NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

43 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026

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, last 30 days — NPA 435
UINTAH BASIN ELECTRONIC TELECOMMUNICATIONS 40
TDS BROADBAND SERVICE LLC 1
PEERLESS NETWORK OF UTAH, LLC - UT 1
AHOI LLC 1
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
2011-04-28 435-243-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-04-28 435-243-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-04-28 435-496-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-04-28 435-496-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-04-28 435-496-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-04-28 435-496-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-04-28 435-496-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-04-28 435-496-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-04-28 435-728-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-04-28 435-775-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-04-28 435-775-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-04-28 435-775-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-04-28 435-775-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-04-28 435-840-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-04-28 435-840-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-04-28 435-840-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-04-28 435-841-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-04-28 435-841-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-04-28 435-841-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-04-28 435-841-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-04-28 435-938-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 LOGAN UT
2011-04-28 435-938-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 LOGAN UT
2011-04-28 435-938-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 LOGAN UT
2011-04-12 435-525-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ST GEORGE UT
2011-04-12 435-890-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LOGAN UT
2011-03-23 435-485-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 BLANDING UT
2011-03-11 435-261-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F BEAVER UT
2011-03-10 435-703-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F ST GEORGE UT
2011-03-09 435-633-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F RICHFIELD UT
2011-03-02 435-714-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 PARK CITY UT
2011-03-02 435-714-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 PARK CITY UT
2011-02-25 435-714-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PARK CITY UT
2011-02-22 435-401-4XXX 4000–4999Assigned METROPCS, INC. 5562 ROOSEVELT UT
2011-02-18 435-327-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CEDAR CITY UT
2011-02-18 435-327-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CEDAR CITY UT
2011-02-18 435-327-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CEDAR CITY UT
2011-02-14 435-287-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F RICHFIELD UT
2011-02-10 435-299-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 PRICE UT
2011-02-04 435-258-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 LOGAN UT
2011-02-04 435-772-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 ST GEORGE UT
2011-02-03 435-219-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 VERNAL UT
2011-02-03 435-659-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 PARK CITY UT
2011-02-02 435-562-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALINA UT
2011-02-02 435-710-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 PAROWAN UT
2011-01-28 435-525-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 ST GEORGE UT
2011-01-28 435-525-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 ST GEORGE UT
2011-01-28 435-525-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 ST GEORGE UT
2011-01-28 435-525-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 ST GEORGE UT
2011-01-28 435-525-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 ST GEORGE UT
2011-01-28 435-525-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 ST GEORGE UT

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.