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
— 503-320 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 PORTLAND OR
— 503-321 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-322 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 GARIBALDI OR
— 503-323 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-324 not yet reported which blocks → ZIPLY FIBER PACIFIC, LLC DBA ZIPLY FIBER 517K BEAVERTON OR
— 503-325 not yet reported which blocks → QWEST CORPORATION 9638 ASTORIA OR
— 503-326 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-327 1XXX3XXX4XXX5XXX6XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 PORTLAND OR
— 503-328 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 GRESHAM OR
— 503-329 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PORTLAND OR
— 503-330 none assigned yet which blocks → METROPCS, INC. 5562 BEAVERTON OR
— 503-331 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-332 none assigned yet which blocks → METROPCS, INC. 5562 BEAVERTON OR
— 503-334 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-335 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-337 not yet reported which blocks → CASCADE UTILITIES, INC. 2371 ESTACADA OR
— 503-338 none assigned yet which blocks → QWEST CORPORATION 9638 ASTORIA OR
— 503-339 4XXX5XXX6XXX7XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 SALEM OR
— 503-340 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-341 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 PORTLAND OR
— 503-342 2XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 CLACKAMAS OR
— 503-343 0XXX1XXX2XXX4XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 CLACKAMAS OR
— 503-344 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 CLACKAMAS OR
— 503-345 none assigned yet which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 PORTLAND OR
— 503-346 not yet reported which blocks → QWEST CORPORATION 9638 PORTLAND OR
— 503-347 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 PORTLAND OR
— 503-348 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 PORTLAND OR
— 503-349 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 PORTLAND OR
— 503-350 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 BEAVERTON OR
— 503-351 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 PORTLAND OR
— 503-352 4XXX5XXX9XXX which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 BEAVERTON OR
— 503-353 not yet reported which blocks → QWEST CORPORATION 9638 CLACKAMAS OR
— 503-355 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 ROCKAWAY OR
— 503-356 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 BEAVERTON OR
— 503-357 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 BEAVERTON OR
— 503-358 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PORTLAND OR
— 503-359 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 BEAVERTON OR
— 503-361 not yet reported which blocks → QWEST CORPORATION 9638 SALEM OR
— 503-362 not yet reported which blocks → QWEST CORPORATION 9638 SALEM OR
— 503-363 not yet reported which blocks → QWEST CORPORATION 9638 SALEM OR
— 503-364 not yet reported which blocks → QWEST CORPORATION 9638 SALEM OR
— 503-365 not yet reported which blocks → QWEST CORPORATION 9638 SALEM OR
— 503-366 not yet reported which blocks → QWEST CORPORATION 9638 ST HELENS OR
— 503-368 not yet reported which blocks → NEHALEM TELECOMMS, INC. DBA NEHALEM TEL & TEL 2387 NEHALEM OR
— 503-369 5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ST HELENS OR
— 503-370 not yet reported which blocks → QWEST CORPORATION 9638 SALEM OR
— 503-371 not yet reported which blocks → QWEST CORPORATION 9638 SALEM OR
— 503-372 4XXX6XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 BEAVERTON OR
— 503-373 not yet reported which blocks → QWEST CORPORATION 9638 SALEM OR
— 503-375 not yet reported which blocks → QWEST CORPORATION 9638 SALEM 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.