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
— 541-495 not yet reported which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 SO HARNEY OR
— 541-496 not yet reported which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 GLIDE OR
— 541-497 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 ALBANY OR
— 541-498 1XXX which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 NO UMPQUA OR
— 541-501 none assigned yet which blocks → METROPCS, INC. 5562 EUGENE OR
— 541-504 6XXX which blocks → QWEST CORPORATION 9638 REDMOND OR
— 541-506 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 THE DALLES OR
— 541-510 2XXX3XXX4XXX5XXX6XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 EUGENE OR
— 541-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OR
— 541-512 4XXX5XXX6XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9638 PHOENIX OR
— 541-513 not yet reported which blocks → T-MOBILE USA, INC. 6529 EUGENE OR
— 541-514 5XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 EUGENE OR
— 541-515 4XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 EUGENE OR
— 541-517 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 EUGENE OR
— 541-519 1XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 BAKER OR
— 541-520 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 EUGENE OR
— 541-521 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 EUGENE OR
— 541-522 not yet reported which blocks → HUMBOLDT TELEPHONE COMPANY 3304 QUINN OR
— 541-523 not yet reported which blocks → QWEST CORPORATION 9638 BAKER OR
— 541-524 3XXX4XXX5XXX6XXX · 4 holders which blocks → QWEST CORPORATION 9638 BAKER OR
— 541-528 not yet reported which blocks → PIONEER TEL. COOPERATIVE 2393 TIDEWATER OR
— 541-530 4XXX5XXX8XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 ROSEBURG OR
— 541-531 0–9 XXXall 10 · 3 holders which blocks → UNITED STATES CELLULAR - OR 6349 MEDFORD OR
— 541-533 not yet reported which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 SPRAGUERIV OR
— 541-534 0XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 IMBLER OR
— 541-535 not yet reported which blocks → QWEST CORPORATION 9638 PHOENIX OR
— 541-536 4XXX which blocks → QWEST CORPORATION 9638 LAPINE OR
— 541-538 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → METROPCS, INC. 5562 WHITE CITY OR
— 541-542 6XXX7XXX8XXX · 2 holders which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 SENECA OR
— 541-543 2XXX which blocks → T-MOBILE USA, INC. 6529 EUGENE OR
— 541-544 4XXX7XXX · 2 holders which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 WAMIC OR
— 541-545 not yet reported which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 BONANZA OR
— 541-546 0XXX1XXX4XXX · 2 holders which blocks → QWEST CORPORATION 9638 CULVER OR
— 541-547 not yet reported which blocks → PIONEER TEL. COOPERATIVE 2393 YACHATS OR
— 541-548 not yet reported which blocks → QWEST CORPORATION 9638 REDMOND OR
— 541-549 not yet reported which blocks → QWEST CORPORATION 9638 SISTERS OR
— 541-552 3XXX4XXX · 2 holders which blocks → QWEST CORPORATION 9638 ASHLAND OR
— 541-553 not yet reported which blocks → QWEST CORPORATION 9638 MADRAS OR
— 541-554 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 EUGENE OR
— 541-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST OR
— 541-556 4XXX5XXX6XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 EUGENE OR
— 541-557 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 LINCOLN CY OR
— 541-558 none assigned yet which blocks → QWEST CORPORATION 9638 STATELINE OR
— 541-559 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - OR 750E MYRTLE PT OR
— 541-560 5XXX6XXX7XXX · 3 holders which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 PROSPECT OR
— 541-561 1XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 HERMISTON OR
— 541-562 0XXX2XXX3XXX4XXX7XXX · 5 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 UNION OR
— 541-563 not yet reported which blocks → PIONEER TEL. COOPERATIVE 2393 WALDPORT OR
— 541-564 not yet reported which blocks → QWEST CORPORATION 9638 HERMISTON OR
— 541-565 4XXX6XXX7XXX9XXX · 3 holders which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 MORO 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.