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 657
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2016-02-04 | 657-288-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | WESTMINSTR | CA |
| 2015-10-14 | 657-291-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | ORANGE | CA |
| 2015-10-07 | 657-275-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | PLACENTIA | CA |
| 2015-09-11 | 657-259-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | HUNTITNBCH | CA |
| 2015-08-21 | 657-271-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | WESTMINSTR | CA |
| 2015-08-21 | 657-363-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | YORBALINDA | CA |
| 2015-06-11 | 657-266-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | SANTA ANA | 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.