NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026
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 339
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2021-11-04 | 339-228-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | LYNN | MA |
| 2021-11-04 | 339-329-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | MARBLEHEAD | MA |
| 2021-11-04 | 339-565-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | LINCOLN | MA |
| 2017-06-12 | 339-777-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | NEEDHAM | MA |
| 2016-06-01 | 339-210-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | SAUGUS | MA |
| 2016-06-01 | 339-215-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | LEXINGTON | MA |
| 2016-06-01 | 339-216-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | RANDOLPH | MA |
| 2015-09-28 | 339-333-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | LINCOLN | MA |
| 2015-09-22 | 339-900-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | MARSHFIELD | MA |
| 2015-09-16 | 339-777-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | NEEDHAM | MA |
| 2015-02-25 | 339-707-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | ARLINGTON | MA |
| 2015-02-20 | 339-777-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | NEEDHAM | MA |
| 2013-08-02 | 339-205-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | WEYMOUTH | MA |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.