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
— 541-441 3XXX4XXX5XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 GRANTSPASS OR
— 541-442 1XXX2XXX4XXX7XXX · 3 holders which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 WASCO OR
— 541-443 not yet reported which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 PILOT ROCK OR
— 541-444 0XXX3XXX5XXX6XXX · 2 holders which blocks → QWEST CORPORATION 9638 SILETZ OR
— 541-445 8XXX which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 CAMAS VLY OR
— 541-446 not yet reported which blocks → OREGON TEL. CORP. 2389 HEREFDUNTY OR
— 541-447 not yet reported which blocks → QWEST CORPORATION 9638 PRINEVILLE OR
— 541-448 not yet reported which blocks → OREGON TEL. CORP. 2389 BATES OR
— 541-449 0XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9638 STANFIELD OR
— 541-450 4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 GRANTSPASS OR
— 541-451 0XXX9XXX · 2 holders which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2395 LEBANON OR
— 541-452 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 CORVALLIS OR
— 541-453 not yet reported which blocks → PIONEER TEL. COOPERATIVE 2393 BLODGETT OR
— 541-454 1XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 ARLINGTON OR
— 541-456 not yet reported which blocks → PIONEER TEL. COOPERATIVE 2393 SUMMIT OR
— 541-457 not yet reported which blocks → HELIX TEL. CO. 2376 HELIX OR
— 541-459 not yet reported which blocks → QWEST CORPORATION 9638 OAKLAND OR
— 541-461 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-462 not yet reported which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 MITCHELL OR
— 541-463 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-464 not yet reported which blocks → QWEST CORPORATION 9638 ROSEBURG OR
— 541-465 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-466 7XXX which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2395 BROWNSVL OR
— 541-467 not yet reported which blocks → NORTH-STATE TEL. CO. 2388 DUFUR OR
— 541-468 5XXX8XXX · 2 holders which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 SPRAY OR
— 541-469 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 BROOKINGS OR
— 541-471 not yet reported which blocks → QWEST CORPORATION 9638 GRANTSPASS OR
— 541-472 not yet reported which blocks → QWEST CORPORATION 9638 GRANTSPASS OR
— 541-473 7XXX which blocks → QWEST CORPORATION 9638 VALE OR
— 541-474 not yet reported which blocks → QWEST CORPORATION 9638 GRANTSPASS OR
— 541-475 not yet reported which blocks → QWEST CORPORATION 9638 MADRAS OR
— 541-476 not yet reported which blocks → QWEST CORPORATION 9638 GRANTSPASS OR
— 541-477 2XXX which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 PAULINA OR
— 541-478 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 MOSIER OR
— 541-479 not yet reported which blocks → QWEST CORPORATION 9638 GRANTSPASS OR
— 541-480 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 BEND OR
— 541-481 not yet reported which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 BOARDMAN OR
— 541-482 not yet reported which blocks → QWEST CORPORATION 9638 ASHLAND OR
— 541-483 not yet reported which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 TYGHVALLEY OR
— 541-484 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-485 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-486 not yet reported which blocks → PIONEER TEL. COOPERATIVE 2393 LOBSTERVLY OR
— 541-487 not yet reported which blocks → PIONEER TEL. COOPERATIVE 2393 ALSEA OR
— 541-488 not yet reported which blocks → QWEST CORPORATION 9638 ASHLAND OR
— 541-489 not yet reported which blocks → TRANS-CASCADES TEL. CO. 2378 ANTELOPE OR
— 541-490 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 HOOD RIVER OR
— 541-491 6XXX7XXX · 2 holders which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 SHEDD OR
— 541-492 not yet reported which blocks → ONVOY, LLC - OR 750E ROSEBURG OR
— 541-493 not yet reported which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 NO HARNEY OR
— 541-494 not yet reported which blocks → BANDWIDTH.COM CLEC, LLC - OR 076F MEDFORD 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.