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
— 801-492 5XXX which blocks → QWEST CORPORATION 9636 AMERCNFORK UT
— 801-493 5XXX9XXX which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-494 3XXX4XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PROVO UT
— 801-495 4XXX5XXX which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-496 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-497 none assigned yet which blocks → QWEST CORPORATION 9636 KAYSVILLE UT
— 801-498 0XXX which blocks → QWEST CORPORATION 9636 KAYSVILLE UT
— 801-499 1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 KAYSVILLE UT
— 801-501 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-502 0XXX1XXX2XXX which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-504 6XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - UT 7530 SPANIHFORK UT
— 801-506 3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7176 MURRAY UT
— 801-507 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → QWEST CORPORATION 9636 MURRAY UT
— 801-508 2XXX3XXX4XXX5XXX6XXX · 2 holders which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-509 5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 MURRAY UT
— 801-510 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KAYSVILLE UT
— 801-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX UT
— 801-514 7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 MURRAY UT
— 801-515 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J SPRINGVL UT
— 801-516 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - UT 871E MORGAN UT
— 801-517 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-518 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
— 801-519 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-520 1XXX3XXX4XXX5XXX6XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
— 801-521 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-522 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-523 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-524 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-525 not yet reported which blocks → QWEST CORPORATION 9636 CLEARFIELD UT
— 801-526 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-527 0XXX1XXX7XXX8XXX9XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MIDVALE UT
— 801-528 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → XO UTAH, INC. 7541 OGDEN UT
— 801-529 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 KAYSVILLE UT
— 801-530 9XXX which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-531 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-532 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-533 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-534 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-535 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-536 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-537 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-538 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-539 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-540 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KAYSVILLE UT
— 801-541 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SALT LAKE UT
— 801-542 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - UT 3231 MIDVALE UT
— 801-543 none assigned yet which blocks → QWEST CORPORATION 9636 KAYSVILLE UT
— 801-544 not yet reported which blocks → QWEST CORPORATION 9636 KAYSVILLE UT
— 801-545 4XXX7XXX which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-546 not yet reported which blocks → QWEST CORPORATION 9636 KAYSVILLE 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.