks in 831-315
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 831-315 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
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2017-03-02 | 831-315-0XXX | 0000–0999 | Assigned | METROPCS, INC. | 5562 | SOLEDAD | CA |
| 2016-02-16 | 831-315-1XXX | 1000–1999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | SOLEDAD | CA |
| 2017-04-17 | 831-315-2XXX | 2000–2999 | Assigned | ONVOY, LLC - CA | 649C | SOLEDAD | CA |
| 2018-05-23 | 831-315-3XXX | 3000–3999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | SOLEDAD | CA |
| 2018-06-21 | 831-315-4XXX | 4000–4999 | Assigned | TELNYX LLC | 073H | SOLEDAD | CA |
| 2018-08-15 | 831-315-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SOLEDAD | CA |
| 2016-04-15 | 831-315-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SOLEDAD | CA |
| 2018-09-24 | 831-315-7XXX | 7000–7999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | SOLEDAD | CA |
| 2018-05-11 | 831-315-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SOLEDAD | CA |
| 2018-02-12 | 831-315-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SOLEDAD | 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.