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
2018-09-25 435-990-9XXX 9000–9999Assigned ONVOY, LLC - UT 871E BRIAN HEAD UT
2018-09-25 435-999-5XXX 5000–5999Assigned ONVOY, LLC - UT 871E LOGAN UT
2018-09-20 435-236-8XXX 8000–8999Assigned METROPCS, INC. 5562 ST GEORGE UT
2018-09-20 435-515-4XXX 4000–4999Assigned FIRSTDIGITAL COMMUNICATIONS, LLC 716D BRIGHAM CY UT
2018-09-12 435-777-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J HEBER CITY UT
2018-09-11 435-310-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F BEAVER UT
2018-09-11 435-393-9XXX 9000–9999Assigned TELNYX LLC 073H PAROWAN UT
2018-09-11 435-612-9XXX 9000–9999Assigned TELNYX LLC 073H MONROE UT
2018-09-11 435-990-8XXX 8000–8999Assigned TELNYX LLC 073H BRIAN HEAD UT
2018-08-27 435-412-4XXX 4000–4999Assigned ONVOY, LLC - UT 871E GLNCNYONCY UT
2018-08-21 435-253-8XXX 8000–8999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 FILLMORE UT
2018-08-20 435-856-9XXX 9000–9999Assigned PEERLESS NETWORK OF UTAH, LLC - UT 526H NEPHI UT
2018-08-16 435-670-0XXX 0000–0999Assigned TELNYX LLC 073H SALINA UT
2018-08-09 435-515-5XXX 5000–5999Assigned FIRSTDIGITAL COMMUNICATIONS, LLC 716D BRIGHAM CY UT
2018-07-31 435-868-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J CEDAR CITY UT
2018-07-03 435-220-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MOAB UT
2018-07-03 435-340-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 EPHRAIM UT
2018-07-03 435-522-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ST GEORGE UT
2018-07-03 435-549-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 VERNAL UT
2018-07-03 435-618-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PANGUITCH UT
2018-06-19 435-466-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BEARRIV CY UT
2018-06-19 435-609-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CASTLEDALE UT
2018-06-18 435-777-2XXX 2000–2999Assigned PEERLESS NETWORK OF UTAH, LLC - UT 526H HEBER CITY UT
2018-06-12 435-704-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 CEDAR CITY UT
2018-05-22 435-579-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 TOOELE UT
2018-05-04 435-299-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 PRICE UT
2018-04-27 435-212-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 HILDALE UT
2018-04-19 435-522-3XXX 3000–3999Assigned ONVOY, LLC - UT 871E ST GEORGE UT
2018-04-19 435-579-6XXX 6000–6999Assigned ONVOY, LLC - UT 871E TOOELE UT
2018-04-18 435-572-2XXX 2000–2999Assigned ONVOY, LLC - UT 871E CEDAR CITY UT
2018-04-18 435-999-2XXX 2000–2999Assigned ONVOY, LLC - UT 871E LOGAN UT
2018-04-12 435-522-0XXX 0000–0999Assigned METROPCS, INC. 5562 ST GEORGE UT
2018-04-11 435-466-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 BEARRIV CY UT
2018-03-14 435-228-7XXX 7000–7999Assigned ONVOY, LLC - UT 871E TOOELE UT
2018-03-14 435-522-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ST GEORGE UT
2018-03-09 435-999-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 LOGAN UT
2018-03-09 435-999-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 LOGAN UT
2018-02-26 435-222-5XXX 5000–5999Assigned ONVOY, LLC - UT 871E HEBER CITY UT
2018-02-22 435-515-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 BRIGHAM CY UT
2018-02-14 435-558-4XXX 4000–4999Assigned PEERLESS NETWORK OF UTAH, LLC - UT 526H RICHFIELD UT
2018-01-29 435-291-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TREMONTON UT
2018-01-29 435-708-0XXX 0000–0999Assigned SOUTH CENTRAL COMM -TELCOM SERVICES, LLC UT 380F CEDAR CITY UT
2018-01-22 435-522-2XXX 2000–2999Assigned QWEST CORPORATION 9636 ST GEORGE UT
2017-12-11 435-485-1XXX 1000–1999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 BLANDING UT
2017-12-05 435-419-9XXX 9000–9999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 MONTICELLO UT
2017-11-30 435-777-1XXX 1000–1999Assigned CENTRAL TELCOM SVCS DBA CENTRACOM INTERACTIVE - NV 791D HEBER CITY UT
2017-11-30 435-777-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 HEBER CITY UT
2017-11-17 435-522-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ST GEORGE UT
2017-11-15 435-777-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 HEBER CITY UT
2017-11-03 435-231-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 ENTERPRISE 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.