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
2012-03-06 435-740-8XXX 8000–8999Assigned ONVOY, LLC - UT 871E BRIGHAM CY UT
2012-02-28 435-740-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2012-02-23 435-267-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CEDAR CITY UT
2012-02-23 435-267-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CEDAR CITY UT
2012-02-23 435-267-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CEDAR CITY UT
2012-02-23 435-868-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CEDAR CITY UT
2012-02-13 435-418-7XXX 7000–7999Assigned ONVOY, LLC - UT 871E BEAVER UT
2012-02-08 435-856-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NEPHI UT
2012-02-03 435-962-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 PARK CITY UT
2012-02-03 435-962-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 PARK CITY UT
2012-02-03 435-962-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 PARK CITY UT
2012-02-03 435-962-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PARK CITY UT
2012-01-31 435-338-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2012-01-31 435-496-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2012-01-31 435-775-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2012-01-17 435-414-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 ST GEORGE UT
2012-01-09 435-299-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 PRICE UT
2012-01-09 435-383-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 CEDAR CITY UT
2011-12-28 435-200-2XXX 2000–2999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 PARK CITY UT
2011-12-27 435-631-3XXX 3000–3999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 PARK CITY UT
2011-12-27 435-631-8XXX 8000–8999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 PARK CITY UT
2011-12-27 435-714-5XXX 5000–5999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 PARK CITY UT
2011-12-27 435-729-1XXX 1000–1999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 PARK CITY UT
2011-12-27 435-729-2XXX 2000–2999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 PARK CITY UT
2011-12-27 435-729-3XXX 3000–3999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 PARK CITY UT
2011-12-27 435-729-4XXX 4000–4999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 PARK CITY UT
2011-12-27 435-729-5XXX 5000–5999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 PARK CITY UT
2011-12-27 435-729-6XXX 6000–6999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 PARK CITY UT
2011-12-27 435-729-8XXX 8000–8999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 PARK CITY UT
2011-12-15 435-740-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2011-12-15 435-744-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2011-12-15 435-744-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2011-12-08 435-267-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CEDAR CITY UT
2011-12-08 435-267-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CEDAR CITY UT
2011-12-08 435-327-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CEDAR CITY UT
2011-11-23 435-200-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J PARK CITY UT
2011-11-22 435-414-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 ST GEORGE UT
2011-11-16 435-319-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 ST GEORGE UT
2011-11-16 435-319-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 ST GEORGE UT
2011-11-16 435-319-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 ST GEORGE UT
2011-11-15 435-253-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 FILLMORE UT
2011-11-15 435-260-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 MOAB UT
2011-10-28 435-477-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F PAROWAN UT
2011-10-13 435-241-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TOOELE UT
2011-10-13 435-730-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BRIGHAM CY UT
2011-10-13 435-754-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LOGAN UT
2011-10-12 435-239-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2011-10-12 435-919-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2011-10-04 435-714-7XXX 7000–7999Assigned ONVOY, LLC - UT 871E PARK CITY UT
2011-09-26 435-258-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F LOGAN 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.