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
— 801-436 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7176 OGDEN UT
— 801-437 none assigned yet which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7176 PROVO UT
— 801-438 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7176 MIDVALE UT
— 801-439 0–9 XXXwhole prefix which blocks → FIRSTDIGITAL TELECOM, LLC - UT 5727 MIDVALE UT
— 801-440 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
— 801-442 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-443 2XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PLEASATGRV UT
— 801-444 not yet reported which blocks → QWEST CORPORATION 9636 KAYSVILLE UT
— 801-445 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-446 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-447 0XXX1XXX2XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9636 FARMINGTON UT
— 801-449 0–9 XXXall 10 · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7176 MIDVALE UT
— 801-450 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
— 801-451 not yet reported which blocks → QWEST CORPORATION 9636 FARMINGTON UT
— 801-452 1XXX3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-453 5XXX which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-455 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
— 801-457 not yet reported which blocks → ONVOY, LLC - UT 871E OGDEN UT
— 801-458 not yet reported which blocks → T-MOBILE USA, INC. 6529 OGDEN UT
— 801-459 not yet reported which blocks → ONVOY, LLC - UT 871E OGDEN UT
— 801-461 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-462 0–9 XXXall 10 · 4 holders which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-463 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-464 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-465 not yet reported which blocks → QWEST CORPORATION 9636 PAYSON UT
— 801-466 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-467 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-468 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-469 not yet reported which blocks → ONVOY, LLC - UT 871E OGDEN UT
— 801-470 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-471 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 PROVO UT
— 801-472 0XXX1XXX2XXX3XXX5XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 PROVO UT
— 801-473 0XXX1XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 PROVO UT
— 801-474 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-475 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-476 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-478 not yet reported which blocks → PAETEC ITEL, LLC 829J SALT LAKE UT
— 801-479 not yet reported which blocks → QWEST CORPORATION 9636 OGDEN UT
— 801-480 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-481 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-482 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-483 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-484 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-485 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-486 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-487 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-488 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-489 not yet reported which blocks → QWEST CORPORATION 9636 SPRINGVL UT
— 801-490 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-491 not yet reported which blocks → QWEST CORPORATION 9636 SPRINGVL 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.