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
— 801-547 none assigned yet which blocks → QWEST CORPORATION 9636 KAYSVILLE UT
— 801-549 none assigned yet which blocks → QWEST CORPORATION 9636 KAYSVILLE UT
— 801-550 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SALT LAKE UT
— 801-551 not yet reported which blocks → QWEST CORPORATION 9636 PROVO UT
— 801-552 not yet reported which blocks → QWEST CORPORATION 9636 KAYSVILLE UT
— 801-553 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-554 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SALT LAKE UT
— 801-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST UT
— 801-556 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SALT LAKE UT
— 801-557 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SALT LAKE UT
— 801-558 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SALT LAKE UT
— 801-559 0–9 XXXall 10 · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MIDVALE UT
— 801-560 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SALT LAKE UT
— 801-561 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-562 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-563 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-564 4XXX6XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 OGDEN UT
— 801-565 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-566 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-567 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-568 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-569 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-570 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-571 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-572 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-573 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
— 801-574 0XXX1XXX2XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
— 801-575 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-576 not yet reported which blocks → QWEST CORPORATION 9636 MIDVALE UT
— 801-578 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-579 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-580 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SALT LAKE UT
— 801-581 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-582 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-583 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-584 9XXX which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-585 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-586 not yet reported which blocks → QWEST CORPORATION 9636 CLEARFIELD UT
— 801-587 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-588 9XXX which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-589 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 KAYSVILLE UT
— 801-590 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → AT&T - LOCAL 7421 MURRAY UT
— 801-591 not yet reported which blocks → QWEST CORPORATION 9636 KAYSVILLE UT
— 801-592 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 PROVO UT
— 801-593 not yet reported which blocks → QWEST CORPORATION 9636 KAYSVILLE UT
— 801-594 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-595 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-596 not yet reported which blocks → QWEST CORPORATION 9636 SALT LAKE UT
— 801-597 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
— 801-598 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 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.