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
2014-10-23 435-359-5XXX 5000–5999Assigned ONVOY, LLC - UT 871E ST GEORGE UT
2014-10-21 435-670-1XXX 1000–1999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 SALINA UT
2014-10-15 435-261-5XXX 5000–5999Assigned CENTRAL TELCOM SVCS DBA CENTRACOM INTERACTIVE - NV 791D BEAVER UT
2014-10-15 435-359-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F ST GEORGE UT
2014-10-01 435-315-6XXX 6000–6999Assigned METROPCS, INC. 5562 HEBER CITY UT
2014-10-01 435-315-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 HEBER CITY UT
2014-10-01 435-315-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 HEBER CITY UT
2014-09-29 435-619-8XXX 8000–8999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 ST GEORGE UT
2014-09-29 435-703-2XXX 2000–2999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 ST GEORGE UT
2014-09-26 435-491-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BICKNELL UT
2014-09-23 435-901-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PARK CITY UT
2014-09-15 435-255-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 TOOELE UT
2014-09-15 435-703-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - UT 7530 ST GEORGE UT
2014-09-05 435-241-1XXX 1000–1999Assigned ONVOY, LLC - UT 871E TOOELE UT
2014-09-02 435-731-5XXX 5000–5999Assigned ONVOY, LLC - UT 871E PARK CITY UT
2014-09-02 435-776-0XXX 0000–0999Assigned ONVOY, LLC - UT 871E PARK CITY UT
2014-08-28 435-849-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TOOELE UT
2014-08-28 435-994-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LOGAN UT
2014-08-22 435-233-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F CEDAR CITY UT
2014-08-20 435-703-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F ST GEORGE UT
2014-07-29 435-705-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ST GEORGE UT
2014-07-29 435-901-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PARK CITY UT
2014-07-14 435-799-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 LOGAN UT
2014-07-10 435-255-0XXX 0000–0999Assigned METROPCS, INC. 5562 TOOELE UT
2014-07-10 435-255-9XXX 9000–9999Assigned METROPCS, INC. 5562 TOOELE UT
2014-07-10 435-265-0XXX 0000–0999Assigned METROPCS, INC. 5562 LOGAN UT
2014-07-10 435-265-9XXX 9000–9999Assigned METROPCS, INC. 5562 LOGAN UT
2014-07-03 435-799-6XXX 6000–6999Assigned METROPCS, INC. 5562 LOGAN UT
2014-07-02 435-226-3XXX 3000–3999Assigned METROPCS, INC. 5562 BRIGHAM CY UT
2014-07-02 435-538-0XXX 0000–0999Assigned METROPCS, INC. 5562 BRIGHAM CY UT
2014-06-16 435-572-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - UT 7530 CEDAR CITY UT
2014-06-11 435-287-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 RICHFIELD UT
2014-06-11 435-740-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 BRIGHAM CY UT
2014-05-27 435-228-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F TOOELE UT
2014-05-27 435-339-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 BRIGHAM CY UT
2014-05-27 435-850-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F TOOELE UT
2014-05-21 435-218-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 ST GEORGE UT
2014-05-21 435-218-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 ST GEORGE UT
2014-05-21 435-218-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 ST GEORGE UT
2014-05-19 435-233-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F CEDAR CITY UT
2014-04-17 435-261-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F BEAVER UT
2014-04-17 435-315-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F HEBER CITY UT
2014-04-17 435-393-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F PAROWAN UT
2014-04-16 435-731-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F PARK CITY UT
2014-04-16 435-731-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F PARK CITY UT
2014-03-28 435-799-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LOGAN UT
2014-03-27 435-602-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J PARK CITY UT
2014-03-18 435-919-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BRIGHAM CY UT
2014-03-12 435-776-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 PARK CITY UT
2014-03-03 435-776-1XXX 1000–1999Assigned CENTRAL TELCOM SVCS DBA CENTRACOM INTERACTIVE - NV 791D PARK 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.