NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

5 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, last 30 days — NPA 435
UINTAH BASIN ELECTRONIC TELECOMMUNICATIONS 4
TDS BROADBAND SERVICE 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 NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 435-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX UT
— 435-813 1XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 MANTI UT
— 435-819 1XXX3XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 KANAB UT
— 435-820 3XXX5XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PRICE UT
— 435-822 not yet reported which blocks → UINTAH BASIN ELECTRONIC TELECOMMUNICATIONS 1772 DUCHESNE UT
— 435-823 not yet reported which blocks → UINTAH BASIN ELECTRONIC TELECOMMUNICATIONS 1772 ROOSEVELT UT
— 435-826 not yet reported which blocks → SOUTH CENTRAL UTAH TEL. ASSN., INC. 2286 ESCALANTE UT
— 435-827 not yet reported which blocks → ALBION TELEPHONE CO. DBA ATC COMMUNICATIONS 2213 ALMO UT
— 435-828 not yet reported which blocks → UINTAH BASIN ELECTRONIC TELECOMMUNICATIONS 1772 VERNAL UT
— 435-830 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TOOELE UT
— 435-831 not yet reported which blocks → SKYLINE TELECOM 2283 DUGWAY UT
— 435-833 not yet reported which blocks → QWEST CORPORATION 9636 TOOELE UT
— 435-834 not yet reported which blocks → SOUTH CENTRAL UTAH TEL. ASSN., INC. 2286 BRYCECNYON UT
— 435-835 not yet reported which blocks → MANTI TEL. CO. 2282 MANTI UT
— 435-836 not yet reported which blocks → SOUTH CENTRAL UTAH TEL. ASSN., INC. 2286 LOA UT
— 435-837 not yet reported which blocks → BEEHIVE TELEPHONE COMPANY, INC. (UTAH) 4611 RUSHVALLEY UT
— 435-839 not yet reported which blocks → BEEHIVE TELEPHONE COMPANY, INC. (UTAH) 4611 VERNON UT
— 435-840 6XXX7XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 TOOELE UT
— 435-841 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 TOOELE UT
— 435-842 not yet reported which blocks → CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 4429 MEADOW UT
— 435-843 not yet reported which blocks → QWEST CORPORATION 9636 TOOELE UT
— 435-846 not yet reported which blocks → CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 4429 OAK CITY UT
— 435-848 not yet reported which blocks → UBTA-UBET COMMUNICATIONS, INC. DBA STRATA NETWORKS 2287 TABIONA UT
— 435-849 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TOOELE UT
— 435-850 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 TOOELE UT
— 435-851 5XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 MANTI UT
— 435-854 none assigned yet which blocks → CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 4429 THATCHER UT
— 435-855 not yet reported which blocks → BEEHIVE TELEPHONE COMPANY, INC. (UTAH) 4611 GARRISON UT
— 435-857 not yet reported which blocks → CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 4429 LYNNDYL UT
— 435-863 not yet reported which blocks → CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 4429 PROMONTORY UT
— 435-864 none assigned yet which blocks → CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 4429 DELTA UT
— 435-865 not yet reported which blocks → QWEST CORPORATION 9636 CEDAR CITY UT
— 435-866 6XXX7XXX8XXX · 2 holders which blocks → CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 4429 PORTAGE UT
— 435-867 not yet reported which blocks → QWEST CORPORATION 9636 CEDAR CITY UT
— 435-870 not yet reported which blocks → CENTRAL UTAH TEL., INC. 2277 SOLDER SMT UT
— 435-871 not yet reported which blocks → BEEHIVE TELEPHONE COMPANY, INC. (UTAH) 4611 PARKVALLEY UT
— 435-872 none assigned yet which blocks → CITIZENS TELECOM-UTAH DBA FRONTIER COMM OF UT 4429 SNOWVILLE UT
— 435-874 4XXX which blocks → SOUTH CENTRAL UTAH TEL. ASSN., INC. 2286 HILDALE UT
— 435-877 not yet reported which blocks → SOUTH CENTRAL UTAH TEL. ASSN., INC. 2286 APPLE VLLY UT
— 435-878 not yet reported which blocks → SOUTH CENTRAL UTAH TEL. ASSN., INC. 2286 ENTERPRISE UT
— 435-879 1XXX3XXX5XXX7XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9636 ST GEORGE UT
— 435-880 not yet reported which blocks → UNION TELEPHONE COMPANY 013B DUTCH JOHN UT
— 435-881 8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LOGAN UT
— 435-882 not yet reported which blocks → QWEST CORPORATION 9636 TOOELE UT
— 435-884 2XXX7XXX which blocks → QWEST CORPORATION 9636 TOOELE UT
— 435-885 not yet reported which blocks → UNION TEL. CO. 2297 DUTCH JOHN UT
— 435-888 not yet reported which blocks → CARBON/EMERY TELCOM, INC. - UT 1190 PRICE UT
— 435-889 not yet reported which blocks → UNION TEL. CO. 2297 GREENDALE UT
— 435-890 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 LOGAN UT
— 435-893 3XXX5XXX6XXX7XXX · 4 holders which blocks → QWEST CORPORATION 9636 RICHFIELD UT

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.