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
2002-05-03 541-359 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 EUGENE OR
2002-05-03 541-368 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 CORVALLIS OR
2002-04-25 541-363 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KLAMATHFLS OR
2002-04-17 541-351 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 NEWPORT OR
2002-03-25 541-249 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 BAKER OR
2002-03-25 541-653 6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 EUGENE OR
2002-03-13 541-362 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 PRINEVILLE OR
2002-02-25 541-274 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 KLAMATHFLS OR
2002-02-25 541-306 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 BEND OR
2002-02-25 541-315 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 OAKLAND OR
2002-02-25 541-324 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 MEDFORD OR
2002-01-17 541-698 1XXX2XXX3XXX4XXX5XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 GOLD BEACH OR
2001-12-18 541-264 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 NEWPORT OR
2001-10-23 541-292 1XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 MEDFORD OR
2001-10-23 541-295 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 GRANTSPASS OR
2001-09-18 541-624 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 LA GRANDE OR
2001-08-17 541-288 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → METROPCS, INC. 5562 THE DALLES OR
2001-08-17 541-314 1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 HERMISTON OR
2001-08-17 541-705 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 THE DALLES OR
2001-08-17 541-716 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 HOOD RIVER OR
2001-06-18 541-238 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 KLAMATHFLS OR
2001-06-18 541-239 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 BAKER OR
2001-06-18 541-304 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 PENDLETON OR
2001-06-18 541-305 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 FLORENCE OR
2001-06-18 541-606 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 EUGENE OR
2001-05-16 541-303 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 HERMISTON OR
2001-05-08 541-437 not yet reported which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 ELGIN OR
2001-04-17 541-283 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 NEWPORT OR
2001-04-17 541-287 4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CAVE JCT OR
2001-03-22 541-212 0XXX2XXX4XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 ONTARIO OR
2001-03-22 541-228 2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 EUGENE OR
2001-03-22 541-244 0XXX1XXX7XXX8XXX · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 GRANTSPASS OR
2001-03-22 541-252 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 COOS BAY OR
2001-03-22 541-518 not yet reported which blocks → EAGLE TELEPHONE SYSTEM, INC. 5014 BAKER OR
2001-02-16 541-241 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7172 BEND OR
2001-02-16 541-540 not yet reported which blocks → EAGLE TELEPHONE SYSTEM, INC. 5014 RICHLAND OR
2001-02-16 541-661 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BROOKINGS OR
2001-02-16 541-662 3XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 REEDSPORT OR
2001-01-19 541-289 not yet reported which blocks → EASTERN OREGON TELECOM, LLC - OR 3955 HERMISTON OR
2001-01-19 541-297 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 COOS BAY OR
— 541-201 2XXX3XXX4XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9638 ASHLAND OR
— 541-202 not yet reported which blocks → COMMIO, LLC 939H MYRTLE CRK OR
— 541-205 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 KLAMATHFLS OR
— 541-206 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 EUGENE OR
— 541-207 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 CORVALLIS OR
— 541-210 4XXX5XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 MEDFORD OR
— 541-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OR
— 541-217 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → METROPCS, INC. 5562 COOS BAY OR
— 541-218 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 GRANTSPASS OR
— 541-219 3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 LAKEVIEW 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.