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 858
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2025-11-28 | 858-322-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | SNDG MRMS | CA |
| 2025-11-28 | 858-445-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | SNDG MRMS | CA |
| 2025-10-24 | 858-322-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | SNDG MRMS | CA |
| 2025-10-24 | 858-329-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | SNDG MRMS | CA |
| 2025-10-21 | 858-439-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | CHULAVISTA | CA |
| 2025-10-21 | 858-439-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | CHULAVISTA | CA |
| 2025-10-21 | 858-439-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | CHULAVISTA | CA |
| 2025-10-21 | 858-439-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | CHULAVISTA | CA |
| 2025-10-21 | 858-443-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | CHULAVISTA | CA |
| 2024-10-31 | 858-288-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | SNDG MRMS | CA |
| 2024-09-19 | 858-415-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | SNDG SNDG | CA |
| 2024-09-19 | 858-415-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | SNDG SNDG | CA |
| 2024-09-19 | 858-415-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | SNDG SNDG | CA |
| 2024-09-19 | 858-415-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | SNDG SNDG | CA |
| 2024-09-19 | 858-415-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | SNDG SNDG | CA |
| 2024-09-19 | 858-415-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | SNDG SNDG | CA |
| 2024-08-30 | 858-407-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | CHULAVISTA | CA |
| 2024-08-29 | 858-902-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | CHULAVISTA | CA |
| 2024-08-29 | 858-902-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | CHULAVISTA | CA |
| 2024-06-03 | 858-902-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | CHULAVISTA | CA |
| 2024-06-03 | 858-902-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | CHULAVISTA | CA |
| 2024-06-03 | 858-902-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | CHULAVISTA | CA |
| 2024-06-03 | 858-902-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | CHULAVISTA | CA |
| 2024-05-22 | 858-392-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | SNDG LVTA | CA |
| 2024-03-25 | 858-392-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | SNDG LVTA | CA |
| 2024-01-19 | 858-288-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | SNDG MRMS | CA |
| 2024-01-11 | 858-389-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | CHULAVISTA | CA |
| 2024-01-11 | 858-389-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | CHULAVISTA | CA |
| 2024-01-11 | 858-389-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | CHULAVISTA | CA |
| 2023-10-10 | 858-318-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | CHULAVISTA | CA |
| 2023-10-10 | 858-318-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | CHULAVISTA | CA |
| 2023-10-10 | 858-318-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | CHULAVISTA | CA |
| 2023-10-10 | 858-389-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | CHULAVISTA | CA |
| 2023-08-10 | 858-331-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | CHULAVISTA | CA |
| 2023-08-10 | 858-331-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | CHULAVISTA | CA |
| 2023-08-10 | 858-331-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | CHULAVISTA | CA |
| 2023-08-10 | 858-331-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | CHULAVISTA | CA |
| 2022-10-28 | 858-341-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | CHULAVISTA | CA |
| 2022-10-28 | 858-341-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | CHULAVISTA | CA |
| 2022-10-26 | 858-331-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | CHULAVISTA | CA |
| 2022-10-26 | 858-331-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | CHULAVISTA | CA |
| 2022-01-13 | 858-328-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | LA MESA | CA |
| 2022-01-13 | 858-328-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | LA MESA | CA |
| 2022-01-13 | 858-328-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | LA MESA | CA |
| 2021-11-18 | 858-330-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | RNCHOPNQTS | CA |
| 2021-11-18 | 858-330-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | RNCHOPNQTS | CA |
| 2021-11-18 | 858-428-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | RNCHOPNQTS | CA |
| 2021-11-18 | 858-672-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | RNCHOPNQTS | CA |
| 2021-11-18 | 858-834-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | RNCHOPNQTS | CA |
| 2021-11-16 | 858-327-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | SNDG SNDG | CA |
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.