NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 541
QWEST CORPORATION 184
ONVOY, LLC - OR 70
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 69
T-MOBILE USA, INC. 54
CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 53
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
— 541-650 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 EUGENE OR
— 541-657 0XXX7XXX8XXX9XXX · 3 holders which blocks → TERRA NOVA TELECOM INC. 145J BROWNSVL OR
— 541-659 none assigned yet which blocks → UNITED STATES CELLULAR - OR 6349 GRANTSPASS OR
— 541-660 none assigned yet which blocks → UNITED STATES CELLULAR - OR 6349 GRANTSPASS OR
— 541-663 4XXX5XXX6XXX7XXX · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 LA GRANDE OR
— 541-664 not yet reported which blocks → QWEST CORPORATION 9638 CENTRAL PT OR
— 541-665 8XXX which blocks → QWEST CORPORATION 9638 CENTRAL PT OR
— 541-667 0XXX1XXX4XXX7XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9638 HERMISTON OR
— 541-669 0XXX1XXX4XXX6XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - OR 750E LINCOLN CY OR
— 541-670 2XXX3XXX4XXX5XXX6XXX7XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 ROSEBURG OR
— 541-671 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 ROSEBURG OR
— 541-672 not yet reported which blocks → QWEST CORPORATION 9638 ROSEBURG OR
— 541-673 not yet reported which blocks → QWEST CORPORATION 9638 ROSEBURG OR
— 541-676 not yet reported which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 HEPPNER OR
— 541-677 not yet reported which blocks → QWEST CORPORATION 9638 ROSEBURG OR
— 541-679 not yet reported which blocks → QWEST CORPORATION 9638 ROSEBURG OR
— 541-680 none assigned yet which blocks → METROPCS, INC. 5562 ROSEBURG OR
— 541-681 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-682 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-683 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-684 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-685 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-686 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-687 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-688 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-689 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-690 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 MEDFORD OR
— 541-691 not yet reported which blocks → ONVOY, LLC - OR 750E CANYONVL OR
— 541-693 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 BEND OR
— 541-700 not yet reported which blocks → OR
— 541-702 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 JACKSONVL OR
— 541-704 0XXX5XXX7XXX8XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 ALBANY OR
— 541-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OR
— 541-713 not yet reported which blocks → QWEST CORPORATION 9638 CORVALLIS OR
— 541-714 0XXX1XXX2XXX3XXX5XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9638 CORVALLIS OR
— 541-715 not yet reported which blocks → QWEST CORPORATION 9638 CORVALLIS OR
— 541-720 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 HERMISTON OR
— 541-723 1XXX which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 MALIN OR
— 541-724 not yet reported which blocks → OREGON-IDAHO UTILITIES, INC. 2390 ADRIAN OR
— 541-726 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-729 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 EUGENE OR
— 541-730 3XXX4XXX8XXX · 3 holders which blocks → METROPCS, INC. 5562 ALBANY OR
— 541-731 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 EUGENE OR
— 541-732 not yet reported which blocks → QWEST CORPORATION 9638 MEDFORD OR
— 541-733 2XXX3XXX4XXX · 2 holders which blocks → UNITED STATES CELLULAR - OR 6349 ROSEBURG OR
— 541-734 not yet reported which blocks → QWEST CORPORATION 9638 MEDFORD OR
— 541-736 6XXX which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-737 not yet reported which blocks → QWEST CORPORATION 9638 CORVALLIS OR
— 541-738 not yet reported which blocks → QWEST CORPORATION 9638 CORVALLIS OR
— 541-739 7XXX which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 RUFUS OR

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.