NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026
Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.
Most active assignees, all time — NPA 310
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2006-08-08 | 310-448-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | SNMN MRVS | CA |
| 2006-08-08 | 310-448-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | SNMN MRVS | CA |
| 2005-01-11 | 310-589-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | MALIBU | CA |
| 2005-01-11 | 310-589-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | MALIBU | CA |
| 2005-01-11 | 310-683-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | REDONDO | CA |
| 2005-01-11 | 310-907-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | SNMN SNMN | CA |
| 2005-01-11 | 310-923-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | W ANGELES | CA |
| 2005-01-11 | 310-923-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | W ANGELES | CA |
| 2003-09-19 | 310-747-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | CMTN CMTN | CA |
| 2003-09-19 | 310-818-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | CMTN GRDN | CA |
| 2003-09-19 | 310-974-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | TORRANCE | CA |
| 2002-09-17 | 310-872-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | SAN PEDRO | CA |
| 2002-09-17 | 310-872-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | SAN PEDRO | 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.