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
— 541-365 not yet reported which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 CHEMULT OR
— 541-367 not yet reported which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2395 SWEET HOME OR
— 541-369 not yet reported which blocks → ROOME TELECOMMUNICATIONS, INC. 2375 HALSEY OR
— 541-372 6XXX which blocks → QWEST CORPORATION 9638 NYSSA OR
— 541-374 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 CASCADELKS OR
— 541-376 2XXX3XXX4XXX6XXX7XXX9XXX · 4 holders which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 ECHO OR
— 541-377 none assigned yet which blocks → UNITED STATES CELLULAR - OR 6349 PENDLETON OR
— 541-378 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 ROSEBURG OR
— 541-379 none assigned yet which blocks → UNITED STATES CELLULAR - OR 6349 PENDLETON OR
— 541-380 2XXX3XXX7XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 HOOD RIVER OR
— 541-381 3XXX which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 FT KLAMATH OR
— 541-382 not yet reported which blocks → QWEST CORPORATION 9638 BEND OR
— 541-383 not yet reported which blocks → QWEST CORPORATION 9638 BEND OR
— 541-384 not yet reported which blocks → HOME TEL. CO. 2377 CONDON OR
— 541-385 not yet reported which blocks → QWEST CORPORATION 9638 BEND OR
— 541-386 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 HOOD RIVER OR
— 541-387 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 HOOD RIVER OR
— 541-388 not yet reported which blocks → QWEST CORPORATION 9638 BEND OR
— 541-389 not yet reported which blocks → QWEST CORPORATION 9638 BEND OR
— 541-390 2XXX which blocks → T-MOBILE USA, INC. 6529 BEND OR
— 541-391 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 ROSEBURG OR
— 541-393 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 EUGENE OR
— 541-395 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 MAUPIN OR
— 541-396 0XXX8XXX9XXX · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 COQUILLE OR
— 541-400 1XXX2XXX4XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 HOOD RIVER OR
— 541-401 6XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 LEBANON OR
— 541-405 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 LEBANON OR
— 541-408 9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 BEND OR
— 541-409 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LEBANON OR
— 541-410 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 BEND OR
— 541-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OR
— 541-412 5XXX6XXX which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 BROOKINGS OR
— 541-416 not yet reported which blocks → QWEST CORPORATION 9638 PRINEVILLE OR
— 541-419 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 BEND OR
— 541-420 none assigned yet which blocks → UNITED STATES CELLULAR - OR 6349 BEND OR
— 541-421 not yet reported which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 LONG CREEK OR
— 541-422 2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 IONE OR
— 541-424 not yet reported which blocks → PIONEER TEL. COOPERATIVE 2393 BELLFONTAN OR
— 541-426 1XXX7XXX · 2 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 ENTERPRISE OR
— 541-427 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 UKIAH OR
— 541-428 not yet reported which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 PILOT ROCK OR
— 541-430 none assigned yet which blocks → UNITED STATES CELLULAR - OR 6349 ROSEBURG OR
— 541-431 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-432 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 JOSEPH OR
— 541-433 not yet reported which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 GILCHRIST OR
— 541-434 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-436 0–9 XXXall 10 · 6 holders which blocks → AXXIS COMMUNICATION, INC. - OR 9231 HOOD RIVER OR
— 541-438 not yet reported which blocks → PIONEER TEL. COOPERATIVE 2393 HARLAN OR
— 541-439 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 POWERS OR
— 541-440 not yet reported which blocks → QWEST CORPORATION 9638 ROSEBURG 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.