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 813
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2024-05-23 | 813-537-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | TAMPAWST | FL |
| 2024-05-23 | 813-537-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | TAMPAWST | FL |
| 2021-09-02 | 813-798-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | PLANT CITY | FL |
| 2021-09-02 | 813-825-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | TAMPANTH | FL |
| 2021-09-02 | 813-861-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | TAMPAEST | FL |
| 2021-09-02 | 813-923-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | ZEPHYRHILS | FL |
| 2021-07-21 | 813-687-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | TAMPAWST | FL |
| 2021-07-21 | 813-791-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | TAMPASTH | FL |
| 2020-09-09 | 813-698-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | TAMPACEN | FL |
| 2017-11-16 | 813-536-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | TAMPANTH | FL |
| 2017-11-16 | 813-547-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | TAMPAWST | FL |
| 2017-11-16 | 813-548-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | TAMPAEST | FL |
| 2016-02-25 | 813-473-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | PLANT CITY | FL |
| 2016-02-25 | 813-703-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | PLANT CITY | FL |
| 2016-02-24 | 813-614-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | TAMPACEN | FL |
| 2016-02-24 | 813-614-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | TAMPACEN | FL |
| 2016-02-24 | 813-773-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | TAMPASTH | FL |
| 2015-08-27 | 813-533-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | TAMPACEN | FL |
| 2015-03-09 | 813-670-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | ZEPHYRHILS | FL |
| 2013-07-30 | 813-737-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | PLANT CITY | FL |
| 2013-03-22 | 813-515-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | TAMPACEN | FL |
| 2013-03-18 | 813-331-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | TAMPASTH | FL |
| 2013-03-18 | 813-502-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | TAMPAEST | FL |
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.