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
— 801-599 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
— 801-601 1XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - UT 7530 MIDVALE UT
— 801-602 0XXX1XXX2XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 PROVO UT
— 801-603 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 OGDEN UT
— 801-604 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SALT LAKE UT
— 801-605 none assigned yet which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - UT 7530 OGDEN UT
— 801-606 not yet reported which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - UT 7530 SALT LAKE UT
— 801-607 none assigned yet which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - UT 7530 PROVO UT
— 801-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX UT
— 801-612 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-613 0–9 XXXall 10 · 5 holders which blocks → FIRSTDIGITAL COMMUNICATIONS, LLC 716D MIDVALE UT
— 801-614 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9636 CLEARFIELD UT
— 801-617 0XXX1XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MIDVALE UT
— 801-618 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
— 801-619 5XXX which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-620 0XXX which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-621 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-622 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-624 0XXX6XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-625 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-626 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-627 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-629 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-631 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
— 801-632 not yet reported which blocks → QWEST CORPORATION 9636 KAYSVILLE UT
— 801-633 2XXX3XXX4XXX5XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
— 801-634 0XXX1XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-635 1XXX which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-636 4XXX which blocks → T-MOBILE USA, INC. 6529 PROVO UT
— 801-639 0XXX1XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9636 MURRAY UT
— 801-640 not yet reported which blocks → ONVOY, LLC - UT 871E OGDEN UT
— 801-641 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
— 801-642 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7176 AMERCNFORK UT
— 801-644 not yet reported which blocks → T-MOBILE USA, INC. 6529 OGDEN UT
— 801-645 not yet reported which blocks → T-MOBILE USA, INC. 6529 OGDEN UT
— 801-646 not yet reported which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J SALT LAKE UT
— 801-648 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 OGDEN UT
— 801-649 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SALT LAKE UT
— 801-650 not yet reported which blocks → ONVOY, LLC - UT 871E OGDEN UT
— 801-651 4XXX which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-652 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SALT LAKE UT
— 801-655 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7176 PROVO UT
— 801-656 5XXX7XXX8XXX9XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SALT LAKE UT
— 801-659 not yet reported which blocks → ONVOY, LLC - UT 871E OGDEN UT
— 801-661 6XXX which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-667 not yet reported which blocks → SKYLINE TELECOM 2283 GOSHEN UT
— 801-668 not yet reported which blocks → T-MOBILE USA, INC. 6529 OGDEN UT
— 801-670 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-671 not yet reported which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-673 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SALT LAKE 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.