NumberResearchThousands-blocks in 831-250
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 831-250 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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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2010-05-24 | 831-250-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | CARMEL | CA |
| — | 831-250-1XXX | 1000–1999 | Reserved | IP HORIZON LLC | 515J | CARMEL | CA |
| — | 831-250-2XXX | 2000–2999 | Reserved | IP HORIZON LLC | 515J | CARMEL | CA |
| 2015-11-10 | 831-250-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CARMEL | CA |
| — | 831-250-4XXX | 4000–4999 | Reserved | IP HORIZON LLC | 515J | CARMEL | CA |
| 2013-06-03 | 831-250-5XXX | 5000–5999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | CARMEL | CA |
| 2005-06-28 | 831-250-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | CARMEL | CA |
| 2006-03-14 | 831-250-7XXX | 7000–7999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | CARMEL | CA |
| 2009-03-02 | 831-250-8XXX | 8000–8999 | Assigned | ONVOY, LLC - CA | 649C | CARMEL | CA |
| 2016-02-10 | 831-250-9XXX | 9000–9999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | CARMEL | 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.