NumberResearchThousands-blocks in 831-613
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 831-613 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 |
|---|---|---|---|---|---|---|---|
| 2017-09-18 | 831-613-0XXX | 0000–0999 | Assigned | METROPCS, INC. | 5562 | GREENFIELD | CA |
| 2010-06-08 | 831-613-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | GREENFIELD | CA |
| 2007-06-28 | 831-613-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | GREENFIELD | CA |
| 2005-10-24 | 831-613-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | GREENFIELD | CA |
| 2008-12-01 | 831-613-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | GREENFIELD | CA |
| 2006-06-02 | 831-613-5XXX | 5000–5999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | GREENFIELD | CA |
| 2010-08-12 | 831-613-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | GREENFIELD | CA |
| 2015-09-16 | 831-613-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | GREENFIELD | CA |
| 2018-06-21 | 831-613-8XXX | 8000–8999 | Assigned | TELNYX LLC | 073H | GREENFIELD | CA |
| 2016-02-10 | 831-613-9XXX | 9000–9999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | GREENFIELD | 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.