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 951
New assignments by month
Sep 2026
Aug 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2015-08-26 | 951-420-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | PERRIS | CA |
| 2015-08-26 | 951-458-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | SUN CITY | CA |
| 2015-08-21 | 951-262-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | HEMT ANZA | CA |
| 2015-08-21 | 951-381-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | BANNING | CA |
| 2015-08-21 | 951-388-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | HEMT HMLD | CA |
| 2015-08-21 | 951-399-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | ELSINORE | CA |
| 2015-08-21 | 951-426-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | HEMT SNJC | CA |
| 2015-08-21 | 951-438-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | HEMT HEMT | CA |
| 2015-08-21 | 951-447-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | MURRIETA | CA |
| 2015-08-21 | 951-527-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | IDYLLWILD | CA |
| 2006-08-16 | 951-327-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | HEMT SNJC | CA |
| 2006-08-16 | 951-708-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | HEMT SAGE | CA |
| 2006-08-15 | 951-389-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | HEMT ANZA | CA |
| 2006-08-15 | 951-389-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | HEMT ANZA | CA |
| 2006-08-15 | 951-473-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | MURRIETA | CA |
| 2006-08-15 | 951-473-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | MURRIETA | CA |
| 2006-08-15 | 951-575-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | PERRIS | CA |
| 2006-08-15 | 951-575-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | PERRIS | CA |
| 2006-08-15 | 951-599-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | HEMT HMLD | CA |
| 2006-08-15 | 951-599-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | HEMT HMLD | CA |
| 2006-08-15 | 951-878-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | LAKEVIEWNU | CA |
| 2006-08-15 | 951-878-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | LAKEVIEWNU | CA |
| 2006-08-15 | 951-934-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | MIRA LOMA | CA |
| 2006-08-15 | 951-934-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | MIRA LOMA | CA |
| 2006-06-21 | 951-797-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | BANNING | CA |
| 2006-06-21 | 951-797-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | BANNING | CA |
| 2006-04-21 | 951-603-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | TEMSCL CNY | CA |
| 2006-04-21 | 951-603-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | TEMSCL CNY | CA |
| 2006-03-08 | 951-824-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | RIVERSIDE | CA |
| 2006-03-08 | 951-824-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | RIVERSIDE | CA |
| 2005-01-11 | 951-616-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | MORENO | CA |
| 2005-01-11 | 951-616-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | MORENO | CA |
| 2004-10-18 | 951-253-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | ELSINORE | CA |
| 2004-10-18 | 951-253-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | ELSINORE | CA |
| 2004-10-18 | 951-257-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | IDYLLWILD | CA |
| 2004-10-18 | 951-257-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | IDYLLWILD | CA |
| 2004-10-18 | 951-537-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | HEMT HEMT | CA |
| 2004-10-18 | 951-537-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | HEMT HEMT | CA |
| 2004-10-18 | 951-639-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | SUN CITY | CA |
| 2004-10-18 | 951-639-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | SUN CITY | CA |
| 2004-05-04 | 951-252-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | TEMECULA | CA |
| 2004-05-04 | 951-252-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | TEMECULA | CA |
| 2004-05-04 | 951-252-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | TEMECULA | CA |
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.