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
2019-04-26 435-500-0XXX 0000–0999Assigned ONVOY, LLC - UT 871E DELTA UT
2019-04-26 435-500-2XXX 2000–2999Assigned ONVOY, LLC - UT 871E DELTA UT
2019-04-24 435-515-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 BRIGHAM CY UT
2019-04-24 435-515-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 BRIGHAM CY UT
2019-04-24 435-921-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 BRIGHAM CY UT
2019-04-23 435-220-2XXX 2000–2999Assigned ONVOY, LLC - UT 871E MOAB UT
2019-04-23 435-220-3XXX 3000–3999Assigned ONVOY, LLC - UT 871E MOAB UT
2019-04-23 435-291-3XXX 3000–3999Assigned ONVOY, LLC - UT 871E TREMONTON UT
2019-04-23 435-291-4XXX 4000–4999Assigned ONVOY, LLC - UT 871E TREMONTON UT
2019-04-23 435-395-3XXX 3000–3999Assigned ONVOY, LLC - UT 871E HEBER CITY UT
2019-04-23 435-395-4XXX 4000–4999Assigned ONVOY, LLC - UT 871E HEBER CITY UT
2019-04-23 435-419-2XXX 2000–2999Assigned ONVOY, LLC - UT 871E MONTICELLO UT
2019-04-23 435-419-3XXX 3000–3999Assigned ONVOY, LLC - UT 871E MONTICELLO UT
2019-04-23 435-466-1XXX 1000–1999Assigned ONVOY, LLC - UT 871E BEARRIV CY UT
2019-04-23 435-466-2XXX 2000–2999Assigned ONVOY, LLC - UT 871E BEARRIV CY UT
2019-04-23 435-485-7XXX 7000–7999Assigned ONVOY, LLC - UT 871E BLANDING UT
2019-04-23 435-485-9XXX 9000–9999Assigned ONVOY, LLC - UT 871E BLANDING UT
2019-04-23 435-660-4XXX 4000–4999Assigned ONVOY, LLC - UT 871E NEPHI UT
2019-04-23 435-660-5XXX 5000–5999Assigned ONVOY, LLC - UT 871E NEPHI UT
2019-04-23 435-708-2XXX 2000–2999Assigned ONVOY, LLC - UT 871E CEDAR CITY UT
2019-04-23 435-708-3XXX 3000–3999Assigned ONVOY, LLC - UT 871E CEDAR CITY UT
2019-04-09 435-549-3XXX 3000–3999Assigned METROPCS, INC. 5562 VERNAL UT
2019-04-08 435-253-6XXX 6000–6999Assigned ONVOY, LLC - UT 871E FILLMORE UT
2019-04-08 435-253-7XXX 7000–7999Assigned ONVOY, LLC - UT 871E FILLMORE UT
2019-04-08 435-289-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 RICHFIELD UT
2019-03-12 435-515-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 BRIGHAM CY UT
2019-03-08 435-296-9XXX 9000–9999Assigned PEERLESS NETWORK OF UTAH, LLC - UT 526H GLNCNYONCY UT
2019-03-06 435-271-9XXX 9000–9999Assigned PEERLESS NETWORK OF UTAH, LLC - UT 526H SALINA UT
2019-03-06 435-289-9XXX 9000–9999Assigned PEERLESS NETWORK OF UTAH, LLC - UT 526H RICHFIELD UT
2019-03-05 435-375-0XXX 0000–0999Assigned TELNYX LLC 073H ST GEORGE UT
2019-02-28 435-515-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2019-01-30 435-999-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 LOGAN UT
2019-01-25 435-666-6XXX 6000–6999Assigned FRACTEL, LLC 965H PARK CITY UT
2019-01-24 435-264-4XXX 4000–4999Assigned ONVOY, LLC - UT 871E NAT BRIDGE UT
2019-01-24 435-269-4XXX 4000–4999Assigned ONVOY, LLC - UT 871E BLUFF UT
2019-01-24 435-280-4XXX 4000–4999Assigned ONVOY, LLC - UT 871E MEXICANHAT UT
2019-01-24 435-284-4XXX 4000–4999Assigned ONVOY, LLC - UT 871E KANOSH UT
2019-01-24 435-325-4XXX 4000–4999Assigned ONVOY, LLC - UT 871E MEADOW UT
2019-01-24 435-337-4XXX 4000–4999Assigned ONVOY, LLC - UT 871E LAKEPOWELL UT
2019-01-24 435-344-4XXX 4000–4999Assigned ONVOY, LLC - UT 871E LA SAL UT
2019-01-24 435-345-4XXX 4000–4999Assigned ONVOY, LLC - UT 871E THOMPSON UT
2019-01-24 435-432-4XXX 4000–4999Assigned ONVOY, LLC - UT 871E PROMONTORY UT
2019-01-24 435-441-4XXX 4000–4999Assigned ONVOY, LLC - UT 871E HOLDEN UT
2019-01-24 435-495-4XXX 4000–4999Assigned ONVOY, LLC - UT 871E OAK CITY UT
2019-01-10 435-609-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CASTLEDALE UT
2018-12-27 435-999-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LOGAN UT
2018-12-27 435-999-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LOGAN UT
2018-12-21 435-375-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ST GEORGE UT
2018-12-21 435-375-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ST GEORGE UT
2018-12-18 435-395-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HEBER CITY 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.