NumberResearch Membership · Data 09/30/2026

Recent prefix assignments

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

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, last 30 days
Rogers Communications Canada Inc. (Wireless) 46
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
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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Quick find in this area code:
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 541-589 5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 BURNS OR
— 541-591 7XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 KLAMATHFLS OR
— 541-592 1XXX7XXX · 2 holders which blocks → ZIPLY FIBER OREGON, LLC DBA ZIPLY FIBER 3401 CAVE JCT OR
— 541-593 not yet reported which blocks → QWEST CORPORATION 9638 BEND OR
— 541-594 4XXX7XXX · 2 holders which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 CRATERLAKE OR
— 541-595 3XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9638 BLACKBUTTE OR
— 541-596 1XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → ZIPLY FIBER OREGON, LLC DBA ZIPLY FIBER 3401 O BRIEN OR
— 541-597 3XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → ZIPLY FIBER OREGON, LLC DBA ZIPLY FIBER 3401 SELMA OR
— 541-598 3XXX4XXX5XXX6XXX · 2 holders which blocks → QWEST CORPORATION 9638 BEND OR
— 541-599 not yet reported which blocks → CASCADE UTILITIES, INC. 2371 ASH VALLEY OR
— 541-601 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MEDFORD OR
— 541-602 7XXX8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CORVALLIS OR
— 541-604 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 REDMOND OR
— 541-607 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-608 not yet reported which blocks → QWEST CORPORATION 9638 MEDFORD OR
— 541-609 2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 PHILOMATH OR
— 541-610 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 BEND OR
— 541-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OR
— 541-612 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 PENDLETON OR
— 541-617 not yet reported which blocks → QWEST CORPORATION 9638 BEND OR
— 541-618 not yet reported which blocks → QWEST CORPORATION 9638 MEDFORD OR
— 541-619 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 ALBANY OR
— 541-620 3XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 JOHN DAY OR
— 541-621 none assigned yet which blocks → UNITED STATES CELLULAR - OR 6349 MEDFORD OR
— 541-622 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K MEDFORD OR
— 541-623 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - OR 750E COTTAGEGRV OR
— 541-643 none assigned yet which blocks → UNITED STATES CELLULAR - OR 6349 ROSEBURG OR
— 541-644 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ELTOPIA COMMUNICATIONS LLC - OR 647F HARRISBURG OR
— 541-648 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 SILETZ OR
— 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

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/30/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.