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
— 503-756 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-757 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-759 not yet reported which blocks → MOLALLA TEL. CO. 2383 MOLALLA OR
— 503-760 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-761 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-762 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-763 not yet reported which blocks → QWEST CORPORATION 9638 SALEM OR
— 503-765 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 CLACKAMAS OR
— 503-766 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 GRESHAM OR
— 503-767 not yet reported which blocks → STAYTON COOP. TEL. CO. 2399 STAYTON OR
— 503-768 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-769 not yet reported which blocks → STAYTON COOP. TEL. CO. 2399 STAYTON OR
— 503-770 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 TELECOM OF OREGON, LLC - OR 7537 CHARBONNEU OR
— 503-771 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-772 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-773 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 TELECOM OF OREGON, LLC - OR 7537 NORTH PL OR
— 503-774 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-775 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-776 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 TELECOM OF OREGON, LLC - OR 7537 AURORA OR
— 503-777 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-778 none assigned yet which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-779 3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 SALEM OR
— 503-780 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PORTLAND OR
— 503-781 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PORTLAND OR
— 503-783 3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 STFRD-SNDY OR
— 503-784 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PORTLAND OR
— 503-785 3XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9638 CLACKAMAS OR
— 503-786 not yet reported which blocks → QWEST CORPORATION 9638 CLACKAMAS OR
— 503-787 7XXX which blocks → QWEST CORPORATION 9638 FALLS CITY OR
— 503-788 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-789 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PORTLAND OR
— 503-790 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-791 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ASTORIA OR
— 503-792 not yet reported which blocks → GERVAIS TEL. CO. 2373 GERVAIS OR
— 503-793 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-794 not yet reported which blocks → QWEST CORPORATION 9638 CLACKAMAS OR
— 503-795 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-796 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-797 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-798 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 SALEM OR
— 503-799 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PORTLAND OR
— 503-801 6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TILLAMOOK OR
— 503-802 not yet reported which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 PORTLAND OR
— 503-803 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PORTLAND OR
— 503-804 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PORTLAND OR
— 503-805 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PORTLAND OR
— 503-806 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PORTLAND OR
— 503-807 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PORTLAND OR
— 503-808 0XXX7XXX8XXX9XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 PORTLAND OR
— 503-809 0XXX2XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 NORTH PL 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.