NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026
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 341
New assignments by month
Sep 2026
Aug 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2025-11-28 | 341-259-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | ELSBR-PINL | CA |
| 2025-11-28 | 341-259-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | ELSBR-PINL | CA |
| 2025-11-28 | 341-265-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | ELSBR-PINL | CA |
| 2025-05-16 | 341-259-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | ELSBR-PINL | CA |
| 2025-05-16 | 341-259-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | ELSBR-PINL | CA |
| 2025-05-16 | 341-259-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | ELSBR-PINL | CA |
| 2025-03-28 | 341-259-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | ELSBR-PINL | CA |
| 2025-03-28 | 341-259-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | ELSBR-PINL | CA |
| 2025-03-28 | 341-259-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | ELSBR-PINL | CA |
| 2024-11-14 | 341-251-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | ELSBR-PINL | CA |
| 2024-11-14 | 341-259-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | ELSBR-PINL | CA |
| 2024-09-13 | 341-256-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD FRTVL | CA |
| 2024-09-11 | 341-250-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD FRTVL | CA |
| 2024-09-09 | 341-254-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD BKLY | CA |
| 2024-09-06 | 341-253-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD BKLY | CA |
| 2024-08-29 | 341-251-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | ELSBR-PINL | CA |
| 2024-08-29 | 341-251-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | ELSBR-PINL | CA |
| 2024-08-19 | 341-240-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | HAYWARD | CA |
| 2024-07-29 | 341-250-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD FRTVL | CA |
| 2024-07-29 | 341-250-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD FRTVL | CA |
| 2024-07-29 | 341-250-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD FRTVL | CA |
| 2024-07-29 | 341-250-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD FRTVL | CA |
| 2024-06-03 | 341-252-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | FRNK MAIN | CA |
| 2024-05-31 | 341-239-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD ALMD | CA |
| 2024-05-31 | 341-239-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD ALMD | CA |
| 2024-04-03 | 341-239-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD ALMD | CA |
| 2024-03-27 | 341-251-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | ELSBR-PINL | CA |
| 2024-01-23 | 341-238-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD FRTVL | CA |
| 2024-01-23 | 341-238-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD FRTVL | CA |
| 2024-01-23 | 341-238-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD FRTVL | CA |
| 2024-01-23 | 341-238-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD FRTVL | CA |
| 2024-01-23 | 341-238-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD FRTVL | CA |
| 2024-01-23 | 341-244-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD TRNID | CA |
| 2024-01-23 | 341-244-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD TRNID | CA |
| 2024-01-23 | 341-344-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD TRNID | CA |
| 2023-11-08 | 341-242-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | RICHMOND | CA |
| 2023-11-08 | 341-242-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | RICHMOND | CA |
| 2023-11-08 | 341-242-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | RICHMOND | CA |
| 2023-11-08 | 341-242-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | RICHMOND | CA |
| 2023-11-01 | 341-240-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | HAYWARD | CA |
| 2023-11-01 | 341-240-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | HAYWARD | CA |
| 2023-11-01 | 341-240-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | HAYWARD | CA |
| 2023-09-25 | 341-237-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD BKLY | CA |
| 2023-08-23 | 341-231-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | ELSBR-PINL | CA |
| 2023-08-23 | 341-231-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | ELSBR-PINL | CA |
| 2023-08-23 | 341-231-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | ELSBR-PINL | CA |
| 2023-05-08 | 341-231-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | ELSBR-PINL | CA |
| 2023-05-08 | 341-231-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | ELSBR-PINL | CA |
| 2023-05-08 | 341-231-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | ELSBR-PINL | CA |
| 2023-02-15 | 341-218-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD FRTVL | CA |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.