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
— 541-566 4XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9638 ATHENA OR
— 541-567 not yet reported which blocks → QWEST CORPORATION 9638 HERMISTON OR
— 541-568 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 COVE OR
— 541-569 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 LOSTINE OR
— 541-570 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 LEBANON OR
— 541-571 none assigned yet which blocks → UNITED STATES CELLULAR - OR 6349 HERMISTON OR
— 541-572 6XXX7XXX8XXX9XXX · 4 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 MYRTLE PT OR
— 541-573 9XXX which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 BURNS OR
— 541-574 not yet reported which blocks → QWEST CORPORATION 9638 NEWPORT OR
— 541-575 not yet reported which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 JOHN DAY OR
— 541-576 0XXX1XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 SILVERLAKE OR
— 541-577 0XXX1XXX2XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 JOSEPH OR
— 541-578 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 MOSIER OR
— 541-579 2XXX8XXX which blocks → T-MOBILE USA, INC. 6529 EUGENE OR
— 541-580 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ROSEBURG OR
— 541-582 7XXX which blocks → QWEST CORPORATION 9638 ROGUERIVER OR
— 541-584 not yet reported which blocks → CASCADE UTILITIES, INC. 2371 ELKTON OR
— 541-585 not yet reported which blocks → ONVOY, LLC - OR 750E BEND OR
— 541-586 not yet reported which blocks → OREGON-IDAHO UTILITIES, INC. 2390 JORDAN VLY OR
— 541-587 not yet reported which blocks → CASCADE UTILITIES, INC. 2371 SCOTTSBURG OR
— 541-588 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9638 SISTERS OR
— 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

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.