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 408
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2021-04-05 | 408-805-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | SARATOGA | CA |
| 2021-03-30 | 408-333-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | SNJS SOUTH | CA |
| 2016-08-18 | 408-878-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | SNJS WEST | CA |
| 2016-08-15 | 408-721-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | SUNNYVALE | CA |
| 2016-08-15 | 408-897-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | SANANTONIO | CA |
| 2013-04-19 | 408-797-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | SNJS NORTH | CA |
| 2010-12-02 | 408-385-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | CAMPBELL | CA |
| 2010-02-18 | 408-462-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | SUNNYVALE | CA |
| 2010-02-18 | 408-520-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | SNJS NORTH | CA |
| 2010-02-18 | 408-599-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | SNJS SOUTH | CA |
| 2010-02-18 | 408-963-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | CAMPBELL | CA |
| 2006-08-28 | 408-722-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | MORGANHILL | CA |
| 2006-08-28 | 408-827-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | LOS GATOS | CA |
| 2003-09-19 | 408-429-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | CAMPBELL | CA |
| 2003-09-19 | 408-429-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | CAMPBELL | CA |
| 2003-09-19 | 408-582-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | SNJS NORTH | CA |
| 2003-09-19 | 408-582-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | SNJS NORTH | CA |
| 2002-09-17 | 408-470-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | SUNNYVALE | CA |
| 2002-09-17 | 408-470-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | SUNNYVALE | 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.