NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

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 408
T-MOBILE USA, INC. 230
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2025-06-18 408-583-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CAMPBELL CA
2025-06-18 408-688-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CAMPBELL CA
2024-02-29 408-304-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SARATOGA CA
2024-02-29 408-304-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SARATOGA CA
2024-02-29 408-304-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SARATOGA CA
2024-02-29 408-304-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SARATOGA CA
2024-02-29 408-304-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SARATOGA CA
2024-02-29 408-304-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SARATOGA CA
2024-01-10 408-312-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 SAN MARTIN CA
2024-01-10 408-312-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SAN MARTIN CA
2024-01-10 408-312-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SAN MARTIN CA
2024-01-10 408-312-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SAN MARTIN CA
2024-01-10 408-312-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SAN MARTIN CA
2023-11-08 408-303-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 SARATOGA CA
2023-11-08 408-303-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 SARATOGA CA
2023-10-10 408-303-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 SARATOGA CA
2023-10-10 408-303-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 SARATOGA CA
2023-10-10 408-303-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SARATOGA CA
2023-10-10 408-303-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SARATOGA CA
2023-07-13 408-303-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SARATOGA CA
2023-07-13 408-303-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SARATOGA CA
2023-07-13 408-303-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SARATOGA CA
2023-07-13 408-303-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SARATOGA CA
2022-09-01 408-581-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 SNJS WEST CA
2022-09-01 408-581-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 SNJS WEST CA
2022-09-01 408-581-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 SNJS WEST CA
2022-09-01 408-581-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SNJS WEST CA
2022-09-01 408-581-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SNJS WEST CA
2022-04-20 408-693-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 SNJS SOUTH CA
2021-04-09 408-333-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 SNJS SOUTH CA
2021-04-09 408-333-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 SNJS SOUTH CA
2021-04-09 408-333-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SNJS SOUTH CA
2021-04-09 408-333-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SNJS SOUTH CA
2021-04-09 408-333-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SNJS SOUTH CA
2020-11-05 408-876-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 SNJS NORTH CA
2020-10-15 408-754-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SNJS SOUTH CA
2020-10-15 408-754-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SNJS SOUTH CA
2020-09-09 408-876-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 SNJS NORTH CA
2020-09-01 408-752-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 SUNNYVALE CA
2020-08-25 408-549-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SNJS WEST CA
2020-08-25 408-549-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SNJS WEST CA
2020-08-25 408-549-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SNJS WEST CA
2018-12-24 408-763-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 MORGANHILL CA
2018-11-02 408-604-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SUNNYVALE CA
2018-08-23 408-362-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SNJS SOUTH CA
2016-08-08 408-752-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SUNNYVALE CA
2016-08-04 408-493-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SNJS NORTH CA
2016-08-04 408-941-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SNJS NORTH CA
2016-07-19 408-360-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SNJS SOUTH CA
2015-09-14 408-669-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SNJS SOUTH 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.