NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/24/2026
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 |
|---|---|---|---|---|---|---|---|
| 2025-12-03 | 661-736-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2025-10-21 | 661-672-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2025-10-21 | 661-672-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2025-10-21 | 661-736-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2025-07-21 | 661-672-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2025-07-21 | 661-672-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2025-07-21 | 661-672-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2025-05-30 | 661-672-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2025-05-30 | 661-672-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2025-05-30 | 661-672-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2025-05-30 | 661-672-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2025-03-21 | 661-672-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2025-03-21 | 661-736-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2025-03-21 | 661-736-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2025-03-21 | 661-736-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2025-03-21 | 661-736-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2024-11-13 | 661-736-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2024-11-13 | 661-736-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2024-11-13 | 661-736-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2024-11-13 | 661-736-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2024-09-13 | 661-652-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | SNCA NHCS | CA |
| 2024-09-11 | 661-502-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | SNCA NHCS | CA |
| 2024-08-19 | 661-390-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2024-08-19 | 661-557-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2024-08-19 | 661-649-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2024-06-21 | 661-649-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2024-06-21 | 661-649-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2024-06-21 | 661-649-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2024-03-28 | 661-649-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2024-03-28 | 661-649-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2024-03-28 | 661-649-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | ARVIN | CA |
| 2024-01-23 | 661-820-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2024-01-23 | 661-820-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2024-01-23 | 661-820-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2024-01-23 | 661-820-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2024-01-23 | 661-820-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2024-01-23 | 661-996-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2023-12-01 | 661-595-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2023-12-01 | 661-596-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2023-12-01 | 661-596-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2023-12-01 | 661-596-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2023-12-01 | 661-612-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2023-12-01 | 661-612-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2023-12-01 | 661-612-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2023-12-01 | 661-612-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2023-12-01 | 661-612-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2023-12-01 | 661-612-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | BKFD MAIN | CA |
| 2022-11-09 | 661-597-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | MOJAVE | CA |
| 2022-09-19 | 661-362-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | SNCA NHCS | CA |
| 2022-09-19 | 661-625-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | SNCA NHCS | CA |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/24/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.