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
— 541-220 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 ALBANY OR
— 541-221 4XXX5XXX6XXX7XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 EUGENE OR
— 541-223 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 ALBANY OR
— 541-224 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 CORVALLIS OR
— 541-225 4XXX5XXX7XXX8XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 EUGENE OR
— 541-226 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 GRANTSPASS OR
— 541-227 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MEDFORD OR
— 541-229 not yet reported which blocks → ONVOY, LLC - OR 750E ROSEBURG OR
— 541-230 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 CORVALLIS OR
— 541-231 4XXX5XXX6XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 CORVALLIS OR
— 541-232 none assigned yet which blocks → T-MOBILE USA, INC. 6529 EUGENE OR
— 541-233 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 PRINEVILLE OR
— 541-234 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 JUNCTIONCY OR
— 541-235 not yet reported which blocks → FARMERS MUTUAL TELEPHONE COMPANY - OR 782H ONTARIO OR
— 541-236 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 ROSEBURG OR
— 541-237 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - OR 076F GRANTSPASS OR
— 541-240 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → UNITED STATES CELLULAR - OR 6349 PENDLETON OR
— 541-242 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-243 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 CORVALLIS OR
— 541-245 not yet reported which blocks → QWEST CORPORATION 9638 MEDFORD OR
— 541-246 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 EUGENE OR
— 541-247 1XXX which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 GOLD BEACH OR
— 541-248 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 ALBANY OR
— 541-250 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 CORVALLIS OR
— 541-251 5XXX7XXX8XXX9XXX · 4 holders which blocks → UNITED STATES CELLULAR - OR 6349 BROOKINGS OR
— 541-255 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 EUGENE OR
— 541-257 0XXX1XXX5XXX7XXX8XXX · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 CORVALLIS OR
— 541-258 9XXX which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2395 LEBANON OR
— 541-259 9XXX which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2395 LEBANON OR
— 541-260 5XXX6XXX7XXX8XXX9XXX which blocks → UNITED STATES CELLULAR - OR 6349 COOS BAY OR
— 541-261 6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MEDFORD OR
— 541-262 0XXX1XXX2XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → QWEST CORPORATION 9638 OREGONSLOP OR
— 541-265 not yet reported which blocks → QWEST CORPORATION 9638 NEWPORT OR
— 541-266 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 COOS BAY OR
— 541-267 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 COOS BAY OR
— 541-268 5XXX which blocks → QWEST CORPORATION 9638 MAPLETON OR
— 541-269 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 COOS BAY OR
— 541-270 8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 NEWPORT OR
— 541-271 7XXX8XXX which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 REEDSPORT OR
— 541-272 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 NEWPORT OR
— 541-273 not yet reported which blocks → QWEST CORPORATION 9638 KLAMATHFLS OR
— 541-276 not yet reported which blocks → QWEST CORPORATION 9638 PENDLETON OR
— 541-277 not yet reported which blocks → OREGON TEL. CORP. 2389 JUNTURA OR
— 541-278 not yet reported which blocks → QWEST CORPORATION 9638 PENDLETON OR
— 541-279 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 MADRAS OR
— 541-280 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 BEND OR
— 541-281 none assigned yet which blocks → UNITED STATES CELLULAR - OR 6349 KLAMATHFLS OR
— 541-282 3XXX4XXX which blocks → QWEST CORPORATION 9638 MEDFORD OR
— 541-284 not yet reported which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 EUGENE OR
— 541-285 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OR 7531 EUGENE 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.