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 346
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2025-04-07 | 346-713-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | SMITHERSLK | TX |
| 2025-04-07 | 346-713-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | SMITHERSLK | TX |
| 2025-04-01 | 346-359-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | LIVERPOOL | TX |
| 2025-04-01 | 346-486-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | LIVERPOOL | TX |
| 2025-04-01 | 346-654-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | PINEHURST | TX |
| 2025-04-01 | 346-654-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | PINEHURST | TX |
| 2025-02-04 | 346-853-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | HSTNSUBURB | TX |
| 2025-02-04 | 346-853-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | HSTNSUBURB | TX |
| 2025-02-04 | 346-856-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | CHANNELVW | TX |
| 2025-02-04 | 346-856-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | CHANNELVW | TX |
| 2025-02-04 | 346-858-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | CLEVELAND | TX |
| 2025-02-04 | 346-858-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | CLEVELAND | TX |
| 2025-01-31 | 346-362-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | SHELDON | TX |
| 2025-01-31 | 346-484-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | SHELDON | TX |
| 2025-01-31 | 346-686-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | MANVEL | TX |
| 2025-01-31 | 346-686-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | MANVEL | TX |
| 2025-01-31 | 346-784-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | SEABROOK | TX |
| 2025-01-31 | 346-784-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | SEABROOK | TX |
| 2025-01-31 | 346-797-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | WESTFIELD | TX |
| 2025-01-31 | 346-797-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | WESTFIELD | TX |
| 2025-01-31 | 346-821-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | SPLENDORA | TX |
| 2025-01-31 | 346-821-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | SPLENDORA | TX |
| 2025-01-30 | 346-735-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | ALVIN | TX |
| 2025-01-30 | 346-735-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | ALVIN | TX |
| 2025-01-30 | 346-790-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | LA PORTE | TX |
| 2025-01-30 | 346-790-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | LA PORTE | TX |
| 2025-01-30 | 346-798-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | FRIENDSWD | TX |
| 2025-01-30 | 346-798-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | FRIENDSWD | TX |
| 2025-01-30 | 346-844-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | DEER PARK | TX |
| 2025-01-30 | 346-844-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | DEER PARK | TX |
| 2023-12-10 | 346-705-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | CHANNELVW | TX |
| 2023-12-10 | 346-713-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | SMITHERSLK | TX |
| 2023-12-10 | 346-713-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | SMITHERSLK | TX |
| 2021-05-13 | 346-462-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | CYPRESS | TX |
| 2021-05-12 | 346-459-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | SPRING | TX |
| 2021-05-12 | 346-460-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | BAMMEL | TX |
| 2021-02-25 | 346-515-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | RICHMNRNBG | TX |
| 2021-02-25 | 346-536-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | SATSUMA | TX |
| 2021-02-25 | 346-576-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | BARKER | TX |
| 2021-02-25 | 346-640-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | LANGHAMCRK | TX |
| 2021-02-25 | 346-645-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | TOMBALL | TX |
| 2020-09-29 | 346-438-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | HOUSTON | TX |
| 2019-04-22 | 346-378-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | HSTNSUBURB | TX |
| 2019-04-22 | 346-378-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | HSTNSUBURB | TX |
| 2018-11-15 | 346-345-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | HUMBLE | TX |
| 2018-11-15 | 346-345-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | HUMBLE | TX |
| 2018-11-14 | 346-354-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | HOUSTON | TX |
| 2018-11-14 | 346-354-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | HOUSTON | TX |
| 2018-11-14 | 346-357-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | HSTNSUBURB | TX |
| 2018-11-14 | 346-357-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | HSTNSUBURB | TX |
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.