NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 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, all time — NPA 801
QWEST CORPORATION 327
T-MOBILE USA, INC. 91
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 69
NEW CINGULAR WIRELESS PCS, LLC 62
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 50
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
— 801-805 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PROVO UT
— 801-806 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SPRINGVL UT
— 801-807 3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 KAYSVILLE UT
— 801-808 not yet reported which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-809 not yet reported which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX UT
— 801-812 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-813 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → ONVOY, LLC - UT 871E BOUNTIFUL UT
— 801-814 not yet reported which blocks → T-MOBILE USA, INC. 6529 OGDEN UT
— 801-815 not yet reported which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-816 6XXX7XXX which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-817 not yet reported which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - UT 7530 SALT LAKE UT
— 801-818 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-820 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - UT 7530 CLEARFIELD UT
— 801-821 2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 MORGAN UT
— 801-823 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - UT 871E OGDEN UT
— 801-825 not yet reported which blocks → QWEST CORPORATION 9636 CLEARFIELD UT
— 801-828 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → AT&T - LOCAL 7421 SALT LAKE UT
— 801-829 1XXX7XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9636 MORGAN UT
— 801-831 1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-832 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-835 0XXX1XXX2XXX which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-838 8XXX which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7176 MIDVALE UT
— 801-840 3XXX6XXX7XXX which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-841 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PROVO UT
— 801-842 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → XO UTAH, INC. 7541 SALT LAKE UT
— 801-843 0–9 XXXwhole prefix which blocks → ONVOY, LLC - UT 871E OGDEN UT
— 801-844 1XXX which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-845 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9636 MORGAN UT
— 801-847 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 AMERCNFORK UT
— 801-848 0–9 XXXwhole prefix which blocks → FIRSTDIGITAL TELECOM, LLC - UT 5727 MIDVALE UT
— 801-849 3XXX4XXX5XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - UT 7530 MIDVALE UT
— 801-851 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PROVO UT
— 801-852 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PROVO UT
— 801-853 1XXX2XXX3XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SPRINGVL UT
— 801-856 not yet reported which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-858 1XXX which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7176 MIDVALE UT
— 801-859 not yet reported which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-860 not yet reported which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-861 not yet reported which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - UT 7530 PROVO UT
— 801-862 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-864 not yet reported which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-865 0XXX1XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-866 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7176 OGDEN UT
— 801-867 not yet reported which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-868 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-870 5XXX6XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
— 801-873 not yet reported which blocks → CENTRAL UTAH TEL., INC. 2277 SPNSFKCNYN UT
— 801-876 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9636 MORGAN UT
— 801-877 0–9 XXXwhole prefix which blocks → ONVOY, LLC - UT 871E PROVO 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.