NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

1 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, last 30 days — NPA 503
ONVOY, LLC - OR 1
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
— 503-703 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PORTLAND OR
— 503-704 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PORTLAND OR
— 503-705 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PORTLAND OR
— 503-706 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PORTLAND OR
— 503-707 0XXX1XXX2XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BEAVERTON OR
— 503-708 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PORTLAND OR
— 503-709 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PORTLAND OR
— 503-710 2XXX3XXX4XXX5XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 WOODBURN OR
— 503-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OR
— 503-712 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BEAVERTON OR
— 503-713 1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 BEAVERTON OR
— 503-714 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - OR 076F DAYTON OR
— 503-715 4XXX5XXX6XXX7XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 PORTLAND OR
— 503-716 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BEAVERTON OR
— 503-717 5XXX6XXX · 2 holders which blocks → QWEST CORPORATION 9638 SEASIDE OR
— 503-718 1XXX3XXX4XXX7XXX8XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 BEAVERTON OR
— 503-720 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PORTLAND OR
— 503-721 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-722 not yet reported which blocks → QWEST CORPORATION 9638 CLACKAMAS OR
— 503-723 not yet reported which blocks → QWEST CORPORATION 9638 CLACKAMAS OR
— 503-725 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-726 6XXX8XXX9XXX which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 BEAVERTON OR
— 503-727 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-728 5XXX6XXX8XXX · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 CLATSKANIE OR
— 503-730 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 PORTLAND OR
— 503-731 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-732 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 TELECOM OF OREGON, LLC - OR 7537 BEAVER CRK OR
— 503-733 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-734 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 TELECOM OF OREGON, LLC - OR 7537 PORTLAND OR
— 503-735 5XXX which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-736 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-737 4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-738 1XXX which blocks → QWEST CORPORATION 9638 SEASIDE OR
— 503-739 4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEASIDE OR
— 503-740 not yet reported which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-741 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 ASTORIA OR
— 503-742 3XXX which blocks → QWEST CORPORATION 9638 CLACKAMAS OR
— 503-743 0XXX1XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 AUMSVLTRNR OR
— 503-744 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → ONVOY, LLC - OR 750E CLACKAMAS OR
— 503-745 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PORTLAND OR
— 503-746 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 BEAVERTON OR
— 503-747 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 BEAVERTON OR
— 503-748 9XXX which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 BEAVERTON OR
— 503-749 0XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 AUMSVLTRNR OR
— 503-750 not yet reported which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-751 1XXX2XXX3XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9638 DALLAS OR
— 503-752 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-753 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-754 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-755 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 JEWELL 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.