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 413
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2020-09-09 | 413-389-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | SPRINGFLD | MA |
| 2014-09-16 | 413-998-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | SOUTHWICK | MA |
| 2013-04-10 | 413-672-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | NORTHADAMS | MA |
| 2009-02-20 | 413-486-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | ELONGMEDOW | MA |
| 2007-02-07 | 413-203-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | EASTHAMPTN | MA |
| 2007-02-07 | 413-277-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | WARE | MA |
| 2007-02-07 | 413-961-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | WORTHINGTN | MA |
| 2006-03-15 | 413-591-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | GREATBNGTN | MA |
| 2006-03-09 | 413-200-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | CUMMINGTON | MA |
| 2006-03-09 | 413-242-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | PITTSFIELD | MA |
| 2006-03-09 | 413-370-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | PALMER | MA |
| 2006-03-09 | 413-387-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | NORTHAMPTN | MA |
| 2006-03-09 | 413-475-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | GREENFIELD | MA |
| 2006-03-09 | 413-497-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | GILBERTVL | MA |
| 2006-03-09 | 413-548-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | AMHRSTFKLN | MA |
| 2006-03-09 | 413-551-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | LENOX | MA |
| 2006-03-09 | 413-561-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | HOLYOKE | MA |
| 2006-03-09 | 413-749-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | ADAMS | MA |
| 2006-03-09 | 413-848-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | BLANDFORD | MA |
| 2006-03-06 | 413-654-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | SPRINGFLD | MA |
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.