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 661
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2022-09-21 | 661-239-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | WALKERBSIN | CA |
| 2022-09-21 | 661-239-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | WALKERBSIN | CA |
| 2022-09-21 | 661-552-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | EARLIMART | CA |
| 2022-09-21 | 661-552-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | EARLIMART | CA |
| 2022-09-21 | 661-780-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | PLDL LNVY | CA |
| 2020-11-25 | 661-624-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | BKFD SOUTH | CA |
| 2015-08-21 | 661-306-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | LAKEHUGHES | CA |
| 2015-08-21 | 661-339-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | HI VISTA | CA |
| 2015-08-21 | 661-522-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | LANCASTER | CA |
| 2006-08-31 | 661-214-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | LOST HILLS | CA |
| 2006-08-31 | 661-214-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | LOST HILLS | CA |
| 2006-08-31 | 661-413-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | CUYAMA | CA |
| 2006-08-31 | 661-413-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | CUYAMA | CA |
| 2006-08-31 | 661-469-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | BUTTONWLLW | CA |
| 2006-08-31 | 661-551-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | BERENDMESA | CA |
| 2006-08-31 | 661-551-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | BERENDMESA | CA |
| 2006-08-31 | 661-591-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | GLENNVILLE | CA |
| 2006-08-31 | 661-591-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | GLENNVILLE | CA |
| 2006-08-31 | 661-689-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | CLFRNHTSPG | CA |
| 2006-08-31 | 661-689-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | CLFRNHTSPG | CA |
| 2006-08-31 | 661-704-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | MCKITTRICK | CA |
| 2006-08-31 | 661-704-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | MCKITTRICK | CA |
| 2006-08-31 | 661-745-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | TAFT | CA |
| 2006-08-31 | 661-745-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | TAFT | CA |
| 2006-08-31 | 661-927-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | MCFARLAND | CA |
| 2006-08-31 | 661-927-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | MCFARLAND | 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.