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 743
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2024-09-17 | 743-249-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NC | 3235 | GREENSBORO | NC |
| 2024-02-27 | 743-643-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NC | 3235 | GREENSBORO | NC |
| 2023-11-14 | 743-666-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NC | 3235 | GREENSBORO | NC |
| 2023-08-10 | 743-257-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NC | 3235 | WINSTN SAL | NC |
| 2022-08-16 | 743-252-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NC | 3235 | WINSTN SAL | NC |
| 2022-08-16 | 743-252-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NC | 3235 | WINSTN SAL | NC |
| 2022-08-16 | 743-252-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NC | 3235 | WINSTN SAL | NC |
| 2022-08-16 | 743-252-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NC | 3235 | WINSTN SAL | NC |
| 2022-08-16 | 743-252-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NC | 3235 | WINSTN SAL | NC |
| 2022-08-16 | 743-252-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NC | 3235 | WINSTN SAL | NC |
| 2022-08-16 | 743-252-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NC | 3235 | WINSTN SAL | NC |
| 2022-08-16 | 743-252-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NC | 3235 | WINSTN SAL | NC |
| 2022-08-16 | 743-252-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NC | 3235 | WINSTN SAL | NC |
| 2022-08-16 | 743-252-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NC | 3235 | WINSTN SAL | NC |
| 2022-08-12 | 743-253-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NC | 3235 | WINSTN SAL | NC |
| 2022-08-12 | 743-253-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NC | 3235 | WINSTN SAL | NC |
| 2022-08-12 | 743-253-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NC | 3235 | WINSTN SAL | NC |
| 2022-08-12 | 743-253-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NC | 3235 | WINSTN SAL | NC |
| 2022-08-12 | 743-253-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NC | 3235 | WINSTN SAL | NC |
| 2019-06-04 | 743-201-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NC | 3235 | HIGH POINT | NC |
| 2019-06-04 | 743-201-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NC | 3235 | HIGH POINT | NC |
| 2019-05-14 | 743-201-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NC | 3235 | HIGH POINT | NC |
| 2017-11-15 | 743-999-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NC | 3235 | WINSTN SAL | NC |
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.