NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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 503
TELEPORT COMMUNICATIONS AMERICA, LLC - OR 34
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
— 503-265 9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 PORTLAND OR
— 503-268 2XXX3XXX7XXX9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 BEAVERTON OR
— 503-270 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 BEAVERTON OR
— 503-308 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 CLATSKANIE OR
— 503-327 1XXX3XXX4XXX5XXX6XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 PORTLAND OR
— 503-372 4XXX6XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 BEAVERTON OR
— 503-382 7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 PORTLAND OR
— 503-383 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 SALEM OR
— 503-385 1XXX3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 SALEM OR
— 503-387 0XXX1XXX3XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 CLACKAMAS OR
— 503-395 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 RAINIER OR
— 503-430 4XXX9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 BEAVERTON OR
— 503-432 0XXX1XXX3XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 PORTLAND OR
— 503-438 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 ST HELENS OR
— 503-447 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 NORTH PL OR
— 503-451 0XXX1XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 CLACKAMAS OR
— 503-454 6XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 STFRD-SNDY OR
— 503-462 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 CLACKAMAS OR
— 503-484 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 PORTLAND OR
— 503-495 not yet reported which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 BEAVERTON OR
— 503-498 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 STFRD-SNDY OR
— 503-506 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 STFRD-SNDY OR
— 503-530 0XXX6XXX9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 BEAVERTON OR
— 503-535 9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 PORTLAND OR
— 503-676 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 GRESHAM OR
— 503-683 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 CLACKAMAS OR
— 503-686 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 BEAVERTON 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
— 503-765 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
— 503-825 0XXX2XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 SHERWOOD OR
— 503-889 0XXX6XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 PORTLAND OR
— 503-946 1XXX3XXX5XXX6XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 PORTLAND OR

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.