NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

43 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, 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
2010-04-01 435-535-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 LOGAN UT
2010-04-01 435-535-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 LOGAN UT
2010-04-01 435-554-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 LOGAN UT
2010-04-01 435-554-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 LOGAN UT
2010-04-01 435-554-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 LOGAN UT
2010-04-01 435-554-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 LOGAN UT
2010-04-01 435-554-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 LOGAN UT
2010-04-01 435-571-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 PARK CITY UT
2010-04-01 435-571-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 PARK CITY UT
2010-04-01 435-571-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 PARK CITY UT
2010-04-01 435-571-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 PARK CITY UT
2010-04-01 435-571-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PARK CITY UT
2010-04-01 435-571-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PARK CITY UT
2010-04-01 435-571-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PARK CITY UT
2010-04-01 435-571-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PARK CITY UT
2010-04-01 435-571-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PARK CITY UT
2010-04-01 435-774-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 LOGAN UT
2010-04-01 435-774-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 LOGAN UT
2010-04-01 435-774-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 LOGAN UT
2010-04-01 435-774-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 LOGAN UT
2010-04-01 435-915-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 LOGAN UT
2010-04-01 435-915-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 LOGAN UT
2010-03-25 435-239-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2010-03-25 435-239-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2010-03-25 435-239-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2010-03-25 435-494-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2010-03-25 435-494-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2010-03-25 435-494-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2010-03-25 435-494-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2010-03-25 435-494-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2010-03-25 435-494-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2010-03-25 435-494-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2010-03-11 435-708-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F CEDAR CITY UT
2010-03-05 435-767-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 ST GEORGE UT
2010-03-01 435-767-9XXX 9000–9999Assigned FIRSTDIGITAL COMMUNICATIONS, LLC 716D ST GEORGE UT
2010-02-23 435-767-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F ST GEORGE UT
2010-02-10 435-630-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 PRICE UT
2010-02-09 435-287-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 RICHFIELD UT
2010-02-09 435-535-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 LOGAN UT
2010-02-09 435-659-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 PARK CITY UT
2010-02-08 435-251-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 ST GEORGE UT
2010-02-08 435-256-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 ST GEORGE UT
2010-02-08 435-272-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 ST GEORGE UT
2010-02-08 435-272-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 ST GEORGE UT
2010-02-08 435-275-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 ST GEORGE UT
2010-02-08 435-767-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 ST GEORGE UT
2010-02-08 435-767-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 ST GEORGE UT
2010-02-08 435-767-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 ST GEORGE UT
2010-02-08 435-767-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 ST GEORGE UT
2010-02-08 435-767-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 ST GEORGE UT

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.