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
2023-09-27 435-701-4XXX 4000–4999Assigned ONVOY, LLC - UT 871E CEDAR CITY UT
2023-09-21 435-358-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 COALVILLE UT
2023-09-21 435-358-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 COALVILLE UT
2023-09-06 435-357-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ST GEORGE UT
2023-08-31 435-324-9XXX 9000–9999Assigned PEERLESS NETWORK OF UTAH, LLC - UT 526H HEBER CITY UT
2023-08-31 435-538-6XXX 6000–6999Assigned PEERLESS NETWORK OF UTAH, LLC - UT 526H BRIGHAM CY UT
2023-08-31 435-567-6XXX 6000–6999Assigned PEERLESS NETWORK OF UTAH, LLC - UT 526H RICHFIELD UT
2023-08-21 435-350-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 COALVILLE UT
2023-08-21 435-699-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 PARK CITY UT
2023-08-17 435-264-9XXX 9000–9999Assigned ONVOY, LLC - UT 871E NAT BRIDGE UT
2023-08-15 435-278-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 ENTERPRISE UT
2023-08-15 435-299-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 PRICE UT
2023-08-09 435-354-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TOOELE UT
2023-07-12 435-288-7XXX 7000–7999Assigned ONVOY, LLC - UT 871E ST GEORGE UT
2023-07-12 435-317-5XXX 5000–5999Assigned ONVOY, LLC - UT 871E LOGAN UT
2023-07-12 435-319-7XXX 7000–7999Assigned ONVOY, LLC - UT 871E ST GEORGE UT
2023-07-12 435-351-0XXX 0000–0999Assigned ONVOY, LLC - UT 871E ST GEORGE UT
2023-07-12 435-351-4XXX 4000–4999Assigned ONVOY, LLC - UT 871E ST GEORGE UT
2023-07-12 435-351-5XXX 5000–5999Assigned ONVOY, LLC - UT 871E ST GEORGE UT
2023-07-12 435-351-6XXX 6000–6999Assigned ONVOY, LLC - UT 871E ST GEORGE UT
2023-07-12 435-351-7XXX 7000–7999Assigned ONVOY, LLC - UT 871E ST GEORGE UT
2023-07-12 435-351-8XXX 8000–8999Assigned ONVOY, LLC - UT 871E ST GEORGE UT
2023-07-12 435-534-7XXX 7000–7999Assigned ONVOY, LLC - UT 871E LOGAN UT
2023-07-12 435-667-0XXX 0000–0999Assigned ONVOY, LLC - UT 871E BRIGHAM CY UT
2023-07-12 435-667-1XXX 1000–1999Assigned ONVOY, LLC - UT 871E BRIGHAM CY UT
2023-07-12 435-667-3XXX 3000–3999Assigned ONVOY, LLC - UT 871E BRIGHAM CY UT
2023-07-06 435-296-8XXX 8000–8999Assigned TELNYX LLC 073H GLNCNYONCY UT
2023-07-05 435-351-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ST GEORGE UT
2023-06-26 435-775-5XXX 5000–5999Assigned ONVOY, LLC - UT 871E TOOELE UT
2023-06-16 435-348-8XXX 8000–8999Assigned TELNYX LLC 073H FILLMORE UT
2023-06-02 435-746-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 KAMAS UT
2023-06-02 435-746-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 KAMAS UT
2023-06-02 435-856-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J NEPHI UT
2023-06-01 435-270-1XXX 1000–1999Assigned TELNYX LLC 073H BLANDING UT
2023-05-15 435-281-9XXX 9000–9999Assigned TELNYX LLC 073H WASATCH UT
2023-05-05 435-350-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 COALVILLE UT
2023-05-05 435-350-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 COALVILLE UT
2023-05-05 435-350-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 COALVILLE UT
2023-05-05 435-350-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 COALVILLE UT
2023-04-13 435-900-9XXX 9000–9999Assigned BOOST SUBSCRIBERCO L.L.C. 490J ST GEORGE UT
2023-04-12 435-288-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 ST GEORGE UT
2023-04-12 435-567-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 RICHFIELD UT
2023-04-11 435-309-4XXX 4000–4999Assigned ONVOY, LLC - UT 871E GLNCNYONCY UT
2023-04-11 435-351-1XXX 1000–1999Assigned ONVOY, LLC - UT 871E ST GEORGE UT
2023-04-11 435-351-2XXX 2000–2999Assigned ONVOY, LLC - UT 871E ST GEORGE UT
2023-04-06 435-699-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 PARK CITY UT
2023-04-06 435-800-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 PARK CITY UT
2023-04-06 435-899-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 KANAB UT
2023-03-23 435-691-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 CEDAR CITY UT
2023-02-10 435-350-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 COALVILLE 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.