NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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 435
T-MOBILE USA, INC. 351
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
2026-05-27 435-366-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 ST GEORGE UT
2026-05-27 435-366-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 ST GEORGE UT
2026-04-29 435-365-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 HEBER CITY UT
2026-04-29 435-365-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 HEBER CITY UT
2026-04-29 435-366-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 ST GEORGE UT
2026-04-29 435-366-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 ST GEORGE UT
2025-12-03 435-369-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2025-10-07 435-538-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2025-08-28 435-328-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 HEBER CITY UT
2025-08-28 435-365-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 HEBER CITY UT
2025-08-28 435-365-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 HEBER CITY UT
2025-08-19 435-295-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2025-08-19 435-730-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2025-06-18 435-667-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2025-05-16 435-289-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 RICHFIELD UT
2025-05-15 435-328-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 HEBER CITY UT
2025-05-15 435-328-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 HEBER CITY UT
2025-04-08 435-749-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CASTLEDALE UT
2025-03-06 435-328-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 HEBER CITY UT
2024-12-06 435-328-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 HEBER CITY UT
2024-12-06 435-328-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 HEBER CITY UT
2024-10-23 435-314-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 EPHRAIM UT
2024-10-23 435-549-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 VERNAL UT
2024-08-28 435-328-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 HEBER CITY UT
2024-08-28 435-328-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 HEBER CITY UT
2024-05-31 435-357-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 ST GEORGE UT
2024-05-31 435-360-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 ST GEORGE UT
2024-05-31 435-567-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 RICHFIELD UT
2024-05-23 435-328-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 HEBER CITY UT
2024-01-22 435-621-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 VERNAL UT
2024-01-16 435-314-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 EPHRAIM UT
2023-08-15 435-299-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 PRICE UT
2022-11-30 435-549-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 VERNAL UT
2022-11-21 435-580-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 NEPHI UT
2022-10-18 435-299-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PRICE UT
2022-08-18 435-314-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 EPHRAIM UT
2022-08-10 435-567-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 RICHFIELD UT
2022-03-21 435-630-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 PRICE UT
2022-01-26 435-610-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 NEPHI UT
2021-03-11 435-289-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 RICHFIELD UT
2021-01-29 435-299-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PRICE UT
2021-01-12 435-549-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 VERNAL UT
2020-11-18 435-314-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 EPHRAIM UT
2020-01-03 435-246-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2020-01-03 435-314-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 EPHRAIM UT
2019-12-27 435-681-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 NEPHI UT
2019-04-08 435-289-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 RICHFIELD UT
2019-02-28 435-515-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2017-11-30 435-777-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 HEBER CITY UT
2017-09-28 435-314-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 EPHRAIM UT

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.