NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026
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 916
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2020-11-25 | 916-902-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | SCRM MAIN | CA |
| 2009-07-01 | 916-374-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | SCRM MAIN | CA |
| 2009-03-02 | 916-889-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | SCRM MAIN | CA |
| 2009-01-07 | 916-865-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | RSVL MAIN | CA |
| 2008-06-20 | 916-469-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | SCRM MAIN | CA |
| 2007-03-12 | 916-751-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | RSVL MAIN | CA |
| 2003-10-16 | 916-218-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | RSVL MAIN | CA |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.