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
2011-09-26 435-319-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F ST GEORGE UT
2011-09-21 435-677-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F BRIAN HEAD UT
2011-09-19 435-659-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 PARK CITY UT
2011-09-14 435-772-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 ST GEORGE UT
2011-09-01 435-562-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F SALINA UT
2011-08-26 435-238-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CEDAR CITY UT
2011-08-26 435-267-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CEDAR CITY UT
2011-08-26 435-267-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CEDAR CITY UT
2011-08-26 435-919-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2011-08-17 435-412-8XXX 8000–8999Assigned ONVOY, LLC - UT 871E GLNCNYONCY UT
2011-08-09 435-503-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HEBER CITY UT
2011-07-27 435-631-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F PARK CITY UT
2011-07-26 435-238-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CEDAR CITY UT
2011-07-19 435-565-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F PARK CITY UT
2011-07-11 435-299-1XXX 1000–1999Assigned METROPCS, INC. 5562 PRICE UT
2011-07-08 435-215-0XXX 0000–0999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 ST GEORGE UT
2011-07-08 435-919-1XXX 1000–1999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 BRIGHAM CY UT
2011-07-07 435-659-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 PARK CITY UT
2011-07-05 435-237-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2011-07-05 435-237-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2011-07-05 435-237-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2011-07-01 435-224-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-07-01 435-224-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-07-01 435-224-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-07-01 435-224-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-07-01 435-224-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-07-01 435-224-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-07-01 435-224-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-07-01 435-225-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2011-07-01 435-225-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2011-07-01 435-225-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2011-07-01 435-775-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-07-01 435-849-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-07-01 435-850-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2011-06-30 435-219-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 VERNAL UT
2011-06-30 435-238-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CEDAR CITY UT
2011-06-30 435-401-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ROOSEVELT UT
2011-06-28 435-228-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J TOOELE UT
2011-06-24 435-633-2XXX 2000–2999Assigned FIRSTDIGITAL COMMUNICATIONS, LLC 716D RICHFIELD UT
2011-06-24 435-994-3XXX 3000–3999Assigned FIRSTDIGITAL COMMUNICATIONS, LLC 716D LOGAN UT
2011-06-09 435-740-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 BRIGHAM CY UT
2011-06-08 435-237-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2011-06-08 435-562-8XXX 8000–8999Assigned ONVOY, LLC - UT 871E SALINA UT
2011-06-08 435-677-7XXX 7000–7999Assigned ONVOY, LLC - UT 871E BRIAN HEAD UT
2011-06-08 435-703-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ST GEORGE UT
2011-05-24 435-525-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F ST GEORGE UT
2011-05-24 435-538-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F BRIGHAM CY UT
2011-05-24 435-849-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F TOOELE UT
2011-05-17 435-776-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F PARK CITY UT
2011-05-05 435-893-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 RICHFIELD 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.